BIOS Updates forum

I've got a PC Chips M577 mainboard with an Award 4.51PG BIOS and a Symbios 53C815 SCSI adpater with the SDMS 4.02 BIOS. Recently, I decided to upgrade it with the new 4.12 version, which supports CD-ROM booting, so I burnt an EPROM with the new code, but it didn't work.

I tried plugging the SCSI card into another motherboard with an Award BIOS and it worked, so that made me see that the problem was in my mainboard BIOS, which has the old NCR 3.07 BIOS embedded. Since it's 128K, the BIOS hasn't enough room for the new SCSI code to put there, but I tried deleting the NCR BIOS with CBROM, but that made no difference.

Somehow the PnP BIOS extension doesn't recognize the new SCSI BIOS, so I think I have to patch the motherboard BIOS. Does anybody know the way can this be done?

Try removing the ROM from the SCSI controller and inserting its image into the system BIOS instead (using CBROM).

Do you have the latest M577 Bios ?
Tried to move the Controller to a different PCI Slot ?
Is your card not recognized at all or does it show up in windows ?
Tried boot order to SCSI first ?

reply to Rainbow:
if you read what I wrote, I tried to do so, but the new SCSI BIOS code is 32K and DOESN'T fit on my mother board BIOS

reply to Deniss:
I've got the lastest OFFICIAL BIOS. I haven't tried a custom patch yet, but I reported this problem to one of the authors for advice.
yes, I tried it on another solt. The SETUP boot order is SCSI,A, C.
no problem in Windows

Sorry
What BIOS do you have (date)? "Try 03/06/1999-M577+ITE8661-2A5LEH0AC-00" from http://wims.rainbow-software.org/. Try also with NCR ROM removed from the BIOS.

This is my current BIOS and I've already removed the NCR code.

So are you using the one from http://wims.rainbow-software.org or the official one ? There's a couple of differences, like support for big IDE drives and for K6-2+/III+ processors. Also, I think the NCR module in the M577 BIOS is used for IDE support.

I've finally found another BIOS for a similar motherboard that doesn't have this problem, but I need some tools to patch the PCI device numbers table (posted in the other forum)