First of all, several comments about it:
- very low quality. The case is made from soft plastic. Then again, for about 12$ i got my money's worth.
- power supply does not fit in standard european sockets (fixed that)
- the included cartridge claims 9999999 games. Of course, only 5 different games, the rest are variations (Super Mario, Jewllery, Baseball, Olympic and Duck Hunt).
- them cheap manufacturers included an A/V out connector, but it was not connected internally, so it only put out RF signal, with the worse quality I ever seen. Weird, since there was space on the PCB for a transistor and 2 resistors, but they did not put them. Fixed that too, but instead 2N4401 i put a BC172B. It works, but there is a lot of dot crawl, and I might try again with a 2N4401 to see if the image quality improves.
I think this one is a keeper, and I'll mod it heavily.
Next one will go to a portable project (once I'll get a 5" LCD screen).
I can't find screens at a decent price. Found a 5" LCD TV for 550 RON, that's an outrageous 220$ for a no-name, made in China TV.
Ok, now for the pinouts; I figuered them out with my trusty multimeter and by following the PCB traces.
Ok; it follows; keep in mind you are looking at the PCB, the cartridge connector is on the other side.
A:
1. +5V
2. GND
3. Video out
4. Audio out
B:
1. GND
2. /RST
3. DATA 1
4. DATA 2
5. CLK 1
6. Lightgun 1
7. LATCH
8. Lightgun 2
9. CLK 2
10. +5V (from the power switch)
11. +5V (to the power switch)
Oh, well
TODO:
- Another power supply; the original one has a bridge rectifier made with 4 1N4001 diodes and a 1000uF filter capacitor; I'll put a monolithic rectifier and maybe a larger capacitor. Maybe I'll fit it inside the case.
- Completly redesign one of the PCB's, the one with the connectors; Put a 7805 voltage regulator instead of the discrete components and a pseudo-stereo adapter; so, instead of the RF out, Video out and Audio out I'll have Video out and Audio L-R
- Maybe do something about that horrible dot crawl.
But I have some suggestions.