brian@chemo.uucp (Brian J. McGinness) (05/28/87)
wjr@rayssd.RAY.COM asked if there is a way to view the BIOS ROMS without pulling them out of the machine. Use debug! In the XT the roms live at F000:6000 through F000:FFFF. The boot location is F000:E000. The stuff below that is casette basic. On the AT, the ROMs are interleaved (even bits in one ROM, odd bits in the other) but debug will still read the info correctly, the interleaving is in the hardware scheme. If you want to save the info (for backup purposes of course!) you have to manually set up the PSP in debug using the "n" (name) command, the "r" command to put the file legnth in BX:CX, then use the "w" command to write the file to dis sm