Grandfather system RTE6/VM?

More on the topic. Thanks, Al, for the microcode rom dumps (however the 12823-80020.bin, F-SIS is missing - lost somehow during copying?). I've seen that the base ROMs slightly differ from the microcode listing in the 2109-90004_1000EF_uPrgRef_Apr80.pdf from your site. What is the relation between both sets? I've hacked together a simple microcode disassembler for these ROMs, with the exception of the 1816-* ROMs that I do not know how to handle (any further info?). This code is fully public domain (not even GPLd) (dis_rom.c). You can find it and its output, when used on the ROM dumps, at: ftp://xfreeos2.dyndns.org/pub/misc/hp The F-SIS listing will follow once I get the missing dump above. Compile as usual: gcc -o disrom dis_rom.c Usage is: disrom oct_baseaddr rom_at_0_7 rom_at_8_15 rom_at_16_23, e.g. disrom 06000 12824-80007.bin 12824-80008.bin 12824-80009.bin >vis.lst for the VIS instruction set. I'll have a look at the microcode and will see what those obscure RTE6 extensions and other stuff really does. Don't stay tuned yet, but expect some more info in the future. Holger