Chexsum
From Just Solve the File Format Problem
(Difference between revisions)
Parchivist (Talk | contribs) (Created page with "{{FormatInfo |subcat=Error detection and correction |released=1983 }} '''Chexsum''' is a type-in program checker for the Commodore 64 and 16, Amstrad CPC 464 and 664, Atari 13...") |
Parchivist (Talk | contribs) |
||
| (One intermediate revision by one user not shown) | |||
| Line 5: | Line 5: | ||
'''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. | '''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. | + | 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 ':' if they fall on certain positions in a program line. | + | 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. | There are different versions in each book. | ||
| Line 17: | Line 17: | ||
== Links == | == Links == | ||
| + | * [https://www.youtube.com/watch?v=uMzgK8J6pjI 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 | ||
* [https://archive.org/details/commodore-64-games-book/page/n13/mode/2up Commodore 64 Games Book pg 4] ([https://github.com/OldSkoolCoder/Melbourne-House-Commodore-64-Games-Book/tree/master/Book alternate source]) | * [https://archive.org/details/commodore-64-games-book/page/n13/mode/2up Commodore 64 Games Book pg 4] ([https://github.com/OldSkoolCoder/Melbourne-House-Commodore-64-Games-Book/tree/master/Book alternate source]) | ||
* [https://archive.org/details/commodore-64-games-book-2/page/n13/mode/2up Commodore 64 Games Book 2 pg 7] ([https://github.com/OldSkoolCoder/Melbourne-House-Commodore-64-Games-Book-2/tree/master/Book alternate source]) | * [https://archive.org/details/commodore-64-games-book-2/page/n13/mode/2up Commodore 64 Games Book 2 pg 7] ([https://github.com/OldSkoolCoder/Melbourne-House-Commodore-64-Games-Book-2/tree/master/Book alternate source]) | ||
| Line 24: | Line 25: | ||
* [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] | ||
| − | * [https://archive.org/details/writing-adventure-games-on-the-amstrad-mike-lewis-simon-price-1985acme/page/154/mode/2up Writing Adventure Games on the Amstrad pg 155] | + | * [https://archive.org/details/writing-adventure-games-on-the-amstrad-mike-lewis-simon-price-1985acme/page/154/mode/2up Writing Adventure Games on the Amstrad pg 155] ([http://people.cs.bris.ac.uk/~ecsnp/games/Writing%20Adventure%20Games%20on%20the%20Amstrad.pdf alternate source]) |
| − | * [https://archive.org/details/Atari_130XE_Games_Book/page/n11/mode/2up Atari 130XE Games Book pg 3] | + | * [https://archive.org/details/Atari_130XE_Games_Book/page/n11/mode/2up Atari 130XE Games Book pg 3] ([https://www.atarimania.com/documents/Atari_130XE_Games_Book.pdf alternate source]) |
| + | ** [http://atarionline.pl/v01/utils2.php?ct=utils2&sub=9.%20Rozne&title=+Atari+130+XE+Games+Book&file=Atari+130+XE+Games+Book.atr .ATR file] ([http://atarionline.pl/v01/index.php?ct=utils2&sub=9.%20Rozne source page]) | ||
Latest revision as of 02:04, 16 April 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
- C16 PRG file
- 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)
