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  1. C

    pdp-8/e address won't increment

    I am trying to get a pdp-8/e working. I have replaced the core memory with a single, new semiconductor memory board (http://tronola.com/html/ram_for_pdp-8e.html). I can load an address, deposit something in it, examine it, but the address does not increment when I use the deposit or examine...
    • chapmro
    • Thread
    • Replies: 4
    • Forum: DEC
  2. C

    Where to look for signs of life on model 4 main board?

    I am trying to repair a model 4 with a dark screen. I posted earlier about the video board, but in absence of a way to debug that, I thought I'd work backwards. I looked on the scope at the 3 outputs from the main board to the video board. The H sync and V sync pulses are there, but I am not...
  3. C

    TRS-80 model 4 video problem.

    I was given a Model 4 which keeps blowing the video board fuse. I was told that something "shorted" in the power supply (who knows?). The power supply fuse does not blow, and if you disconnect the PS and give it AC, the output voltages look ok. If you hook up everything except the connector to...
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