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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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.
Sometimes the ordering of bits into usable ROM words is obvious. Sometimes it isn't, and some additional tracing of the silicon is needed. This tends to only work when it's a mask-ROM part, since the ROM bits are physically "printed" on the die through the manufacturing process.
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In other cases, this was done for the first few handhelds, then some additional time was spent investigating the surrounding circuitry to look for a possible verification mode for the chip, where it'll spit out its internal ROM if poked the right way on its pins.
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The idea is that the IC manufacturer's customer typically needs a way to verify that the product is programmed correctly. So, if that can be done, then there's: 2) Use documented (or not) methods to dump the ROM contents electronically.
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