Language TI80, T6M53

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The Texas Instruments TI 80 is a graphing calculator built around a 4-bit microcontroller, the Toshiba T6M53.

Randy Compton placed some documentation online.

Complications:

• Addresses sometimes have offsets.
• Some instructions overlap, but not as a conflict. It's a signal to perform both operations!
• Some addresses are offset, 0x100 higher than implied by the bits.
• Code is big endian, data is little endian.