> > > Now, let's apply this theory to our 8088 case... After careful > > isolation, I was able to determine that memory is corrupted after > > this call: > > > > 0040:0674 call far ptr 0F000h:0F003h > > > > Which is, of course, a call to IPC. Until then, no 8088 code is > > executed from memory locations 0xxx21h nor 0xxxA1h. > > Okay, now we know the programm code that corrupt the data. > > > But in the ROM code at 0F000h:0F003... yes, we have an instruction at > > location 0FF021h, and guess what it is? > > > > F000:F021 in al,21h > > > > Now that's a coincidence - an instruction at location 21 which > > accesses port 21! > Is there a wedge that could be written/run before loading MS DOS to bypass this problem? Bill Message was sent through the cbm-hackers mailing listReceived on 2011-01-28 18:00:25
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