Retro/pcjs
Watch
1
0
Fork
You've already forked pcjs
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

More README cleanup

Browse source
This commit is contained in:
Jeff Parsons 2016-05-19 20:10:09 -07:00
commit ab1d25c289
55 changed files with 1090 additions and 335 deletions
Download patch file Download diff file Expand all files Collapse all files

6
devices/pcx86/rom/README.md
View file

@ -3,8 +3,10 @@ layout: page
title: IBM PC ROMs
permalink: /devices/pcx86/rom/
redirect_from:
- /devices/pc/bios/
- /devices/pc/rom/
- /devices/pc/bios/
- /devices/pcx86/rom/5150/
- /devices/pcx86/rom/5160/
---
IBM PC ROMs
@ -39,7 +41,7 @@ The project contains the following IBM PC BIOS ROMs:
As hinted above, some newer Model 5150 machines with the **Oct 27, 1982** BIOS included IBM BASIC C1.10. And
some even *newer* 5150 machines had a BIOS with a "1982" copyright year instead of "1981", which also changed the checksum
byte from 0x78 to 0x77. However, the project includes only the original "1981" version, since the difference was trivial.
byte from 0x78 to 0x77. However, the project includes only the original "1981" version, since the difference is trivial.
In general, IBM BASIC ROM images are 32Kb and IBM BIOS ROM images are 8Kb, and together they provide 40Kb of contiguous
read-only memory, with the BASIC ROM spanning physical addresses 0xF6000-0xFDFFF and the BIOS ROM spanning addresses