acl wrote on 2022-05-11, 09:53:
I got my two ram sticks for 10€. And i consider that i overpaid them, since there are a lot of EDO/SDR sticks for much less. But these were 60ns and the chips were 20 pins and the datasheet looked like it could be compatible. So i will give it a try. This will probably be visually ugly if i succeed.
Prices for 72 pin SIMMs are ridiculous anyway, compared to the size. But for around ten bucks, one should get 16 to 32 MB als BIN and most are 60 ns.
But, more importantly, I don't know much about ICs and maybe I'm missing something, but those chips are 1M x 4, not 256k x 4, so how are they supposed to work on that card? Will it just ignore the other 768k?
You seem to be a bit SOL with that particular card, as DIP20 on a PCI card are a bit of an anachronism. Most had DIL40 with 512 KB by then, which are standard in 60 ns.
DIP20 1MBit chips, however, are being sold mostly in 70, 80 or even 100 and 120 ns.
60 ns are rare, so they come at some premium.
You shouldn't expect ebay offers to include the access time in the title. Ebay just isn't that kind of place. There are places that do that kind of thing and include a link to a pdf data sheet in the listing.
- But those either sell you a thousand chips for 500 € or one for 50.
Broader search, I found this:
https://www.ebay.de/itm/222116867106
So, almost 6 € a piece plus shipping from the UK. Still an outrage. I got a set of eight once, pretty sure I didn't pay more than ten for that, albeit 70 ns ones.
I get that you'd like to get the same speed as are on there, on principle. But there are quite a few pics out there with that chip and 70 ns RAM:
https://www.vgamuseum.info/index.php/charts/i … 2-ati-mach64-ct
I think it would be fine with 70 ns, but maybe someone knows more about that.