Found this oddity,
What can you all tell me about it?
What’s max ram? Which chips should I get for it?
How good/bad is it?
What’s the missing chip on the back?
mysterious ? the name is on it.
Though , check what is labeled on the pcb underneath the sticker. It kinda looks like it says 'viper pro' underneath the sticker.
Diamond viper is well known in several variants.
there's one on ebay for sale for 250
this is the pro one, with the chip on the back. https://www.vgamuseum.info/index.php/cpu/item … eo-weitek-p9100
chip on the back seems to be for video processing, mpeg decoding perhaps ?
which ram chips? according to the ebay post, km428c256j-6 or equivalent.
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Sphere478 wrote on 2024-03-10, 19:17:What’s max ram? Which chips should I get for it?
How good/bad is it?
What’s the missing chip on the back?
Check https://www.vgamuseum.info/index.php/cpu/item … eo-weitek-p9100 they have a card with the chip on the back and RAM maxed out.
The RAM chips in the sockets are 256K x 8 FPM VRAM chips, so 256K per chip. The socketed chips thus result in 2MB of RAM. The soldered chips are most likely another bank of the same size, which each chip being 256K x 16 VRAM, so the entire card has 4MB of video RAM. These chips support all typical VRAM operations, including stuff like "block write", "flash write" and "write by bit". I don't know if all of these operations are used by the Weitek Power 9100 chip, but when researching for compatible chips, you should check for "full-featured" VRAMs.
The missing chip on the back is a Weitek P9130, which is described as a video processor, likely offering similar features to the video engine in the Trio64V+: In that case: it can display a low-resolution YUV video scaled up in a window or the full screen of your GUI desktop.
