View source for RUN's Checksum

{{FormatInfo
|subcat=Error detection and correction
|released=1988
}}
'''RUN's Checksum''' by Bob Kodadek is a type-in program checker for Commodore C-64 and C-128 used by Run magazine that replaced [[Perfect Typist]].

When you type in a program, a checksum from 0 to 255 will appear below the line on the left margin.

The line is checked only after it has been crunched by Basic. This allows PRINT and ? to give the same checksum value. If long lines require Basic keywords to be abbreviated, the checksum value will still be correct. Spaces matter only if they are within quotes. Transposition errors are caught

While the output looks the same as [[Perfect Typist]], the checksums are not compatible. RUN's Checksum updated the algorithm to ensure that every byte of data entered has a unique value, depending on its position in the line.


== Links ==
* [https://archive.org/details/run-magazine-49/page/n81/mode/2up RUN's Checksum] (Run Jan 1988 pg 80)
* [https://archive.org/details/run-magazine-rerun-disks RUN's Checksum in .d64 format] ([https://discmaster.textfiles.com/browse/7134/rerun-1988-01-02.d64 alternate source])