bender@oobleck.Eng.Sun.COM (memory fault - core dumped) (06/22/91)
Well, thanks to all of the responses that I received to my XTAL oscillator question (got about 10 of them!). What I finally ended up doing was installing a 24 MhZ can oscillator and using the inverters there just as buffers, removing all of the other stuff around them. I turned the emulator on and scoped out the output of the inverters, and also the D f/f that's later in the chain (to give me a 12 MhZ processor clock) and everything looks fine. Most of the responses that I got said that the oscillator design would be pretty unstable, and not to even bother with a new crystal but to use a can oscillator instead. To be fair to American Automation, the designers of the emulator, the emulator pod that I'm using that contains the processor clock among other things is an old board (1985 vintage) and they have since been shipping an updated pod. In all, the emulator itself is a good piece of work. I remember doing some code on a "real" INTEL 8051 emulator (ICE-51) running on a "blue box" (system 3?? ISIS OS, 2 8" disk drives, CREDIT, remember that!) but I don't seem to remember that INTEL used a bonded-out 8051 in their emulator, like the AA unit does - anyone familiar with how INTEL's 8051 ICE is architected? Thanks again for all of the e-mail! mike -- ------------------------------------------------------------------------ 1985 Honda Shadow VT1100 | DOD #000007 1989 Honda NX-650 | AMA #511250