Chexsum
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* [https://archive.org/details/Machine_Language_for_the_Absolute_Beginner_1984_Melbourne_House/page/n181/mode/2up?q=chexsum Commodore 64 Machine Language for the Absolute Beginner pg 176] | * [https://archive.org/details/Machine_Language_for_the_Absolute_Beginner_1984_Melbourne_House/page/n181/mode/2up?q=chexsum Commodore 64 Machine Language for the Absolute Beginner pg 176] | ||
* [https://archive.org/details/commodore-16-games-book/page/8/mode/2up Commodore 16 Games Book pg 16] | * [https://archive.org/details/commodore-16-games-book/page/8/mode/2up Commodore 16 Games Book pg 16] | ||
| − | * [https://plus4world.powweb.com/software/Chexsum C16 PRG file] | + | ** [https://plus4world.powweb.com/software/Chexsum C16 PRG file] |
* [https://archive.org/details/msxgamesbookandrewlaceyfoundpage56andaddedhere/page/n9/mode/2up MSX Games Book pg 6] | * [https://archive.org/details/msxgamesbookandrewlaceyfoundpage56andaddedhere/page/n9/mode/2up MSX Games Book pg 6] | ||
* [https://archive.org/details/amstrad-games-book-cpc-464-664-kevin-bergin-andrew-laceyacme/page/2/mode/2up Amstrad Games Book pg 3] | * [https://archive.org/details/amstrad-games-book-cpc-464-664-kevin-bergin-andrew-laceyacme/page/2/mode/2up Amstrad Games Book pg 3] | ||
Latest revision as of 06:37, 28 May 2026
Chexsum is a type-in program checker for the Commodore 64 and 16, Amstrad CPC 464 and 664, Atari 130XE, and MSX used by Melbourne House Publishers.
It displays a four-digit checksum for each entered line based on the tokenized BASIC, so it ignores extraneous spaces, REM statements, etc.
It can sometimes see a '.' as a ',' and a ';' as a ':' or even a '9' as a ')' if they fall on certain positions in a program line.
There are different versions in each book.
[edit] Sample Output
[edit] Links
- Let's Type Castle of Doom (1983) – The Strangest C64 Game I've Typed In - demonstration of the program in use at 2:12 and 8:25, also a mod to make it automatically pause every 10 lines
- Commodore 64 Games Book pg 4 (alternate source)
- Commodore 64 Games Book 2 pg 7 (alternate source)
- Commodore 64 Machine Language for the Absolute Beginner pg 176
- Commodore 16 Games Book pg 16
- MSX Games Book pg 6
- Amstrad Games Book pg 3
- Writing Adventure Games on the Amstrad pg 155 (alternate source)
- Atari 130XE Games Book pg 3 (alternate source)
