TMS-0980


Some electronic games and calculators from the mid-70s use a variant of the Texas Instruments TMS-1000/TMS-1100 known as the TMS-0980. Some examples are Stop Thief, TI-30, TI Programmer and TI Business Analyst I. The die is similar to the TMS-1100, but it has 2K of 9-bit ROM and 144 4-bit nibbles of RAM. The pinout is slightly different. Here is a diagram of the chip from US patent 4115705.

The ROM bits are physically arranged similarly to the TMS-1100; the bit and page order in each row is the same, but the row order is simplified- the rows are in byte order, from 00 at the top to 7F at the bottom.


Stop Thief game

Parker Brothers electronic detective game.

Hardware description and pinout

Patent with schematic and object code

ROM dump- 9/16 of this dump matches the patent. I'm not sure if the difference is due to a change in code, or if I'm mapping some of the bits incorrectly.

raw ROM dump

ROM dump from patent

picture of ROM array

full die shot after acid


TI-30 calculator

Texas Instruments scientific calculator.

Hardware description and pinout

one of many patents - see more here

ROM dump

raw ROM dump

picture of ROM array

full die shot top metal

full die shot after acid


TI Programmer calculator

Basic calculator with hex/octal conversions.

Hardware description and pinout

ROM dump

raw ROM dump

picture of ROM array

full die shot top metal

full die shot after acid


TI Business Analyst I calculator

Texas Instrument calculator with some financial and statistical functions.

Hardware description and pinout

ROM dump

raw ROM dump

picture of ROM array

full die shot top metal

full die shot after acid


Ideal Electronic Detective

Board Game

Hardware description and pinout

ROM dump

raw ROM dump

picture of ROM array

picture of ROM array with top metal layer removed

picture of output PLA

picture of ROM word decoder and instruction PLA

picture of fixed instruction decoder

full die shot top metal


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