Path: utzoo!utgpu!water!watmath!clyde!att!chinet!mcdchg!wucs1!plus5!zippy!dale
From: dale@zippy.wustl.edu (Dale Frye)
Newsgroups: comp.sys.ibm.pc
Subject: Re: What kind of ROM? (WAS: IBM ROM BIOS upgrade kit
Summary: Here's the part number you need!!!
Keywords: ibm pc rom bios upgrade kit
Message-ID: <220@zippy.wustl.edu>
Date: 18 Aug 88 21:25:01 GMT
References: <927@orion.cf.uci.edu> <5962@dasys1.UUCP> <11872@steinmetz.ge.com>
Distribution: na
Organization: Washington University, St. Louis, MO
Lines: 15


The EPROM to use is Mototola MCM68766.
I bought some from Hamilton-Avnet.  Cost about $5 - $10 each.

This is a 24 pin EPROM. Most 8K EPROMS are 28 pin.

1: Don't copy the XT BIOS. It won't work in the PC.
2: Only the BIOS needs to be copied. It is the ROM on the extreme right
looking in from the front of the machine. The other ROMS are for BASIC.
3: Some PROM programmers may not be able to read the original ROM.
The chip select pin of the rom must be strobed with each data access.
Many burners don't do this. I had to write a little program to read the
ROM in the machine and send the data over to the burner.

Dale Frye @ Washington University