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  • cruff's Avatar
    July 14th, 2019, 03:53 AM
    cruff replied to a thread VAX 7000-640 CPU frequency in DEC
    I ran it from a telnet session on 7.3 and it wrote its output to my telnet session without problem.
    39 replies | 2988 view(s)
  • cruff's Avatar
    July 12th, 2019, 04:47 AM
    cruff replied to a thread VAX 7000-640 CPU frequency in DEC
    Here are the numbers for a VAXstation 4000/60 running OpenVMS 7.3: 0000.0300 0001.1700 0008.7002
    39 replies | 2988 view(s)
  • cruff's Avatar
    July 9th, 2019, 03:33 AM
    cruff replied to a thread Atex PDP-11/34 in DEC
    Did you measure across the -15 V and +15 V lines? If so, then 30 V would be correct since there would be a 30 V potential across both. You need to...
    24 replies | 897 view(s)
  • cruff's Avatar
    July 2nd, 2019, 05:59 PM
    cruff replied to a thread Atex PDP-11/34 in DEC
    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...
    24 replies | 897 view(s)
  • cruff's Avatar
    July 2nd, 2019, 05:57 PM
    cruff created a blog entry Atex PDP-11/34 in cruff
    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...
    1 replies | 679 view(s)
  • cruff's Avatar
    July 1st, 2019, 03:58 PM
    cruff replied to a thread Atex PDP-11/34 in DEC
    Was everything cabled up when you got the system? If so, you did record where every cable went? Is there a DLART on the CPU board? That will...
    24 replies | 897 view(s)
  • cruff's Avatar
    July 1st, 2019, 03:35 AM
    cruff replied to a thread Atex PDP-11/34 in DEC
    The panel board marked Workstation III/LAN mentions Thinnet and AUI, which are commonly used to describe Ethernet cable variants. If you get an AUI...
    24 replies | 897 view(s)
  • cruff's Avatar
    June 30th, 2019, 10:57 AM
    cruff replied to a thread Atex PDP-11/34 in DEC
    Since the CPU board has a J-11 on it, it will have built in ODT, which if you can figure out how to configure the board to set the power up mode bits...
    24 replies | 897 view(s)
  • cruff's Avatar
    June 24th, 2019, 03:50 PM
    I am now pursuing this for the HP 98x5 series of computers after I was not able to get my 98035A clock interface to an operational state after the...
    14 replies | 1098 view(s)
  • cruff's Avatar
    June 23rd, 2019, 11:57 AM
    You can scavenge key parts from some of the old TI-99/4 home computers, and possibly other keyboards from that time frame. The key caps can be...
    3 replies | 258 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
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