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This is a primitive disassembler for KS10 microcode. Build and execute like so: make ./udis < ram.262 By default, microinstructions are disassembled in the order they appear in memory. However, by #defining PROGRAM_ORDER in udis.c, the disassembler will follow the J field. Also, I've tried to dissassemble instructions that may be skipped to by means of the SKIP field, though I'm not sure if I got it right. The files mcr.262 and ram.262 are the ITS KS10 microcode assembler listing, and binary RAM file, respectively. source.262 is the microcode source code, reconstructed from mcr.262. There is no support for KL10 microcode, though it should be possible to add without too much hassle.