Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!att!laidbak!obdient!ddsw1!ddsw1!point!wek
From: wek@point.UUCP (Bill Kuykendall)
Newsgroups: comp.sys.ibm.pc
Subject: IBM-AT BIOS ROMS
Message-ID: <[2058.1]comp.ibmpc;1@point.UUCP>
Date: 20 Sep 89 19:00:07 GMT
References: <1989Sep19.021545.8110@NCoast.ORG>
Lines: 17

>in the BIOS tables (only 14 are in the tables).  I prefer not to use
>a TSR such as Disk Manager.  Fortunately (or unfortunately) I have a

Huh?  DM isn't a TSR, but it doesn't cover miniscribes so it won't help
anyway.

>geometry tables.  It is therefore possible for me to copy my BIOS ROMS
>into 27128 EPROMS and alter one of the existing disk types.  Unfortunately,
>I suspect that the BIOS does a checksum on the BIOS ROMS, but cannot
>find where it is being done or where the checksum is being performed.
>Is there anyone out there who has any information on how this is being
>done?  I have already found the code where the system performs checksums

Any prom burner worth it's salt will do the checksum for you.  I wouldn't
waste the time fooling with it though.  You can buy a Phoenix bios with all
the bells & whistles including in-rom setup for $14 from a dozen different
mail order houses advertised in almost any PC publication.