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Picked up a PAL 1701 (240V European model) that was suffering from frame collapse, now resolved after replacing a few failed components. Just waiting on a replacement shielded speaker, as the original failed open. I'm feeding composite video from the 240p Test Suite via MiSTer, and there are...

Hi All. I've been holding on to this for awhile but have been meaning to share it. Here's an early version. Currently only handles power up tests whilst I figure out how to cram in the diagnostic mode display of the program on a rotated/vertical screen. Finding it a little difficult to get a...

This version doesn't replace the original but offers better troubleshooting for boards with bad rom at 11J. On the z80 and as many of you know, the reset vector is at 0. The original game checks for a diagnostic rom at the 14J position. The issue here is my code at $6000 will never run if your...

I have a couple of ST M27C160 EPROMs that won't erase completely. Both chips have the exact same data at 0x400-0x401 (See attached) Is it likely that both chips are faulty or won't erase in this location only ( seems unlikely ). Or would this be an issue with the TopMax's software/hardware ...

Hi all. I am releasing an initial version of Pooyan diagnostic's rom. Hasn't been tested on real hardware yet. Hoping someone can get around to it and post some feedback. The EPROM installs on the CPU board @ socket A4. Will detect STERN, KONAMI and POOTAN versions of the ROMs. Has a...

I'm releasing this initial test version. Just replace the ROM C01 with this one from socket G5. This ROM is only used as a means of testing and doesn't replace the original game ROM. This works just like the Hyper Olympic/T&F test rom. DIP 3 of SW2 set to off resets NVRAM. Otherwise NVRAM...

I'm currently developing a Track & Field / HyperOlympic test rom and I'm looking for some testers before I make an official release as I don't have a PCB yet. All testing so far has been done via MAME & development using a self modified version of the a09 cross assembler. I would prefer if there...

For those of you interested in home-brew development for the Konami-1 era hardware. I have just released A09 cross assembler based on L.C. Benschop's original A09 C source with changes taken from the MAME source to facilitate support for the Konami-1 CPU. The Konami-1 is a custom made CPU...

After receiving positive response from people regarding development of my Gyruss diagnostics rom I decided to start developing one for Time Pilot which will be released within the next week or so. I plan to do others in the not too distant future. Here is a short preview of the sprite test...

Bought defective Gyruss PCB off ebay Symptoms: Game watchdogging. Only displays grid test pattern, sometimes partial then resets. Voltages a little low ( 4.7v ) on the CPU board, increased 5v voltage. No difference, same symptoms. Verified all ROMs via romident. Probed Z80 main CPU...

Using a CPS2 game with Qsound enabled as a source I've determined the problem is with the headphone jack & am trying to find an effective method to clean it. I've tried using some Isopropyl on the end of my headphones and exercising the jack but the problem returns a week or two later ( no...

Hello. Just wondering if anyone can help with a minor video issue. I picked up a SF2CE board with very bad gfx and verified two bad mask roms ( s92-1M & s92-2M ) that would not read at all, I burned two EPROMS ( AM27C400-105 ) to replace them. This fixed the majority of the problem however...

Hi All. I was wondering if anybody could offer some suggestions on fixing a small issue. I have Burnin' Rubber pcb board also known as Bump 'n' Jump in the U.S. When I fire it up the video display is normal for about 3 minutes, then some white vertical lines appear on the screen. About 5...

Hi there, this is my first post I recently bought a Galaga board that was previously worked on. Fired it up for the first time and it was completely dead. The video board had all resistor packs covered in hot glue to prevent them from moving, this made the repair much more difficult. So I...