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ISA riser pinout for PCD 300 PHILIPS

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First post, by Saekita <3

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I recently rescued this very unpopular 386 computer in very bad shape.
Now I want to attach it a soundcard, but ISA riser is missing, so I can't plug it.

The only one computer that looks the same is here: https://oldcomputer.info/pc/Philips200/index.htm
Even being a 286 model, the riser should be the same in my Philips PCD 304/00 . I would talk with the owner of the web to see if can get me a pinout, but no email or contact way there. Someone knows how to talk him?

So I just tired up and fitted the ISA card into the port, but it gave some beeps and refused to boot. Idk if it's 2 8bit ISA slots, or a 16bit slot with pinout changed, or... Suprise(?)

I don't find ANY information about this board and it's riser. PWA-MS386SX BD . It's not a Phillips, but a strange mitac board which is no info anywhere. I tried to follow the lines to the chip controller of ISA, but it's so difficult and I don't find also pinout of the chip.

I'll try to give pics of the ISA (?) port.

Reply 1 of 7, by IsAspen

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Hi,

I just got a 386 with the same mobo and I have the 2-slot riser. Do you still need any info about the riser? Would be more than happy to help if I can.

Unfortunately mine had a goldstar modem card installed that had a varta battery leaking over the motherboard and it destroyed one socketed chip labeled "mi316s r01 u77" underneath it.

Found some info on the motherboard on the retroweb (mitac mi316s), unfortunately no additional info or roms in there 😞

Reply 2 of 7, by IsAspen

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Added pictures of the riser card.

Reply 3 of 7, by Rider_in_the_Blue

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IsAspen wrote on 2024-12-31, 13:37:

Added pictures of the riser card.

Hi!
I hope you don’t mind me asking — I’m trying to build an ISA riser similar to yours and I was wondering if you could share a few detailed photos of it. I’d really like to replicate it as closely as possible.
If possible, could you also check the connections with a multimeter and let me know how they’re wired? I’m having a hard time understanding the front side of the board and how the circuit is laid out just from the pictures I’ve seen.
Any help would be greatly appreciated. Thanks a lot in advance!

Reply 4 of 7, by wierd_w

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This looks like a bog-standard passthru with a vesa feature connector tucked on the side.

The images look sufficiently clear to follow the traces to me. [Shrug]

Reply 5 of 7, by rasz_pl

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yep looks pretty straight forward. @Rider_in_the_Blue tell us which pins you have trouble with, or better yet make a kicad project and put it somewhere online and Ill assist you with problematic spots.

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/440BX Reference Design adapted to Kicad

Reply 6 of 7, by Rider_in_the_Blue

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Thanks for your reply!

I’m not sure it’s as simple as it looks, though. I found another picture of the board, and from that angle you can clearly see that two or three connections are actually not linked straight through.
That’s what’s making it a bit tricky - it’s not just a direct pass-through, and without knowing exactly how those specific pins are routed, it’s easy to get it wrong.

Reply 7 of 7, by rasz_pl

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Wont be such a problem since you have motherboard to verify and ISA pinout is known.
mobo is Wyse WYSE DECISION 386SX/16S https://theretroweb.com/motherboards/s/wyse-w … ision-386sx-16s
theretroweb lists wrong 82c451, they linked C&T 82c451 which is a VGA controller in 144pin package, but the board uses 68pin UM82C451 serial/paraller port controller https://www.alldatasheet.es/datasheet-pdf/pdf … C/UM82C451.html and doesnt mention it was used in any Philips computers

should be easy to track all the non obvious pins to their sources

https://github.com/raszpl/sigrok-disk FM/MFM/RLL decoder
https://github.com/raszpl/FIC-486-GAC-2-Cache-Module (AT&T Globalyst)
https://github.com/raszpl/386RC-16 ram board
https://github.com/raszpl/440BX Reference Design adapted to Kicad

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