On 1/9/2023 6:47 PM, Rob Clarke wrote: > > Hi all, > > Small question on JiffyDOS versions. I recently acquired a 1581 that > came with JiffyDOS installed whch was labelled as v6.01. I had read > from the CMD JD literature that that JD included all the Commodore > firmware patches from the latest available ROM version at the time. > > After poking around in the ROM. it seems that this 1581 JD ROM does > not include the SEI patch that Commodore released with the 318045-02 > ROM which disabled interrupts when processing the command queue. > There's only 8 bytes difference between the -01 and -02 official ROMS, > 3 bytes to jump to the patch code, 4 bytes for the patch code, and one > byte to disable the ROM checksum check at /RESET. Details below. > > Can anyone familiar with JD versions confirm that the 1581 JD ROM did > not include Commodore's patch? > > Differences below. > > > 318045-01 318045-02 Jiffy 601 > AF8C 3A 00 3A > C160 6C 4C 6C > C161 48 AF 48 > C162 00 C5 00 > C5AF FF 78 FF > C5B0 FF 6C FF > C5B1 FF 48 FF > C5B2 FF 00 FF > > Rob > I wonder if the patch was unneeded on JD? Have you tried JD with the patch? Jim -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2023-01-11 03:00:01
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