Recent content by MaRC

I'm powering the cartridge from the neo geo itself, but do I need to solder the Vcc and Gnd contacts of the blaster to the jtag, or only the tck, tdo, tdi, and tms contacts?

Please remind me - it is advisable to power the cartridge board from the neo geo, and the vcc and gnd pins of the usb blaster need to be soldered to the board, or only the 4 data pins?

I need help. I successfully flashed my own cartridges, but then a friend asked me to flash his. I flashed two C roms, but the third one wouldn't pass the test. I re-soldered it onto the board several times, but now not only the last chip but also none of the previously successfully flashed...

Seems to have solved the problem -68000 transmits to the z80 what to play and at what volume on 2 eight-bit buses. From PAL IOA1, the signals go to the 5B LS32 and then to the 10J, 11J LS374. Using an oscilloscope, I checked that both signals were coming to the LS32, but only the second signal...

I ordered another A board, this time completely original, and I will use an oscilloscope to compare all the signals with the non-working one.

I bought 2 new ls374 from a trusted seller, but there's no sound at all. Previously, there was a looping sound almost every time I turned it on, but now it only happens once out of 15 times. What else should I change, 68000?

I also have an 87-in-1 board, and at startup, I get random sounds with any game. The Chinese guy soldered two different brands of ls374, and if I swap them, the sound completely disappears. Obviously, one of them is faulty, so I'll order two new ones.

I replaced the audio RAM and z80 with known good ones, but the result was the same: random sound or music at startup. If it's a random sound, it plays and then there's silence. But if it's a random music at the beginning, it continues playing until you reboot. So, the Z80 selects music from the...

Only one capacitor is missing, and it's in the analog part of the amplifier harness, but the problem is with the digital part.

CPS1.5 with poppulated audio part from donor board. But not all parts -Z80 has a 6 Mhz model installed.

I connect the board to the TV, the volume is not high and the amplifier does not heat up at all. The original radiator is on it. It's not a B board- I have 87 in 1, and I ran the same SF2 CE from it in different regions, as well as other games - the behavior is the same. There is a random sound...

I'll also write about the sound, maybe you can help. I bought a Street Fighter 2 CE kit on aliexpress. Upon arrival, it turned out that it was CPS 1.5 with the audio part transplanted from the donor cps 1.0. The sound worked fine at first, but disappeared after 10 minutes. If you let the board...

In Street fighter 2 CE, the test menu is enabled if you turn on the 8 dip C switch. Other games probably have taco menus too, I haven't checked.

The seller has B+C kits again. I took the kit and tried it anyway with my 92631C-6 - it's too wide and one of the capacitors on the B board does not allow it to be fully inserted into the slot.

If everything is fine, how long should a new battery or a fully charged battery last? I have 3 mv1cs, and the new battery runs out in about a day on all of them.