Hi Don't remember how but there is a way to load and execute code for the second 6502 used has fdc it was used by a software named "Silicon Office" to protect their floppy disk... the company I was working for Procep (selling commodore in france) asked me to write a program to copy their disks... I forgot the details but I just remember that I had do upload code for the second 6502... you probably need the source code of the DOS and analyse the dialog between both processors they have a shared memory (the program has to be placed in this memory) -- didier Le 11/01/2024 à 12:55, Michal Pleban a écrit : > Hi! > > Baltissen, GJPAA (Ruud) wrote on 10.01.2024 14:44: > >> Regarding formatting a disk, the software, that is executed by the >> 2nd 6502 (FDC controller), can be found in the ROM of the first 6502, >> the bus controller. The 1541 uses the same principal so you could >> start with studying that one first. Main advantage: everything in one >> ROM. > > Well, I guess then my specific question is: how do I execute code on > the second CPU? When I send a "Memory-execute" or "user" command to > the drive, it is being executed on the first CPU, correct? With the > 1541, when everything is run on the same CPU, you can surely execute > drive-interfacing code this way, but how to do it when there are two > CPUs involved and only the DOS-CPU is user-facing? > > Regards, > Michau. > >Received on 2024-01-11 21:00:04
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