Can anyone direct me to where the development process is explained for LCD/VFD electronic game emulation? I'm fascinated by this.
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In all cases currently supported by MAME: Yes. Systems-on-a-chip (SoCs) are old hat these days, and probably most familiar to people through the Arduino and other dev boards, but they've existed since the late 70's, although they were called microcontrollers (MCUs) then.
A wide variety of MCUs were used in seriously vintage LCD/VFD things: The NatSemi COP400 range, the TI TMS1xxx range (Speak 'n Spell, anyone?), Mitsubishi MELPS 4, AMI S2000, Rockwell PPS-4, Sharp SM5-series, and many others. For the most part, 4-bt architecture.
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Yes, 4-bit architecture: Register widths tended to be one nybble in width, getting paired together for bytewise operations. ROM sizes were on the order of 1-2 kilobytes, RAM usually between 64 and 128 nybbles.
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As for dumping the ROM contents, it boils down to one of two ways, with some overlap: 1a) Depackage the chip using sulfuric or nitric acid, remove the metallized layer with fluoric acid. Remove chip die, clean in Whink.
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