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  • cruff's Avatar
    August 7th, 2019, 03:29 PM
    I expect it is relying on the Z80 to run the DRAM refresh cycles. That is hinted at in the restriction of the longest DMA burst latency in the...
    24 replies | 569 view(s)
  • cruff's Avatar
    July 31st, 2019, 03:30 PM
    cruff replied to a thread Atex PDP-11/34 in DEC
    You need to concentrate on identifying which serial port is the ODT console port that the J-11 CPU will talk to if it is configured to enter ODT at...
    28 replies | 1702 view(s)
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Atex PDP-11/34

by cruff on July 2nd, 2019 at 05:57 PM
If you have an oscilloscope, that would give you a lot of flexibility in problem solving. If not, can you get ahold of some type of RS-232 breakout box with LED indicators, or something like I bought years ago RS-232 CHECK TESTER, that could work to determine if there was some signal activity on a port. The only problem would be if the amount of data being written to the port was small, you might need a slow motion video to detect the LEDs blinking