Luckily for you I was just messing with this machine again and still have notifications on this topic! Hope that's clear enough for you.

So I took a punt on some cheap eBay cache chips, fully expecting they might not be up to spec. Of the ten, nine checked out OK in a simple USB programmer/memory tester, which agrees with the commonly quoted 10% DOA rate but also confirms they are at least RAM of some description. They however don't …

Paar wrote on 2020-03-16, 14:28: Bought them from here Ah, EEPROMs! Thanks, I was only searching for Flash. Can't go wrong at those prices so I have some W27C512 coming my way too. My Franken-chip will do fine until then.

Paar wrote on 2020-03-16, 12:42: I bought some DIP28 chips on eBay, it seemed there are plenty of them. Or could you use a site such as buyicnow. Got part numbers? I figured I'd experiment with this setup and burn an EPROM when I'm sure it doesn't need more tweaking. Flash is a whole lot more …

A pin-compatible flash chip would have been ideal to experiment with but I've had no luck finding 64K x 8 in anything other than DIP-32. Turns out you can use a DIP-32 chip too, at least some of them. The PCB has holes for it but only a 28-pin socket. The "top" four holes are wired up like this, …

You need UV light to erase that chip. Either you have specialized device that will erase within a an hour or so, or you could leave it outside for a week so a sun shines directly on it. Once it's erased you can program it however you want. Yeah, I have neither the equipment nor the sunlight here :D …

I think I stumbled upon your site, actually that page, looking for more info on mine. I'm running this at 33 MHz and still wrapping my head around the wait states, looks like I can't get any lower than 2. This afternoon I finally traced out the PAL and popped it into my "logic analyzer" :D …

Very interesting! I have the same board with VBS 1.06 dated 01/11/95 but the dump is slightly different. Only by a few bytes, and a lot of that's text, so I'm not sure it's significant. Did you upload the original or was this already modbin-ned? I'm also looking for a BIOS update, mainly because …

BIOS image for this card COLORImage Tseng ET4000/W32i VLB Trident Computer, Inc. FCC-ID: KAZET4W32VLBUS link to file MD5: ec62c3325fafbad3c1ef04e8aa2365ae

This card turned up on that well-know auction site whilst looking for parts for a 486 build. As I could find very little about it online, I thought I’d post my discoveries here. Maybe folks here have more information or other insights. et4w32vlbus.jpg That delightfully skewed and off-center heatsink …