Hallo Spiro, > cmp #$E5 ; ??? I found out later as well, see the subroutine Scratch. > lda (DirPointer),Y ; ??? [FB] I simply forgot to remove it. But thanks any way for your comment !!! I still don't know if MS-DOS FAT12 is used. So far I haven't found any hard proof for it. What is quite disturbing is that the program uses a lot of those "TapeBuffer+xx" variables. And some are used in more than one way. But the most important thing is that I understand how the FDC is programmed. The rest is a matter of using your own programmer's fantasy. I'm familiar with handling FAT12; I started to write my own little OS. But later I started to use my own file system and parked it for the moment. If interested, I can send the sources so you can see how FAT 12 is handled. I have three UM8397s laying around which only need two 7406 ICs plus a 4 Mhz oscilator to be able to function. That is, for a PC=XT. for any Commodore we need at least some thing to create the IOW and IOR signal from PHI2 and IOx. One halve of a 74LS139 would do. What could be done as well is to create a simple ISA bus interface, targeted on I/O only. And only trgetting the 3xxh range would mean that IMHO one halve of a 74LS139 is enough. -- Kind regards / Met vriendelijke groet, Ruud Baltissen www.Baltissen.orgReceived on 2018-11-29 18:00:08
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