USM =US Manufacturing As far as I know they went out of business. They were a short order fabricator. Did stuff for HP, Toshiba, Texas Instruments. Usually small runs for prototyping as with Texas Instruments. They also did the knock off chips for some apple II clones.
RISC is reduced instruction set, CISC being complex..., Wikipedia has a few dozen interlinked articles on the various applications of the two. HP, IBM, and Intel all played with systems that used both. HP, Sony, and Sega all managed to use multi chip single interface implementations. HP as listed, Sega with the Saturn and AM series arcade systems, Sony with the Cell systems. The premise is nice on paper. You can do repetitive stuff on a RISC with no overhead as that’s what it’s best for. RISC is actually the more complex to write for as well, I’m not sure how to easily explain it.
The best shot on understanding how impractical the design of combining both is can be seen by looking up any of the open source Saturn games and reading through the source code. It’s a beast to develop for properly and, commercially, why most Saturn games looked like crap outside of in-house. Most developers targeted one or the other processor and left it at that; undercutting the platform who’s specs remain (albeit low end entry), acceptable in today’s advanced world. Weird stuff.
For lighting you could pick up case lighting from a computer shop and some parts for a switch from an electrical store; and rig up a system to run it off a watch battery.
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