computer built by Sol Libes, and his students, in 1973
computer used the Intel 8008, the first 8-bit microprocessor.
The system had 1KB of static RAM, a bus system for
expansion, 1 parallell input/output port for process
control, and one serial port for connection to an ASR33 Teletype.
The microprocessor was very primative and lacked a memory
stack and interrupts, introduced later with the Intel 8080.
circuitry was designed by Johnathan Titus, a graduate student at
Virginia Polytechnic Institute. Titus wrote a
construction article that appeared in Radio-Electronics magazine.
He called the computer the Mark-8.
computer had a front panel with LEDs to display the memory address, the
contents of the registers, and control functions. It
was built using a chassis, power supplies, switches, and lamps from an
old obsolete GE mainframe computer.
The system was
used for process control experiments. Programs, written in
hexidecimal code, were entered using the switches and lights
on the control panel A small program was written to load and
store programs from, and to, the Teletype.
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