R800
Sign in to saveright|thumb|R800 The R800 is the central processing unit used in the MSX Turbo-R home computer. The R800 was designed by ASCII Corporation of Japan and built by Mitsui & Co The goal was a modern and pipelined CPU binary compatible with the Z80, and therefore with MSX software, while also maintaining compatibility with older MSX Z80-based hardware.
~4 min read
Article
6 sectionsContents
- Compatibility
- Hardware changes
- Fetching opcodes
- External hardware
- References
- Further reading
right|thumb|R800 The R800 is the central processing unit used in the MSX Turbo-R home computer. The R800 was designed by ASCII Corporation of Japan and built by Mitsui & Co The goal was a modern and pipelined CPU binary compatible with the Z80, and therefore with MSX software, while also maintaining compatibility with older MSX Z80-based hardware.
==Compatibility== During the development of the MSX Turbo R, ASCII Corporation considered various processors, both compatible and incompatible with the Z80, as candidates. At that time, Kazuya Kishioka , a company employee, was researching and developing an ASIC that was a high-speed version of the Z80 and largely customized for the MSX architecture.