Recent content by xga

Apologies, Eruption2405. I was looking at the screenshot in the user manual of page 5 and saw that it listed SRAM / DRAM in the type of devices you could choose, so thought it would be compatible. After looking at the supported device list...

I've never used or seen that EPROM programmer before, so I can't tell you exactly what to do. Did it come with a manual or any software? If not, I think the manual, USB driver and software installer linked below should be compatible. From a quick glance at the manual it looks like the...

So it sounds like some of the RAM IC's might be faulty otherwise if it was a TTL logic issue, the error message would have stayed the same when you swapped the RAM over. Most EPROM programmers will be able to test RAM IC's, so if you know of someone who has one, you might be able to get them to...

Sounds like you might have a fault with one of the SRAM's used for the work RAM which I think might be located at 21K and 21M/N on the main CPU board. They should be socketed, so they are nice and easy to remove. Hopefully you have the means to test them. If not, you could try swapping them...

Reconfirming my interest in this multi. Thanks for doing another run, Mitsurugi-w.

These look amazing! Not sure if it has already been covered elsewhere, but how do these differ to the previous reproduction spinners you made?

That's not something I can easily answer, sorry. I use a logic analyser that analysers the selected IC whilst the board is being powered. Yes, Fuji MB8464's are a compatible replacement and listed on that page I linked to. Just make sure you get the narrow DIP 300-mil type as they come in...

Toshiba TMM2063 RAM IC's (especially the glossy ones) are a common failure point on boards from this era. If you have replacement 64Kb RAM IC's, you could try the piggyback method — placing a known working RAM IC on top of each of the six existing ones, one at a time, then powering on the board...

I've worked on two recently. What is yours doing? Do you have any pics or video of the faults?

They replied back to me and said that it's out of stock...:(

Absolutely amazing work, Caius (and furrtek too)! Do you have any theories why it's glitching with Black Tiger?

Please put me down for one. Thank you!

Probably not, more likely to be a ROM or RAM issue if it's freezing at the exact same spot each time.

I don't know about the Tetris bootleg PCB, but the Atari PCB uses a 28C04 eeprom to save settings and high scores. I've seen the eeprom die before, so might be worth checking if the bootleg has one and if so, swapping it out (I think there's an initialising process you have to do when swapping...

Down for one too, please! :-)