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Starting work on disambiguating PCjs the emulator from PCjs the project/website; the emulator will become PCx86

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This commit is contained in:
Jeff Parsons 2016-05-16 20:53:57 -07:00
commit 288f28055d
1519 changed files with 16242 additions and 6939 deletions
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34
disks/pc/unix/microport/system-v/2.3/README.md
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---
layout: page
title: Microport UNIX System V-AT 2.3
permalink: /disks/pc/unix/microport/system-v/2.3/
---
Microport's AT&T UNIX System V-AT 2.3
---
### 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