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Newly made ISA CL-GD5434

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Reply 60 of 67, by Jager

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Ok, looks like I've routed everything. Now it's time to correct silkscreen, optimize and double-check everything else. And I've probably have lots of time for this - Utsource still can't send me IC's I've ordered. Few notes:
1) It's 2mb only for now. 1mb won't work due to schematic modifications I've made to simplify routing, 4mb was considered risky due to increase routing complexity and, possibly, bios limitations. Although it's still possible to add additional 2mb through double-stacking - RAS0 is available at TP1.
2) I've opted for 39SF010A instead of 27c256 EPROM. Due to it's capacity you can use two ROM images up to 64K (32K VGA + 32K extra, XT-IDE for example) - selectable with a jumper. 32K-64K selection needs some soldering though.

dirkmirk wrote on 2020-06-27, 14:18:

https://www.youtube.com/watch?v=laMzPYhFSHE&t=5s
Also have the STB Nitro 64 2meg.

Can you please share it's bios? I've found Diamond's v2.02, but not STB's V1.1.

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Reply 61 of 67, by 386SX

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That looks already an awesome card! Also what about the sw drivers? In my previous posts I talked about the problem I've found with the ISA version of the GD5429 (at least on the UMC chipsets) and the generic drivers probably built for the VLB ones; I suspect that also the GD5434 being a PCI oriented chip may have different drivers config for ISA and PCI version.

Reply 63 of 67, by Anonymous Coward

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I know a 4MB version has been written off (and perhaps not all that useful), but wouldn't it still be nice to leave a few solder pads to allow the end user to add 4MB if they want?

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 64 of 67, by maxtherabbit

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Anonymous Coward wrote on 2020-07-01, 00:08:

I know a 4MB version has been written off (and perhaps not all that useful), but wouldn't it still be nice to leave a few solder pads to allow the end user to add 4MB if they want?

he just said it made the routing horrible, so probably no

Reply 65 of 67, by Anonymous Coward

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Ack, didn't see that.

Oh well.

"Will the highways on the internets become more few?" -Gee Dubya
V'Ger XT|Upgraded AT|Ultimate 386|Super VL/EISA 486|SMP VL/EISA Pentium

Reply 66 of 67, by Jager

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Anonymous Coward wrote on 2020-07-01, 00:08:

I know a 4MB version has been written off (and perhaps not all that useful), but wouldn't it still be nice to leave a few solder pads to allow the end user to add 4MB if they want?

It's not written off, just not in the first revision.
If you can solder SOJ IC-s you'll be able to double-stack them. Place second memory IC on top, solder everything pin-to-pin except for RAS (pin 14). Connect RAS pins of the additional ICs and run a wire to a test point on the PCB. Done!

maxtherabbit wrote on 2020-07-01, 02:24:

he just said it made the routing horrible, so probably no

Not horrible, but that'll increase error chance, and Diamond Speedstar64 BIOS simply has no "4MB" string in it. Haven't looked into this yet.

Reply 67 of 67, by 386SX

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Also I imagine additional costs and it's good until it will stay as cheap as it can be. The point that make this awesome it's not only a 2020 late generation ISA card, but also that it could have a reasonable price.
I wonder how the test of such card might be difficult or not.. I suppose even the lenght of the traces may or not improve or decrese stability or such things. I remember from the Arduino sbc experience projects that people had problem just designing the trace on the pcb and the time the signal would have, being close to other components, etc... I suppose the debug of a self made card might be not easy. 😀