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Feasibility Study: VRAM upgrade of 1/2 HPV VidCard to 2/4 capability.
Posted by: Trash80toHP_Mini on 2018-11-15 13:49:49 I've been in touch with a member who should know and he thinks this might be worth looking into. I've got examples of Apple's HVP 1/2 card and have compared it to my Power Computing HPV 2/4 card. The board layout is very different, but components are the same with RAMDAC, ROM and ASIC being identical Apple parts but for designation differences minor enough to reflect the 2-3 years different production/copyright dates on the two cards. I've hit a brick wall because I nave on Apple 2/4 HPV Card for comparison. It shipped in the higher end 8100 configurations if memory serves. Could someone upload High Res pics of the Apple card for comparison to the 1/2 boards I have on hand? 'fritter's NuBus Mafia has pics of the AV card, but none of the HPV cards that I could find. That would be a fab place to do the upload. Here's the pic of my PowerComputing 2/4 HPV Card for reference if you're scouring eBay for the like: View attachment 18208 Help with pics would be much appreciated. Just really curious about it at this point, bit crazy cool thing to try if the prospects look good.
Posted by: Franklinstein on 2018-11-15 15:25:37 Do you have any specific model numbers for the card you're after? I have a few HPV cards, including a couple out of 8115/110s, but I can't be sure they're the high-capacity version you're after.
Posted by: Trash80toHP_Mini on 2018-11-15 19:46:29 I was told the part number for the Apple 2/4 HPV card is 820-0509-a, my Apple 1/2 HPV card is 820-0522-A, but that's only a designation on the silk screen layer. Copper etch on solder side reads: M1 94-0 T204 the "204" is in an italic stencil font and the whole thing is likely the board number/run info etc, dunno. Bt9055 RAMDAC 100 and ASIC appear to be the same with only minor designation changes. ROM version is 9515 on PC 2/4 and 9491 on Apple 1/2 The capacity of the VRAM ICs on a card is probably the easiest way to tell for sure, but I'm too tired to dig my cards out again to look.
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