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RE: [midatlanticretro] Cromemco People in the Audience?

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  • B. Degnan
    Bill, Thanks. I will let you know. Bill
    Message 1 of 5 , Dec 1 5:44 AM
      Thanks. I will let you know.

      At 06:53 AM 12/1/2006 -0500, you wrote:
      >The 16FDC design calls for lower density masked ROMs. As the higher density
      >ROMs got cheaper, cormemco switched over to using them. The pins that are
      >tied together are just unused address pins on the high density ROM. Things
      >1 make sure that the "start address" switches on the ZPU are set correctly
      >2 make sure that you are using the right DB25 connector (should be just a
      > through cable) and that the cable to your terminal is "right way around",
      >that is
      > the TXD/RXD orientation of pins 2 and 3. I can never remember when you
      > DCE (Data Computer Equipment) or DTE (Data Terminal Equipment). You
      > only need TXD, RXD and ground (pin 7) between the computer and the
      > Try sticking a NULL modem converter in the path and see if that helps.
      >3 leave out everything except the ZPU, 16FDC and the 64KZ
      >4 be sure the 64KZ is set to bank 0 (zero)
      >5 check voltage levels on the bus
      >6 gently "rock" (ease out and reinsert) socketed chips, especially TI (Texas
      > Instruments) chips with tarnished pins.
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