What is this Victor hc-9x home made extension card used for?

By popolon_

Champion (364)

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17-03-2023, 13:30

What is this probably home made extension card for Victor HC-9x used for? Output connector is 50-pins, and only 4x 74LS541 + 1x 74LS245 on the pcb.
IMG_20230316_130312644.jpg
IMG_20230316_130244045.jpg
IMG_20230316_130232447.jpg

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By gdx

Enlighted (6210)

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17-03-2023, 14:26

There are only buffers. I think this is a homemade expansion bus slot. At first glance, the pins are "odd numbered" but check to be sure.

By dproldan

Resident (38)

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17-03-2023, 21:54

Really interesting. Is it yours? What's the story behind it?

By dproldan

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17-03-2023, 23:23

This comes at a perfect time for me. I just bought a H-90 unit and was going to make an internal cartridge slot, to solve the problem of only having one in the front.

I went ahead and started making an schematic out of your pictures, and will make some PCBs.

I'll upload it here when I finish.

By popolon_

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18-03-2023, 12:38

dproldan wrote:

This comes at a perfect time for me. I just bought a H-90 unit and was going to make an internal cartridge slot, to solve the problem of only having one in the front.

I went ahead and started making an schematic out of your pictures, and will make some PCBs.

I'll upload it here when I finish.

did you already look at my vhd card, as there is the already pcb dimensions and also the connector?
https://github.com/popolonx/MSX_STUFF/tree/main/vhd_c9d_card

By popolon_

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18-03-2023, 12:40

dproldan wrote:

Really interesting. Is it yours? What's the story behind it?

Yes, it is mine, came from Japan with the victor HC-90. Do not know anything else about it.

By dproldan

Resident (38)

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18-03-2023, 18:43

Thank you for the link to your repo. Yes, it will save me a lot of time!
Do you happen to have an extra PCB for the RGB output you made that your willing to sell?
I'm playing with a LaserDisc unit and am hoping to control it from the integrated serial port. Maybe some day we can make a video meeting and talk about all this!

By popolon_

Champion (364)

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18-03-2023, 20:04

I have extra pcbs for that victor rgb output, but it seems that 5 pcb from jlcpcb.com will cost same (with cheapest shipping method) as one pcb shipping cost from Finland to Spain...

By dproldan

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02-04-2023, 21:23

I finished the PCB re-creation in Kicad:
https://github.com/dproldan/Victor-HC90-Cart/tree/main

I've added SOUNDIN to an unused pin in the backplane connector and a junmper to select between the two different slot select signals.

@popolon_ Could you post a couple of pictures more of that board? I could use a straight top and bottom view it to confirm everything is fine.

By popolon_

Champion (364)

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03-04-2023, 18:20

Here are from top and bottom view
IMG_20230403_1916432652.jpg
IMG_20230403_1917263842.jpg

By dproldan

Resident (38)

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04-04-2023, 13:35

Thanks! PCBs ordered. I'll write back when I receive them.