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Radofin 1392 Advanced Programmable Video System multicart

A

anti77

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Joined
Oct 9, 2023
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Found in the attic an Audio Sonic 1392 Advanced Programmable Video System made by Radofin (sold also as Acetronic, Prinztronic, Fountain, Grandstand, Hanimex and Lansay in other parts of the world). Have no idea where or when I got this, but I have no cartridges to test it so I designed one and ordered it from Jlpcb today:
radofin_front.jpg
radofin_back.jpg
The 6 pin IC will be actually a DIP switch to choose between ROM images crammed into a 27128. You can see the Kicad schematic (ugly), pcb, gerbers from Github (it's my first design in a very long time). I've uploaded it to PCBWAY shared projects too.

After I'll receive the boards I'll let you all know when I assemble it and test it as I have my doubts around the CE signal that activates the ROM outputs as the original cartridges were 2632 with 3 programmable chip enable...
 
What do you know, it worked right away.
IMG_20240325_134528_9.jpg
Tested so far with 8x2kb rom games that required no RAM. Used 4k7 for the pullups.

Even if I shut it off before switching games, I have to reset it again after poweron, otherwise some games don't load.

Used this site to look up the games and stuff.
 
For 2k games you have to cut the A11 line (pin 6, front, from the right) between the cartridge port and R1, as I had difficulties otherwise selecting D1. You can paint nail polish over A11 or even a piece of tape for a more non destructive solution...
 
Great project! I just finished restoring a Radofin 1392 and wanted to try your cartridge. However I cannot get them to work. I've tried one with 8x 2k games and one with 4x 4k games. In the one with 2k games I soldered all the resistors in (3x 10k) and on the 4k games version I left out R1.
In some dip switch combinations something is shown, but mostly garbage or sometimes just a score. And in some combinations the Radofin don't "boot" or just hangs.

Any ideas what I could be doing wrong? Am missing?
 
For 2k roms see my post above from Mar 25, 2024 you have to cut A11 or isolate it.

Do more than one reset. Any original cartridge that works to prove that the machine itself is ok? If not, I belive you still have to do some repair, maybe https://amigan.yatho.com/ can help you.

Otherwise I'm out of ideas, this was something I done more than 2 years ago and I sold my Radofin 1392 with all cartridges more than a year ago...
 
Thank you for taking time to answer my question :) Unfortunately I've already tried multiple resets and disconnecting A11 without any luck. The Radofin works with 2 original cartridges, so that's not the issue either.

I've seen the reference to cutting A11 on some of your other posts too. I've mounted the eprom in a socket and bend the A11 line (pin 23) so it does not connect - that is what what the "cutting" refers to, right?
 
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