checksum error means either dump is bad or flash was unsuccessful/incomplete

The AMI BIOSes probably have the same problem, it's just that those usually don't even display anything if the BIOS checksum is wrong. So yeah, either the dumps are not correct or there was a problem with the flash.

EDIT: MODBIN doesn't complain when trying to open the AWARD files, so I'd say they're probably OK. So it looks like either a problem during the flashing process or something is not right with the chip.

Updated my TL866 software and firmware. Tried 2 different Winbond EEPROMs. Both show no errors. Does it look like my settings are correct? Getting Code 13 10 on the post analyzer with no video.

Not that it would make any difference, but I've noticed you selected W29EE011 @PLCC32. From the first picture I can tell you are using a regular DIP chip, so you should choose the plain W29EE011. Again, both should work but just to discard any quirks of the TL866 software I suggest choosing the appropriate option for your chip.

The codes 13 10, is that with AMI or Award?

Tried switching to plain W29EE011 - no luck. The 13 10 is when using AMI. When using Award it gives the same screenshot I put up that shows 'BIOS ROM checksum error', then 1 short 1 long beep. Code: 41 0d

Yes you should not choose the wrong pinout/pincount on a EEPROM when trying to flash.
Go here: http://web.archive.org/web/19970707123816/htt … 6/4144/4144.htm
grab the Award bios directly and try again.

Correct pinout/pincount was selected this time. I tried both AMI and AWARD from the link above on Archive.org. (Thank you!)

Here are the results of each - still no workie:

https://youtube.com/shorts/btv0UOck9Co?feature=share <--AMI

https://youtube.com/shorts/_2m9VQgdhLk?feature=share <--AWARD

wait, first you got post screen with error, now you get no screen at all and boot loops? take off cache, downclock cpu, change ram, change cpu etc

The AMI BIOS code where it gets stuck (18) seems to be related to memory refresh test, but I can’t tell for sure without knowing exactly what BIOS core that is.

Can you post a close picture of the memory modules you’re using? Since it’s a 486 I would test with the following:

• Definitely use FPM: even though some revisions of the SIS chipset support EDO it’s not always compatible
• Populate only 1 memory bank (SIMM1 slot)
• Use single-sided modules if possible

YES!! Thanks to everyone! It was the FP RAM vs EDO.

By the way, either BIOS works, both Award and AMI!!

Great ! Glad you got it working.

Thanks! Its now setup for a Duke3d LAN party for this weekend.