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Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-27, 18:34

Update: Found another pic of the same board with everything populated except the modules themselves. Looks like U20 has something to do with memory after all. I'll order the chip (dirt cheap from Digikey) as well. The main chip is simply WD's rebadge of the original PVGA1A-JK, not a different chip. …

Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 23:28

You could just check if there's any traces connecting the ram to the chip. If there are, chances are the chip is needed for more ram. Problem is, some of those traces terminate underneath one of the resistor packs, and that part of the board has some big honking ground plains in that area. Also the …

Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 22:06

What will you be using for U20 ? from the few photos I can find it seems to be a 74LS157D ? also R19 & R20 are not present on the 512K card. https://thumbs.worthpoint.com/zoom/images4/1/1015/07/western-digital-paradise-pvga1a-vga_1_201699db768a80db87036839c69a1112.jpg That pic is not coming up. I …

Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 21:31

What will you be using for U20 ? from the few photos I can find it seems to be a 74LS157D ? also R19 & R20 are not present on the 512K card. https://thumbs.worthpoint.com/zoom/images4/1/1015/07/western-digital-paradise-pvga1a-vga_1_201699db768a80db87036839c69a1112.jpg That pic is not coming up. I …

Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 19:52

The capacitors are 0.1µF, and look to be 0805 parts. I'm not sure what the resistor array has to be but it seems it should 8x individual resistors, and possibly using same value as the two others nearby looking to be 33 ohm. No clue what the package is called other than SOP16 of some sort. Ok, so …

Re: Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 15:37

The capacitors are 0.1µF, and look to be 0805 parts. I'm not sure what the resistor array has to be but it seems it should 8x individual resistors, and possibly using same value as the two others nearby looking to be 33 ohm. No clue what the package is called other than SOP16 of some sort. Thanks. …

Upgrading a Paradise PVGA1A-JK to 512K

Posted on 2021-08-25, 00:08

Got a good deal on one of these cards, thing is it only has 256K of ram. Thankfully, there are blank sockets for 8 more modules so I'd like to take a shot at upgrading it. Sourcing the sockets shouldn't be a problem and modules of 64k x 4 100ns DRAM seem to be fairly easy to find. That leaves 2 …

Re: NOS Velocity (nVidia Riva) 128 Questions

Posted on 2021-06-19, 01:18

Do you think general purpose caps like the ones I mentioned are ok? I'll probably swap out the larger caps regardless, they seem to be on the output section and if the rep of this chip is anything to go by it needs all the help it can get! I don't know what kind of caps other Riva128 cards used, …

Re: NOS Velocity (nVidia Riva) 128 Questions

Posted on 2021-06-16, 19:48

I have 2 STB RIVA128 ZX cards that don't have a heatsink on the GPU, one came out of a Dell where I doubt anybody messed with it. I ran at least one of them pretty hard doing benchmarks. I don't know how hot the chip got but I don't think a heatsink was considered necessary at the time so having …

NOS Velocity (nVidia Riva) 128 Questions

Posted on 2021-06-16, 19:14

A couple of questions about this card: 1. This version of the Riva 128 is the one where STB just slapped a MOSFET heatsink on the main chip and called it done. I removed that atrocity and put a fairly wide but thin heatsink for a Raspberry Pi on it. I just want to make sure that its sufficient. Pics …

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