Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ukma!xanth!ames!killer!royf
From: royf@killer.DALLAS.TX.US (Roy Frederick)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Help needed adding drive types to PHOENIX BIOS
Summary: ROMU is just the ticket
Keywords: ibmpc phoenix bios
Message-ID: <7005@killer.DALLAS.TX.US>
Date: 2 Feb 89 03:46:40 GMT
References: <11416@ihlpa.ATT.COM>
Organization: The Unix(R) Connection, Dallas, Texas
Lines: 47

wolfordj@ihlpa.ATT.COM (452is-Wolford):
> 
> I am trying to add/replace a drive type in my PHONENIX BIOS v3.10 00.
> 

I used a public domain package called ROMU to update mine to support
a Fujitsu M2243 Drive (11 heads, 754 (?) cylinders).  The package consists
of a small program and a doc file.  The program copies your BIOS to a file,
displays the drive table, updates it, and calculates the checksum.  Not
neccessarily in that order!  I wrote a small program that compared a virgin
set of ROM images (odd and even separated) to a modified set.  Here are the
changes noted:

EVEN
-----
3309    00  <-  02
330b    00  <-  ff
330f    00  <-  02

ODD
-----
3308    00  <-  f2
3309    00  <-  0b
330b    00  <-  ff
330c    00  <-  08
330e    00  <-  f2
330f    00  <-  11
3fff    00  <-  f6 (checksum)

Then I took my chips out, copied them into memory of my programmer,
typed in the changes, programmed new chips, installed the new ones.
Voila!  It worked!  BTW, this was for drive type 35, I believe.
At any rate it was an unused type.  I also wrote a small C pgm to 
checksum a ROM in memory, mainly to determine the type of checksum 
used.

If you need it - this stuff is available - I think I can locate it all
- pack it - uuencode it - and mail it...  but maybe this is enough info
to do it without the little programs.

Good luck!


Roy Frederick (royf@killer.UUCP)
Dallas County Data Services  (214) 653-6340
504 Records Bldg.
Dallas, TX 75202