Recent content by natas

It looks to me you found the initialization, question is, how is it called service menu? Maybe creating a (2) patched EPROM(s) that jump directly to this code fix the issue. After that you place the original ROMs and it works again?

Do you still have the board?

The HD-VC9900 has problems with the Irem 55Hz, if you tweak the geometry you get picture but it's not stable. I will try a GBA-Control mod as soon as the ESP-OLED board arrives.

You find your answer here: https://github.com/ramapcsx2/gbs-control/issues/165 Yes it's just a 2-in1 device GBS-8200 + VGA2HDMI converter.

The Supergun or CBOX as the manufacturer calls it, had finally arrived. I put some stickers on to replace the Chinese text with English. I misslabled as I translated the Chinese with google: Service should red Coin 1P, and Coin is Test-button and Coin 2P What I found out so far: - There is...

What would life be without humor? I am very aware that the selected things are everything else than top of the line. But I am quite convinced that I can bring them with some tinkering to a useable level and maybe it helps interested people to get a cheap start so let's see what I will experience...

With some luck in the next two days my supergun the cables and the HDMI adapter will arrive. Then I can find out the exact 15Pin layout if the map 4 buttons + coin & start or 6 buttons or even 8 buttons and skipped the 5V. Connecting the big 6 buttons is really easy, to use the top 4 buttons i...

Maybe because I am not a native speaker and relied on translate app as I did not know how that feet are called that stick to your table buy suction. It's a chemical smell. This is what I am talking about: If someone buys that stick be warned pressing all buttons same time will stop it from...

Update: The Joysticks arrived: First impression very light 300g without cable and 360g with the long USB-cable. The suction cups smell strongly. Joystick feels okay not arcade like but good for the price of 15€. Same for the buttons. First test normal operation: Device has 2 modes PS3/PC and...

I have some doubt about the untested PALs from the lower board. The silk screen say 16R8 and 16R4 and the PALs used on my board are registered. Maybe I am wrong, but registered PALs usually can not be bruteforced. The replacement GAL is not registered. I will try if the GALs works, but i need to...

I just found an opportunity to get 20x new SST 39SF020A DIP32 for 25€ including shipment in Germany that should give me a good base for experimenting. @Hammy I would be happy if you can guide me a little by telling me which (custom) chips are in charge for handling the DMA and if there are...

I tried to find the PROMs that are mentioned in the Mame zip. I can only find a hand full of PALs on the board instead, but also not the ones Caius and Porchy dumped. They seem to have used registered ones in a couple of locations also noted on Silkscreen. Okay, I understand it's not compatible...

I received the boards I and dumped the ROMs. I can confirm the ROMs of the boards marked RABEN-1190A/B/C HAMMERIN HARRY are identical to MAME HHARRYB.ZIP It seems the original dumper did not find the numbers from some ROMs on the middle (MainCPU) PCB. On the bottom PCB the ROM sockets are...

I can have a look if I can update mame code. I have the feeling most of this things are inaccuracies where the game works more less as it should on mame even with this inaccuracies in place or are your corrections/informations fixing major bugs? I had a look to the M72 small top board of R-Type...

What kind of fixes are you talking about?