I built an IMSAI 8080 kit
by Jim Baber - 7/14/07 6:52 AM
In Reply to: My first computer by timelord1960
Early 70's I think... I had been a programmer since 1964, and read as much computer stuff as I could get a hold of, so when the Imsai kit was announced I had to have it. My wife was a programmer also which made it easier to justify the high cost of my hobby. I had been a Design Engineer in the design labs at NCR working on their early mainframe computers in 1960, so the idea of assembling a kit computer didn't bother me at all.
My IMSAI 8080 (serial # 17) was a S100 bus machine with an Intel 8080 processor. It initially used front panel switches to load a boot up program in binary form (a real pain), that in turn could access THE only I/O device I had at first, a Teletype KSR unit. The kit had 1 memory board with 4 K of RAM originally, that I eventually maxed out at 64 K.
I eventually added 4 of the 8" double sided floppy disk drives as well as a kit built keyboard, a monochrome monitor, 1200 baud modem, and an Anadex dot matrix printer. This all became a good little machine including Digital Research's CPM for it's operating system.
I finally built my 1st "PC style" machine with MS DOS in 1985, and am still reluctantly in the camp of M$. Every once in a while I'll dip my toe into the linux pond, but I've avoided jumping in, and at 70, I doubt I will.
Was this reply helpful? (0) (0)