MihaiPopa7 at 12:48, 8 September 2024

2024-09-08T12:48:02Z

Parchivist: Created page with "{{FormatInfo |subcat=Error detection and correction |released=1982 }} '''SWAT (Strategic Weapon Against Typos)''' by Jon Voskuil and Alan J Zett is a type-in program checker f..."

2024-09-08T05:33:34Z

Created page with "{{FormatInfo |subcat=Error detection and correction |released=1982 }} '''SWAT (Strategic Weapon Against Typos)''' by Jon Voskuil and Alan J Zett is a type-in program checker f..."

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{{FormatInfo
|subcat=Error detection and correction
|released=1982
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'''SWAT (Strategic Weapon Against Typos)''' by Jon Voskuil and Alan J Zett is a type-in program checker for Apple II, Atari and TRS-80 used by SoftSide magazine.

It generates a table with three columns: a range of line numbers, a two-letter 'SWAT Code', and the length (in bytes) of the specified program lines.

This narrows the area of a bug to no more than twelve lines or no mroe than about 500-700 bytes of code.

The 'resolution' of SWAT can be increased for particularly error-prone code. For instance, change "NU=12: B=500" to "NU=5: B=200" to provide a checksum for every 5 lines or 200 bytes of code.

The SWAT Code is generated by adding up the value of every byte in a chunk and then converting to a base-26 number. Just the two rightmost 'digits' (letters) are used. This approach leaves it vulnerable to transposition errors.

== Sample Output ==
[[File:swat.gif]] SWAT

[[File:swat-modified parameters.jpg]] SWAT with modified parameters

== Links ==
* [https://archive.org/details/softside-magazine-45/page/n47/mode/2up SWAT code listing and article] (from SoftSide Issue 30 pg 46)
* [https://www.atarimania.com/documents/Best-of-SoftSide-Atari-Edition.pdf Updated Atari version] (Best of SoftSide Atari Edition pg 139)
* [https://bumbershootsoft.wordpress.com/2019/01/14/dissecting-three-classic-automatic-proofreaders/ Dissecting Three Classic Automatic Proofreaders]

@@ Line 7: / Line 7: @@
 It generates a table with three columns: a range of line numbers, a two-letter 'SWAT Code', and the length (in bytes) of the specified program lines.
-This narrows the area of a bug to no more than twelve lines or no mroe than about 500-700 bytes of code.
+This narrows the area of a bug to no more than twelve lines or no more than about 500-700 bytes of code.
 The 'resolution' of SWAT can be increased for particularly error-prone code. For instance, change "NU=12: B=500" to "NU=5: B=200" to provide a checksum for every 5 lines or 200 bytes of code.

SWAT (Strategic Weapon Against Typos) - Revision history

MihaiPopa7 at 12:48, 8 September 2024

Parchivist: Created page with "{{FormatInfo |subcat=Error detection and correction |released=1982 }} '''SWAT (Strategic Weapon Against Typos)''' by Jon Voskuil and Alan J Zett is a type-in program checker f..."