Thursday, November 5, 2015

Hanimex HMG-7900 cartridge PCB scans

I'm still trying to retrace all the pins of the D779C-300 so when it will be finished, i will post the pinouts and infos. But in the meantime, here's some scans of the cartridges i have so far:

 SD-201 (front)

SD-201 (back)

SD-202 (front)

SD-202 (back)

SD-203 (front)

SD-203 (back)

SD-205 (back)

SD-205 (front)

As you can see, the SD-201 (aka Chaser/Gobeur) doesn't have any ROM, only a PCB with some jumpers to activate the Chaser/Gobeur game which reside in the D779C-300. So when another cartridge is connected, it shuts-off the Chaser/Gobeur game and the ROM replaces the Chaser/Gobeur game.

SD-202 (Space Smash) and SD-203 (Saucer Attack) have the same PCB's and connections, the only difference between the two is the model number of the ROM which are made by Motorola: SC87027P (SD-202) and SC94806P (SD-203).

The SD-205 (breakaway) PCB has also the same connections BUT it has a CD4069, two diodes and three resistors as extra components. Since i don't have all the other cartridges, i can't say what is it truly used for as i didn't retrace the PCB, but it looks like (just guessing here) that it is for the paddle as it is the only game that uses the paddle. Will know for sure when i have retrace it. ;)

I tried to find information about the Motorola ROM(or Masked ROM as plgDavid suggested since he told me that many time masked ROMs doesn't have any specific indications) but i only found that some companies has still has some of the Motorola ROMs in stock so no datasheets or extra information (so far). But what bugs me is that the smallest EPROM that has 28-pins is an 2764 (and compatible) which can contain up to 8K, but seeing how the games are very blocky and simple, i would estimate that the games are 1 or 2K in size.

I will lend these carts to plgDavid so that he will make dumps to preserve them and to see the Soundic SD-200/Hanimex HMG-7900 emulated one day. =)


--- Sly DC ---
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2 comments:

  1. gilles fetisFebruary 20, 2018 at 3:17 PM

    I confirm 2kb for SD204 that is different from others cartridges and based on a 8049 clone. I dumped it in march 2015. but I could not identify the motorola chips.
    BUT cartridges are not rom, they are microcontrolers.

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  2. Sly DCMay 26, 2018 at 9:15 PM

    Hi Gilles, sorry for the late reply. So the chips are uP ? That's good news in a sense because this is a step to understand how those works and how to dump them.

    But you wrote that you dumped the SD-204 ? Have you given the dump to the MAME/MESS team and the information how to dump the games so that maybe we will see this console finally emulated ?

    Sorry for the questions and my curiosity! =)

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