TI-55, -57, MBA
Impressive technology in its day, a single TMC1500 series chip powered each of these programmable machines.
Datamath Calculator Museum
The ROMs were packed so tightly that a few quirks show through. See my articles:
Hidden Opcodes on the TI-55
The TI-57 Memory Map
Conditional Branching with the TI-MBA
The TI-57 Constant ROM
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