Switchless NESRGB for AV Famicom

This modification adds a NESRGB and a NESRGB-IGR (in game routines/in-game reset) daughter board to a Nintendo AV Famicom.

First look of the open AV Famicom and the NESRGB kit. There is a lot of assembling to be done.

NESRGB for AV Famicom
NESRGB for AV Famicom

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NEC PC-9821 and the Framemeister

The NEC PC-9821 computers output a very unusual resolution that most western monitors struggle with: 640 x 400 @ 24 kHz. I tried at least half a dozen monitors of all types and ages and none of them was able to display a picture at all (except an “out of range” message). Video scalers like the DVDO iScan VP50 Pro don’t recognize the signal either. Some sources claim that the cheap GBS-8220 converter is able to convert the signal – that is only partially true. You can see a stuttering picture that eventually becomes clear when you start the Windows 98 Desktop, but that doesn’t work in DOS.

Of course you can buy a special converter like the Micomsoft XPC-4, that will cost you 300-400€ though. There are other solutions:
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