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tms 9900
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tms 9900 : FOLDOC
TMS 9900
One of the first true 16-bit microprocessors, released by Texas Instruments in June 1976 (the first are probably National Semiconductor {IMP-16} or {AMD-2901} {bit slice processors} in 16-bit configuration). It was designed as a single chip version of the {TI 990} minicomputer series, much like the Intersil 6100 was a single chip PDP-8, and the {Fairchild 9440} and Data General mN601 were both one chip versions of Data General's Nova. Unlike the IMS 6100, however, the TMS 9900 had a mature, well thought out design.
It had a 15-bit address space and two internal 16 bit registers. One unique feature was that all user registers were actually kept in memory - this included {stack pointers} and the program counter. A single workspace register pointed to the 16 register set in RAM, so when a subroutine was entered or an interrupt was processed, only the single workspace register had to be


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