Some electronic games and calculators from the mid-70s use a variant of the Texas Instruments TMS-1000/TMS-1100 known as the TMS-1980. Some examples are DataMan, TI-45, and Math Marvel. The die is similar to the TMS-1100, but it has 2K of 9-bit ROM and 144 4-bit nibbles of RAM, and uses a VFD instead of LEDs. The pinout is slightly different.
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.
Texas Instruments educational toy.
Hardware description and pinout
patent with schematic and source code
transcription of patent object code
Texas Instruments educational toy.
Hardware description and pinout
full die shot with top metal removed
picture of ROM array with top metal removed
