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A > ASCI > SystemX   


The ASCI SystemX, also called U68 was a single board training system that was used in an educational environment during the early 1980s.

It was mounted in a wooden box and covered with a smoke colored plastic lid. When it was closed, all the electronic part was covered, except the 16 key hexadecimal keypad and a seven digit LED display.

The main board featured a Motorola 6800 processor and an Exorciser bus connector. Several I/O boards could be connected to the system allowing microprocessor based experiments.

Motorola 6800 is a 8-bit microprocessor which was released at about the same time as Intel 8080. The 6800 had 16-bit address bus and could address up to 64 KB of memory. From common registers the CPU had only two accumulators and one index register. The 6800 didn't have I/O instructions and therefore 6800-based systems had to use memory-mapped I/O for input/output capabilities. Motorola 6800 started the big family of 680x microcontrolers and microprocessors, some of which are still produced today.

NAME  SystemX
TYPE  Home Computer
YEAR  1979
KEYBOARD  Hexadecimal 16 keys keypad + NMI and RESET pushbuttons
CPU  Motorola 6800
SPEED  1 MHz, 1.5 MHz with a Fairchild version of the 6800 CPU
RAM  Unknown
TEXT MODES  Hexadecimal 7 digit display
SIZE / WEIGHT  30(W) x 25(D) x 5(H) cm.
I/O PORTS  Exorciser bus, I/O, Serial
BUILT IN MEDIA  Additional tape recorder card
OS  Hexadecimal monitor
POWER SUPPLY  External power supply unit
PERIPHERALS  Several I/O cards
PRICE  Unknown

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