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CPU
ASCII Corporation

R800

Processor

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System configuration

Detailed specifications

Specifications 1 · 4 fields
Data paths and clocks
ALU width
16* bit
Data bus
8* bit
MSX implementation CPU clock
14.32* MHz
MSX implementation bus clock
7.16* MHz
Processor design
Designer
ASCII Corporation*
Manufacturer
Mitsui & Co*
System
MSX Turbo-R*
Instruction compatibility and extensions
Instruction family
Z80-compatible*
Multiply instructions
  • Instruction
    MULUB*
    Width
    8* bit
  • Instruction
    MULUW*
    Width
    16* bit
Fast-RAM refresh timing
Refresh interval
30* µs
Refresh pause
4* µs
Scope
Turbo-R fast RAM; cartridge and ROM timing can differ*
Specifications 2 · 1 fields
Manufacturer
ASCII Corporation*

* Provisional data