TI 990 architecture / was Re: TI-99/4A Floppies
Peter C. Wallace
pcw at mesanet.com
Wed Oct 3 12:13:12 CDT 2007
> Actually 1980 was mid to late in the life of the TI9900 chip. The first
> one I worked with was on a Technico Superstarter System, TI9900, 2k ram,
> 1k prom (monitor ans line by line asm) and a 2708 eprom programmer on
> one board. I still have it. I purchased it at PCC '78 in in memory
> serves Philly. Fir the amount of resource on the board it was pretty
> capable for systems of that day.
That sure brings back memories. I also had a Technico SuperStarter (Two bytes
are better than one!) Eventually made a wire wrapped 32 KByte RAM card (using
TMS4060 non muxed 4K DRAMS), a 256x256 graphic display, A wire wrapped floppy
controller (8 inch with 16 KByte DRAM track buffer). The floppy was a
revelation after waiting for the papertape version of EAL (Editor Assembler
Linker?) to load.
>> (Cheriton left before we actually got into using them at the software level
>> and the distributed kernel would become the VKernel at Stanford on other hardware).
>> Also, the description of the 9900 in Osborne's "An Introduction to
>> Microcomputers, Vol II" ('76) fits well with my recollections of the 990/10.
I think I chose the 9900 based on the Osborne book, it had the shortest
Interestingly TI's MSP430 has an instruction set reminiscent of the 9900
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