Their recollections can be confirmed and expanded by magazine and journal articles written at the time. In 2008 the Computer History Museum interviewed four members of the 6800 microprocessor design team. Motorola did not chronicle the development of the 6800 microprocessor the way that Intel did for their microprocessors. The Motorola 6809 was an updated compatible design.īlock diagram of a M6800 microcomputer system The MC6801 and MC6805 included RAM, ROM and I/O on a single chip and were popular in automotive applications. The MC6802, introduced in 1977, included 128 bytes of RAM and an internal clock oscillator on chip. It also found use in arcade games and pinball machines. The 6800 was popular in computer peripherals, test equipment applications and point-of-sale terminals. An expansive documentation package included datasheets on all ICs, two assembly language programming manuals, and a 700-page application manual that showed how to design a point-of-sale computer terminal.
The Motorola EXORciser was a desktop computer built with the M6800 ICs that could be used for prototyping and debugging new designs. The customer could use the software on a remote timeshare computer or on an in-house minicomputer system. In addition to the ICs, Motorola also provided a complete assembly language development system.
Later versions had a maximum clock frequency of 2 MHz. The original MC6800 could have a clock frequency of up to 1 MHz. It has 72 instructions with seven addressing modes for a total of 197 opcodes. The 6800 has a 16-bit address bus that can directly access 64 KB of memory and an 8-bit bi-directional data bus. The M6800 Microcomputer System was announced in March 1974 and was in full production by the end of that year. A significant design feature was that the M6800 family of ICs required only a single five-volt power supply at a time when most other microprocessors required three voltages. The MC6800 microprocessor was part of the M6800 Microcomputer System that also included serial and parallel interface ICs, RAM, ROM and other support chips. The 6800 (" sixty-eight hundred") is an 8-bit microprocessor designed and first manufactured by Motorola in 1974.
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