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Warning: Cannot modify header information - headers already sent in /usr/local/www/mediawiki/includes/WebResponse.php on line 38 http://fileformats.archiveteam.org/index.php?action=history&feed=atom&title=IBM_PC_data_cassetteIBM PC data cassette - Revision history2024-12-28T05:56:20ZRevision history for this page on the wikiMediaWiki 1.19.2 Warning: require_once(): Unable to allocate memory for pool. in /usr/local/www/mediawiki/includes/normal/UtfNormal.php on line 193 http://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=33260&oldid=prevDan Tobias: /* References */2019-09-06T01:05:40Z<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://67.185.176.54:8080/ Mike's PCjr Page]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://67.185.176.54:8080/ Mike's PCjr Page]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.minuszerodegrees.net/manuals/IBM_5150_Technical_Reference_6322507_APR84.pdf IBM PC Technical Reference, 1984]: Pages 5-106 to 5-107</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.minuszerodegrees.net/manuals/IBM_5150_Technical_Reference_6322507_APR84.pdf IBM PC Technical Reference, 1984]: Pages 5-106 to 5-107</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [https://forum.winworldpc.com/discussion/11503/software-spotlight-cassette-software-for-the-ibm-pc Software spotlight: Cassette software for the IBM PC]</ins></div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=18652&oldid=prevDan Tobias at 23:18, 15 August 20142014-08-15T23:18:52Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The format consists of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. A tape record starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). This is followed by one or more 256-byte data blocks. Each data block is followed by a 2-byte [[CRC]], with the most significant byte first. After the last block, a 4-byte trailer is written of all 1 bits (hex FF).  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The format consists of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. A tape record starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). This is followed by one or more 256-byte data blocks. Each data block is followed by a 2-byte [[CRC]], with the most significant byte first. After the last block, a 4-byte trailer is written of all 1 bits (hex FF).  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>Tokenised BASIC programs and memory areas saved by IBM Cassette BASIC consist of two records: the first one is a header (always 256 bytes, of which the first 16 are significant), and the second one contains the data.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">[[GW-BASIC tokenized file|</ins>Tokenised BASIC<ins class="diffchange diffchange-inline">]] </ins>programs and memory areas saved by IBM Cassette BASIC consist of two records: the first one is a header (always 256 bytes, of which the first 16 are significant), and the second one contains the data.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>ASCII listings and data files consist of a sequence of 256-byte records; the first one is a header, as above, and subsequent ones contain the data. If the first byte of the record is 0, this is not the last record, and all 255 following bytes are valid data. Otherwise it gives the number of valid bytes in the last record, plus one.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>ASCII listings and data files consist of a sequence of 256-byte records; the first one is a header, as above, and subsequent ones contain the data. If the first byte of the record is 0, this is not the last record, and all 255 following bytes are valid data. Otherwise it gives the number of valid bytes in the last record, plus one.</div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=18651&oldid=prevJohn e: More detail on what the header flags mean2014-08-15T23:10:11Z<p>More detail on what the header flags mean</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The format consists of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. A tape record starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). This is followed by one or more 256-byte data blocks. Each data block is followed by a 2-byte [[CRC]], with the most significant byte first. After the last block, a 4-byte trailer is written of all 1 bits (hex FF).  </div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The format consists of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. A tape record starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). This is followed by one or more 256-byte data blocks. Each data block is followed by a 2-byte [[CRC]], with the most significant byte first. After the last block, a 4-byte trailer is written of all 1 bits (hex FF).  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del class="diffchange diffchange-inline">Files </del>saved by IBM Cassette BASIC consist of two records: the first one is a header (always 256 bytes, of which the first 16 are significant), and the second one contains the data.</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Tokenised BASIC programs and memory areas </ins>saved by IBM Cassette BASIC consist of two records: the first one is a header (always 256 bytes, of which the first 16 are significant), and the second one contains the data<ins class="diffchange diffchange-inline">.</ins></div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">ASCII listings and data files consist of a sequence of 256-byte records; the first one is a header, as above, and subsequent ones contain the data. If the first byte of the record is 0, this is not the last record, and all 255 following bytes are valid data. Otherwise it gives the number of valid bytes in the last record, plus one</ins>.</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The header layout is:</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>The header layout is:</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x01 || 8 bytes || Filename, ASCII</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x01 || 8 bytes || Filename, ASCII</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|0x09 || Byte || Flags<del class="diffchange diffchange-inline">. When </del>listing <del class="diffchange diffchange-inline">files</del>, BASIC <del class="diffchange diffchange-inline">displays '</del>P<del class="diffchange diffchange-inline">' if bit 5 is set</del>, <del class="diffchange diffchange-inline">'B' if bit 7 is set</del>, <del class="diffchange diffchange-inline">'A' if bit 6 is </del>set, <del class="diffchange diffchange-inline">'M' if bit 0 is set</del>, <del class="diffchange diffchange-inline">'D' otherwise.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|0x09 || Byte || Flags<ins class="diffchange diffchange-inline">:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">{| class="wikitable"</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Bit</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Meaning if set</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Example command to create</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|7 || Tokenised BASIC || <kbd>SAVE "file"</kbd></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|6 || ASCII </ins>listing <ins class="diffchange diffchange-inline">|| <kbd>SAVE "file"</ins>, <ins class="diffchange diffchange-inline">A</kbd></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|5 || Protected tokenised </ins>BASIC <ins class="diffchange diffchange-inline">|| <kbd>SAVE "file", </ins>P<ins class="diffchange diffchange-inline"></kbd></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0 || Memory area || <kbd>BSAVE "file"</ins>, <ins class="diffchange diffchange-inline">address</ins>, <ins class="diffchange diffchange-inline">length</kbd></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|No bits </ins>set <ins class="diffchange diffchange-inline">|| Data || <kbd>OPEN "O"</ins>,<ins class="diffchange diffchange-inline">1</ins>,<ins class="diffchange diffchange-inline">"file"</kbd></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x0A || Word || Number of bytes in the following data record (little-endian word)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x0A || Word || Number of bytes in the following data record (little-endian word)</div></td></tr>
</table>John ehttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=18649&oldid=prevJohn e at 10:08, 15 August 20142014-08-15T10:08:21Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x09 || Byte || Flags. When listing files, BASIC displays 'P' if bit 5 is set, 'B' if bit 7 is set, 'A' if bit 6 is set, 'M' if bit 0 is set, 'D' otherwise.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x09 || Byte || Flags. When listing files, BASIC displays 'P' if bit 5 is set, 'B' if bit 7 is set, 'A' if bit 6 is set, 'M' if bit 0 is set, 'D' otherwise.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>|0x0A || Word || Number of bytes in the following data <del class="diffchange diffchange-inline">part </del>(little-endian word)</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>|0x0A || Word || Number of bytes in the following data <ins class="diffchange diffchange-inline">record </ins>(little-endian word)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|-</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x0C || Word || Segment of load address (little-endian word)</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|0x0C || Word || Segment of load address (little-endian word)</div></td></tr>
</table>John ehttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=18648&oldid=prevJohn e: Added structure of BASIC header2014-08-15T10:07:33Z<p>Added structure of BASIC header</p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only the original IBM Personal Computer model 5150, and the later PCjr (intended as a low-end home computer), had this; other PCs did away with this feature which was rarely used on this platform given that just about everybody got their PC with at least one disk drive. Apparently, though, IBM felt that when they made their entry into the PC field (after years of regarding small computers as "toys" unworthy of their attention) they needed to be sure their machine duplicated all the features present in other brands of personal computers around at the time, and most of them had cassette interfaces then because disk drives had been so expensive in recent history (and those computers were aimed at home/hobby markets with limited budgets). By the time of the IBM PC, disk drives had come down in price, while IBM's computers were aimed at a more upscale business/professional market, so cassettes saw little use there.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only the original IBM Personal Computer model 5150, and the later PCjr (intended as a low-end home computer), had this; other PCs did away with this feature which was rarely used on this platform given that just about everybody got their PC with at least one disk drive. Apparently, though, IBM felt that when they made their entry into the PC field (after years of regarding small computers as "toys" unworthy of their attention) they needed to be sure their machine duplicated all the features present in other brands of personal computers around at the time, and most of them had cassette interfaces then because disk drives had been so expensive in recent history (and those computers were aimed at home/hobby markets with limited budgets). By the time of the IBM PC, disk drives had come down in price, while IBM's computers were aimed at a more upscale business/professional market, so cassettes saw little use there.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The format <del class="diffchange diffchange-inline">consisted </del>of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. <del class="diffchange diffchange-inline">The </del>tape starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). <del class="diffchange diffchange-inline">The number of bytes in the data follows (possibly; the references are rather unclear and don't say how many bits/bytes of length data there </del>is<del class="diffchange diffchange-inline">), </del>followed by <del class="diffchange diffchange-inline">the data itself, grouped into </del>256-byte blocks <del class="diffchange diffchange-inline">(each </del>followed by a 2-byte [[CRC]]).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The format <ins class="diffchange diffchange-inline">consists </ins>of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. <ins class="diffchange diffchange-inline">A </ins>tape <ins class="diffchange diffchange-inline">record </ins>starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). <ins class="diffchange diffchange-inline">This </ins>is followed by <ins class="diffchange diffchange-inline">one or more </ins>256-byte <ins class="diffchange diffchange-inline">data </ins>blocks<ins class="diffchange diffchange-inline">. Each data block is </ins>followed by a 2-byte [[CRC]]<ins class="diffchange diffchange-inline">, with the most significant byte first. After the last block, a 4-byte trailer is written of all 1 bits (hex FF</ins>).  </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">Files saved by IBM Cassette BASIC consist of two records: the first one is a header (always 256 bytes, of which the first 16 are significant), and the second one contains the data.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">The header layout is:</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">{| class="wikitable"</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Offset</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Size</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">! Description</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x00 || Byte || Always 0xA5 </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x01 || 8 bytes || Filename, ASCII</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x09 || Byte || Flags. When listing files, BASIC displays 'P' if bit 5 is set, 'B' if bit 7 is set, 'A' if bit 6 is set, 'M' if bit 0 is set, 'D' otherwise.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x0A || Word || Number of bytes in the following data part (little-endian word)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x0C || Word || Segment of load address (little-endian word)</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|-</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|0x0E || Word || Offset of load address  (little-endian word) </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins class="diffchange diffchange-inline">|}</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://67.185.176.54:8080/ Mike's PCjr Page]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://67.185.176.54:8080/ Mike's PCjr Page]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [http://www.minuszerodegrees.net/manuals/IBM_5150_Technical_Reference_6322507_APR84.pdf IBM PC Technical Reference, 1984]: Pages 5-106 to 5-107</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td></tr>
</table>John ehttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=16609&oldid=prevDan Tobias: /* References */2014-03-11T22:05:59Z<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">* [http://67.185.176.54:8080/ Mike's PCjr Page]</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>[[Category:IBM]]</div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=15623&oldid=prevDan Tobias at 20:44, 7 January 20142014-01-07T20:44:11Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1981</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>|released=1981</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>}}</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only the original IBM Personal Computer model 5150, and the later PCjr (intended as a low-end home computer), had this; other PCs did away with this feature which was rarely used on this platform given that just about everybody got their PC with at least one disk drive. Apparently, though, IBM felt that when they made their entry into the PC field (after years of regarding small computers as "toys" unworthy of their attention) they needed to be sure their machine duplicated all the features present in other brands of personal computers around at the time, and most of them had cassette interfaces then because disk drives had been so expensive in recent history (and those computers were aimed at home/hobby markets with limited budgets). By the time of the IBM PC, disk drives had come down in price, while IBM's computers were aimed at a more upscale business/professional market, so cassettes saw little use there.</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only the original IBM Personal Computer model 5150, and the later PCjr (intended as a low-end home computer), had this; other PCs did away with this feature which was rarely used on this platform given that just about everybody got their PC with at least one disk drive. Apparently, though, IBM felt that when they made their entry into the PC field (after years of regarding small computers as "toys" unworthy of their attention) they needed to be sure their machine duplicated all the features present in other brands of personal computers around at the time, and most of them had cassette interfaces then because disk drives had been so expensive in recent history (and those computers were aimed at home/hobby markets with limited budgets). By the time of the IBM PC, disk drives had come down in price, while IBM's computers were aimed at a more upscale business/professional market, so cassettes saw little use there.</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>The format consisted of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. The tape starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). The number of bytes in the data follows, followed by the data itself, grouped into 256-byte blocks (each followed by a 2-byte [[CRC]]).</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>The format consisted of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. The tape starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). The number of bytes in the data follows <ins class="diffchange diffchange-inline">(possibly; the references are rather unclear and don't say how many bits/bytes of length data there is)</ins>, followed by the data itself, grouped into 256-byte blocks (each followed by a 2-byte [[CRC]]).</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>== References ==</div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=9757&oldid=prevDan Tobias at 17:03, 16 February 20132013-02-16T17:03:39Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape|Wikipedia article]]</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">[[Category:IBM]]</ins></div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=9111&oldid=prevDan Tobias: /* References */2013-01-20T05:47:10Z<p><span dir="auto"><span class="autocomment">References</span></span></p>
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<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.brutman.com/Cassette_Waveforms/Cassette_Waveforms.html Reading IBM PC and PCjr Cassette Waveforms]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.brutman.com/Cassette_Waveforms/Cassette_Waveforms.html Reading IBM PC and PCjr Cassette Waveforms]</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td><td class='diff-marker'> </td><td style="background: #eee; color:black; font-size: smaller;"><div>* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="background: #ffa; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape Wikipedia article]]</div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div>* [[Wikipedia:IBM cassette tape<ins class="diffchange diffchange-inline">|</ins>Wikipedia article]]</div></td></tr>
</table>Dan Tobiashttp://fileformats.archiveteam.org/index.php?title=IBM_PC_data_cassette&diff=9110&oldid=prevDan Tobias: Created page with "{{FormatInfo |formattype=physical |subcat=Magnetic tape |subcat2=Audio Cassette |released=1981 }} Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only ..."2013-01-20T05:43:08Z<p>Created page with "{{FormatInfo |formattype=physical |subcat=Magnetic tape |subcat2=Audio Cassette |released=1981 }} Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only ..."</p>
<p><b>New page</b></p><div>{{FormatInfo<br />
|formattype=physical<br />
|subcat=Magnetic tape<br />
|subcat2=Audio Cassette<br />
|released=1981<br />
}}<br />
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Yes, the '''IBM PC''' did have a cassette port at one point. Actually, only the original IBM Personal Computer model 5150, and the later PCjr (intended as a low-end home computer), had this; other PCs did away with this feature which was rarely used on this platform given that just about everybody got their PC with at least one disk drive. Apparently, though, IBM felt that when they made their entry into the PC field (after years of regarding small computers as "toys" unworthy of their attention) they needed to be sure their machine duplicated all the features present in other brands of personal computers around at the time, and most of them had cassette interfaces then because disk drives had been so expensive in recent history (and those computers were aimed at home/hobby markets with limited budgets). By the time of the IBM PC, disk drives had come down in price, while IBM's computers were aimed at a more upscale business/professional market, so cassettes saw little use there.<br />
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The format consisted of 1-millisecond-long pulses for each 1 bit, and 0.5-millisecond pulses for each 0 bit. The tape starts with a leader of 256 bytes of all 1 bits (hex FF), followed by a single synchronization bit (0), and then a synchronization byte (hex 16, the [[ASCII]] character from the [[C0 controls]] designated as SYN). The number of bytes in the data follows, followed by the data itself, grouped into 256-byte blocks (each followed by a 2-byte [[CRC]]).<br />
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== References ==<br />
* [http://www.brutman.com/Cassette_Waveforms/Cassette_Waveforms.html Reading IBM PC and PCjr Cassette Waveforms]<br />
* [http://www.vintage-computer.com/vcforum/showthread.php?8829-IBM-PC-Cassette-interface Discussion of IBM PC cassette interface]<br />
* [[Wikipedia:IBM cassette tape Wikipedia article]]</div>Dan Tobias