Apple II character set - Revision history

Dan Tobias at 05:04, 10 June 2019

2019-06-10T05:04:29Z

Dan Tobias at 05:02, 10 June 2019

2019-06-10T05:02:46Z

Dan Tobias at 15:17, 1 June 2019

2019-06-01T15:17:54Z

Dan Tobias at 05:03, 22 May 2019

2019-05-22T05:03:19Z

Dan Tobias at 05:03, 22 May 2019

2019-05-22T05:03:06Z

Dan Tobias at 05:51, 21 May 2019

2019-05-21T05:51:27Z

Dan Tobias at 05:34, 21 May 2019

2019-05-21T05:34:10Z

Dan Tobias: Created page with "{{FormatInfo |formattype=electronic |subcat=Character encoding |released=1977 }} The '''Apple II character set''' was based on ASCII, but as with other small computers of ..."

2019-05-21T05:31:08Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Character encoding |released=1977 }} The '''Apple II character set''' was based on ASCII, but as with other small computers of ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Character encoding
|released=1977
}}
The '''Apple II character set''' was based on [[ASCII]], but as with other small computers of the day, it had a few platform-specific quirks.

It was a 7-bit character set, with the 8th bit used for other purposes in input and output such as denoting inverse video or keyboard buffering.

In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).

Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.

@@ Line 10: / Line 10: @@
 In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).
-Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and EOT / Ctrl-D (04) which signified that what followed was a DOS command. Also, Ctrl-Y (EM) was used in the assembly-language monitor (which the earliest Apples started up in; it was much less frequently encountered later on) to run a user-specified callback routine.
+Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and EOT / Ctrl-D (04) which signified that what followed was a DOS command. Also, Ctrl-Y / EM (19) was used in the assembly-language monitor (which the earliest Apples started up in; it was much less frequently encountered later on) to run a user-specified callback routine.
 Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.

@@ Line 10: / Line 10: @@
 In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).
-Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and EOT / Ctrl-D (04) which signified that what followed was a DOS command.
+Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and EOT / Ctrl-D (04) which signified that what followed was a DOS command. Also, Ctrl-Y (EM) was used in the assembly-language monitor (which the earliest Apples started up in; it was much less frequently encountered later on) to run a user-specified callback routine.
 Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.

@@ Line 10: / Line 10: @@
 In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).
-Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.
+Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and EOT / Ctrl-D (04) which signified that what followed was a DOS command.
 Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.

← Older revision		Revision as of 05:03, 22 May 2019
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	[[Category:Apple]]		[[Category:Apple]]
−	[[Category:Apple II]]	+	[[Category:Apple II series]]

← Older revision		Revision as of 05:03, 22 May 2019
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	Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.		Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.
		+
		+	[[Category:Apple]]
		+	[[Category:Apple II]]

← Older revision		Revision as of 05:51, 21 May 2019
Line 11:		Line 11:

	Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.		Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.
		+
		+	Since text displays on early Apples had 40 characters, any text files formatted for them would likely have line breaks before that point. Some programs used high-res graphics to display text characters in place of the standard Apple text mode, so they might have lowercase letters, different line widths, and special characters not in the standard character set.

← Older revision		Revision as of 05:34, 21 May 2019
Line 10:		Line 10:
	In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).		In the original Apple II models, only uppercase letters were used, with the lowercase letters displaying as punctuation from elsewhere in ASCII. Later models (starting with the IIe) had lowercase support (and there were third-party addons to add this capability to older Apples).

−	Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.	+	Early Apples had left and right arrows, with up and down arrows being added in later models. These keys mapped onto characters in the [[C0 controls]] range: BS (09) for left, NAK (15) for right, VT (0B) for up, and LF (0A) for down. Other control characters used in the Apple included CR (0D) used as a newline and ENTER character, BEL (07) which sounded the Apple speaker (the "G" key was marked "BELL" in the earliest Apples to suggest this use for Ctrl-G), and Ctrl-D (04) which signified that what followed was a DOS command.