On Wed, 14 May 2025, [email protected] wrote:
Mark, for both the S/370 and S/3 "emulation" we found the opcode jump tables for the 5100/5110 (I don't think I posted those anywhere, but mentioned in the VCF 5100 talk). While each opcode 00-FF has an entry, as you say many of them jump to effectively a halt or invalid instruction placeholder (or in other words, only about 80% of the opcodes actually being supported).
I had disassembled and partially documented the 5110 S/3 (basicros.asm) and S/360 (aplros.asm) emulators many years ago. The listings are publicly available on our servers since 2008.
Christian
