Hi, I am new on this list, but not new with simh.
I assisted Dutch Owen in writing his System/3 model 10 emulator, which I modified later to a model 15D emulator. I have now started a new project: an IBM system/32 simh emulator. The S/32 has two storages: - Control Storage: This storage is 4 kiloword large and contains micro-instructions for the S/3 instruction set emulator and the IOS. (The S/32 CPU is hardwired, not micro-coded) These micro-instructions have all a fixed length of 16 bits. - Main Storage: This storage is 32 kilobyte and contains the SCP written in S/3 machine code. These two storages are in different spaces. First dilemma: what should be the "main storage" from a simh point of view ? The CPU executes micro instructions from CS, so imho it should be CS. With: sim> e 0-15 the content of the first 16 words in CS should be displayed. But what to do with the Main Storage ?. For this storage I also need a "examine" command. Adding a CS/MS parameter to the "e" command is an option. Seperate switch that selects CS or MS (the real S/32 has one) would be the right option I think. But how can I troggle (dynamic) between 8 or 16 bit data paths in simh ? Q1: What is the best way to implement operator panel troggle switches in simh ? I need them for: - selecting CS / MS for display / altering storage. - selecting IMPL CS or IPL from MS. Q2: How can I display (with the "examine" command) in simh _bytes_ in Main Storage mode and _words_ in CS mode ? Example: sim> troggle sw to CS sim> e 1 1: 5246 sim> troggle sw to MS sim> e 1 1: CE Thanks for any tips or suggestions. Regards Henk _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
