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.
What is this Victor hc-9x home made extension card used for?
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.
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
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.
Here are from top and bottom view
