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System 801 Principles of Operation, Version 2 describes a byte-addressable machine with 16 24-bit GPRs and a mix of 16-bit and 32-bit instructions.
Other papers speak of a machine with 32 32-bit GPRs and 32-bit instructions.
ROMP is described by IBM as "a single-chip derivative of the 801 processor project of IBM Research"; it started out with 16 24-bit registers, went to 16 32-bits registers, and had multiple instruction lengths.
So are there any references for:
In Computer Wars: How the West Can Win in a Post-IBM World on p. 49, IBM is said to have tried to commercialize the 801 as something that could emulate and outperform various IBM minicomputers and low-end S/370s. The book goes on to say it was eventually cancelled because emulation imposed too great a performance penalty for it to work. Is the project described in this book (code-named Fort Knox) related to the IBM 9370 low-end S/370 mainframes? (IBM says the 9370 uses some sort of 801-derived processor to emulate the S/370 architecture). 99Electrons ( talk) 23:40, 25 February 2019 (UTC)