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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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.
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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1b) Throw the exposed chip die under a metallurgist's microscope, since they light downward from the objective, not upward through the slide. Hopefully have good X/Y control of the stage. Take lots of photos. Stitch. Manually transcribe bits.
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