Hello, > MSDOS.PRG is only the 6509 loader. I > tried to disassemble it, only got into first few bytes so far. I see > that it loads the 8088 code directly from disk sectors and puts into > RAM, then launches the 8088. Yes, it loads 54 sectors starting at Track 1 Sector 21 to memory bank 1 address 0. After reading sector 22 the next sector is sector 0 on the next track. So it loads IO.SYS at 10000 (6509) or 0000:0000 (8088) and MSDOS.SYS at 11800 (6509) or 0180:0000 (8088). > Then it contains lots of other stuff I had no time to disassemble, > probably all the IPC interface on the 6509 side. This stuff must do all the redirection of io access (keyboard, monitor and disc, ...). Greetings Martin Message was sent through the cbm-hackers mailing listReceived on 2011-01-19 05:00:08
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