Texas Instruments TMS1000 family of 4-bit microcontrollers was
introduced in 1974. The TMS 1000 microcontrollers had very simple design -
only 2 4-bit general registers, 43 instructions (expanded to 54 instructions
in TMS1100/TMS1300), 1-level deep stack, shift-register program counter and
no interrupts.
The TMS1000/TMS1070 were basic microcontrollers with 1 KB of
masked ROM and 64 x 4 bits of RAM. ROM and RAM memory size was doubled on
TMS1100 microcontrollers.
TMS1200/TMS1270/TMS1300 microcontrollers were similar to TMS1000/TMS1070/TMS1100
respectively, but had more output lines. The TMS1070 and TMS1270 could directly
interface to high voltage displays.
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