What did ATi pull out of the card when they made the 109-23400-00 \ VOGONS

What did ATi pull out of the card when they made the 109-23400-00

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First post, by douglar

Posted on 2025-03-04, 19:52

douglar Offline

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The first generation of ATi VLB Mach32 cards had a set of 8 buffer/driver chips between the Mach32 chip and the VLB connector:
https://theretroweb.com/expansioncards/s/ati- … ch-32-vesa-dram
https://theretroweb.com/expansioncards/s/ati- … ch-32-vesa-vram

But the later version just sort of left them out:
https://theretroweb.com/expansioncards/s/ati- … 32-dram-version

What's the downside of the card that doesn't have the F244 chips?

Reply 1 of 3, by Tiido

Posted on 2025-03-05, 17:45

Tiido Offline

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Ones with them are probably able to work better when there are 2 more VLB devices (stronger bus drive capability), but possibly not reach 50MHz or higher reliably due to delays from the buffers.

Ones without are less likely to be able to coexist with more VLB cards but are probably able to take 50MHz+ without an issue.

The VRAM based card I have does have the buffers and works ok at 50MHz with one more VLB card in the mix.

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 2 of 3, by douglar

Posted on 2025-03-05, 18:24

douglar Offline

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That all makes sense. Thanks for the info!

Reply 3 of 3, by Disruptor

Posted on 2025-03-05, 18:30

Disruptor Offline

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My ATI Graphics Ultra Pro VLB even does not like 40 MHz FSB.

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