This console was made in Hong Kong and sold under many names like Grandstand, Soundic, Hanimex or as in my case MARK (Prelude Modell 64562).
My first attempt was to make a Composite video mod. This resulted in a horribly noisy video output. After some investigation I realized that it is easy to make an RGB mod for this console since it has separate signals for sync and the graphical elements. The signals are provide by the "AY-3-8610" chip in the cartridge. This is a single-chip-game that is called Supersportic or PC-501. It has 8 Pong style games and 2 that requires a rifle. I mapped the colors as close as possible to the original except for the background that I made black mostly because it was easier. But I think black is kind of cool. I may go back and add an option to make it green later. That would require a 3 input NOR gate...
Below are some notes that may help if you are going to do a similar mod. I also removed the RF-modulator board and replace most of the capacitors. I accidentally blow up a 1N4148 diode before I realized that positive voltage from the external 9V PSU is ground for the circuits on the board!
I cannot sleep for 3 nights. How to make background color? Where you take background signal if background chip on cartridge is not connected to any slot? Please help me! and thanks!ReplyDelete
When none of the other signals are active it is the background.ReplyDelete
Then if a put signals 12,13,14 (Boundaries, P.right and P.Left) through a 3 Gates input NOR, the output goes to green signal of RGB Scart map... I’ll have green background as original?ReplyDelete
Yes, that should work.Delete
Done, putting 12,13,14 (Boundaries, P.right and P.Left) through a regular inverter and then thought a 3 Gates input NOR, the output goes to green signal of RGB Scart map... I have green background. BUT only works with super sportic and Motocicle with other games have strange colorsDelete
I think that this may be caused by the fact that one of the pins 12, 13 or 14 is unconnected in the cartridge. A week pull/down might solve it.Delete
I think that we map by wrong way. There is more than one way to map a game. Maybe there is a common map for all games that is not the one that we are using now, andDelete
I think that the end of the question is the background.
When I disconect all signals from RF board screen in green . Maybe background green is always control by Soundic not by game
Would somebody have a sumary schematic of all that ?ReplyDelete
These kinds of mods are viewed as second rate compared to different sorts of regulator mods since you generally need to hold down the catch for the rapidfire to work. Kinemaster Pro APkReplyDelete
Can't understand what you are writting Bennie !ReplyDelete
Danaellinux would you have a whole schématic for moding this pong ?
It's a complete headache. Pins are connected in all games. I map colors on SuperSports perfectly. But on other games do not match.ReplyDelete
Fabrice I have been work on this for 6 months I do not have success. I change scquematics all days. When I have something stable I'll try to publish it. My be try to open a new Discord to share knowledge
I'm also scratching my head. I have a suggestion I'm working on... May be the background is given by the clock pin of the cartrigde (pin 4). Strange but this console is really weired ! This worth a try.Delete
oh! I'll try too. but take a look to the pins that goes to the RF module, that are the real signal pins. As Patrick says not all games uses al cardrige pins. In fact pins 10 and 11 from RF board goes to clockReplyDelete
I think I found the point where to solder the green background. It is situated on the dauther-board. The late problem is that the signal even if clear, objects are thick shadowed... and I don(t kniow how to correct this. Give me your contact I will mail you a picture Danaellinux.ReplyDelete
Hi! Is there a full schematic available? I don't know how to connect the wires of the mod to the scart...ReplyDelete
I don’t have one by now. Still impossible to make it workReplyDelete
Not even with the black screen like the photos shown by Patrik?ReplyDelete
Actually I prefer black playground...