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I don't know, I have to do some logic analyizing to compare signals of original custom IC and reproduction.Probably it's something to do with FPGA being too much fast for the old TTL hosting hardware.I don't think there is some mistake in 'furrtek' work since the reproduction works fine on all...

Thanks to the always brilliant work of 'furrtek' another custom IC has been reproduced and preserved. It's the Capcom '86S105, the sprites generator used on many PCBs like : 1943 Ashita Tenki ni Naare, Black Tiger, Block Block, Capcom Baseball, Capcom World, Dokaben 2, Pang, Poker Ladies...

Very good job.If that electrolytic capacitor is a problem for the top cover I can use a smaller/lower one or a tantalum one.

Very good job.How do you think to handle the ON/OFF switch?

Yes, this was my assumption since Demon's World do use the 'GXC-04' MCU.

The GXC-04 is a TMS320C010 DSP co-processor in disguise with internal MASK ROM, it's used as protection. Anyway, I just checked, Zero Wing PCB does not carry the 'GXC-04', maybe your are confusing it with the 'FDA' chip.Please, check better your board.

Hi, yes if the 'GXC-04' is really bad you can use my replacement (it replaces the other Toaplan MCUs as well).Contact me in PM.Thanks.

If the RAMs are reported bad although you replaced them it means that they cannot be reached/adressed by the device that wants to read/write them.Schematics of this PCB are not available but you can easily figure out which device the RAMs are connected to.If the RAMs are the WORK ones they are...

Judging from its position the electrolytic capacitor @C4 is most likely for filtering the +12V line.The board can run without it but sound amplifier may oscillate and break.

The silkscreening under the socket says 'SEI0021BU' so I think you need this one and not the 'SEI0020BU' which is different.I reproduced the latter but did not test it on many boards (the chip may have different configurations)

Hi, the 'GXC-0x reproduction is for sale on my eBay and Tindie store, if you cannot find it, please, contact me in PM.Thanks.

I know these drivers are for FM-TOWNS computers with dead built-in CD-ROM unit, they cannot be used with Marty (even more when you have a DocBrown).Replied in PM to your message.

Hi, the project is finished and working but not yet for sale because it's not really a user friendly solution, some advanced skills are required.Anyway, I have some assembled units, if you are interested, please, contact me in PM.Thanks.

This has been sold elsewhere.

You can find it on my Tindie store, search for it.Thanks.

Well, I think that, if you hear something, the digital circuit is running.If the SEI080BU was bad you shoud not hear anything.I suspect the 'HB-41' custom SIL is fault, this analog part is a kind of amplifier and mixer of music and sound FXs.it's a quite prone to failure part, I did time ago a...

I meant the ribbon cables and the connectors that interconnect the two boards.

Check the ribbon cables and connectors, I experienced the same issue on my board.

For sale a not working The Simpsons PCB.Board appears to be complete with no missing parts but not working (showing only a flashing blank screen).Some repairs done (see pictures).Price is 120 euro plus shipping (from Itay)

For sale a fully working Vendetta PCB.Some little signs of repair (see pictures).Heatsink of the sound amplifer is missing.Price is 170 euro plus shipping (from Italy).