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.
BUILT IN LANGUAGE
Hexadecimal 16 keys keypad + NMI and RESET pushbuttons
1 MHz, 1.5 MHz with a Fairchild version of the 6800 CPU