VOGONS


NEC 486 Chipset

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Reply 20 of 21, by gonzobizarro

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mcfly wrote on 2018-08-07, 19:09:

Just in case I am uploading my BIOS, I suspect the image is corrupted and working copy would be nice to compare. Unless of course somebody know how to identify parts from this cryptic ascii arts 😀

Hi! Just wanted to thank you for attaching the BIOS dump. I managed to get one of these boards, but it had some random EEPROM chip inserted (completely unrelated contents) by previous owner. I tried yours and the board works fine! Whatever issue you've had with yours, must be related to something else on the board - the BIOS seems OK!
I'll request the BIOS file gets added to RetroWeb's entry on this rare mobo, unless you want to do it yourself (as you are the real source!)?

Reply 21 of 21, by rasz_pl

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Nice necro!

Wow what a weird board. Bios is "Phoenix NuBIOS Version 4.04" dated 09/05/96. Thats two years pre Award Software merger. I havent seen any pure Phoenix bioses before, gonna have some fun with this one.
btw Bios is 64KB only, half the dump is empty and redundant.

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/440BX Reference Design adapted to Kicad