TRS-80 Model 4
|TRS-80 Model 4 from 1983
||Z80A @ 4MHz
||2 half height DSDD
||12" amber CRT
||serial, Centronics parallel, cassette, system bus, external floppy
||Level II BASIC in ROM, Montezuma Micro CP/M 2.2
||I purchased this system in 1984 from a 3rd party vendor, and it
contains non-Tandy diskette drives. I also hated the flickering white screen,
so I replaced the tube with a long persistence amber screen from Langley St.
Clair. A problem arose during power off, when the shrinking spot on the
display eventually burned the phospor at the center of the display. I ended
up adding a second power switch to kill power to the monitor before shutting
off power to the CPU.
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Last updated on
Tuesday, November 30, 2010