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pcjs/disks/pc/unix/microport/system-v/2.3
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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Jeff Parsons dbb77f31b6 Manifest updates
2015-06-01 15:47:52 -07:00
..
manifest.xml Manifest updates 2015-06-01 15:47:52 -07:00
README.md The great video config reorg 2015-05-18 21:02:37 -07:00
SYSTEMV23-DISK01.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK02.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK03.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK04.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK05.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK06.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK07.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK08.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK09.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK10.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK11.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK12.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK13.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK14.json More 80286 testing 2015-05-15 09:08:42 -07:00
SYSTEMV23-DISK15.json More 80286 testing 2015-05-15 09:08:42 -07:00

README.md

Debugging Notes

The boot sector contains the following code:

0000:7C3E B003 MOV AL,03 0000:7C40 B200 MOV DL,00 0000:7C42 B417 MOV AH,17 0000:7C44 CD13 INT 13 0000:7C46 72B8 JC 7C00

For BIOSes that don't support INT 0x13, AH function 0x17, patch the JC with two NOPs; eg:

e 0:7c46 90 90

After booting, the following code is executed:

12E8:01D3 52 PUSH DX ;history=5 12E8:01D4 51 PUSH CX ;history=4 12E8:01D5 2BC9 SUB CX,CX ;history=3 12E8:01D7 BA6400 MOV DX,0064 ;history=2 12E8:01DA ED IN AX,DX ;history=1

For virtual machines that don't support word I/O to port 0x64, patch IN AX,DX with IN AL,DX; eg:

e 12e8:1da ec