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  • wa2flq's Avatar
    Yesterday, 12:55 PM
    wa2flq replied to a thread PDP-11/44 Restoration (part 2) in DEC
    A linear version would weigh about 5 times a switcher. This is definitely a complex Switching PSU. A mid 1970's design, it had to deal with...
    14 replies | 494 view(s)
  • wa2flq's Avatar
    July 7th, 2020, 08:04 PM
    wa2flq replied to a thread PDP-11/44 Restoration (part 2) in DEC
    According to EK-BA11A-TM-003_Aug83 the H7140 has a minimum draw of 6A on the +5.1 V supply and 0.0 on the rest. So you could reduce the load a bit,...
    14 replies | 494 view(s)
  • wa2flq's Avatar
    July 5th, 2020, 11:46 AM
    wa2flq replied to a thread PDP-11/44 Restoration (part 2) in DEC
    For the Q-Bus "The maximum allowable current per pin is 1.5 A" according to...
    14 replies | 494 view(s)
  • m_thompson's Avatar
    July 4th, 2020, 03:24 PM
    Make a load board for the other voltages that plugs into a backplane slot?
    14 replies | 494 view(s)
  • m_thompson's Avatar
    July 4th, 2020, 07:11 AM
    I think that about a 20% load on the voltages would be enough to debug the power supply.
    14 replies | 494 view(s)
  • m_thompson's Avatar
    July 3rd, 2020, 04:00 PM
    I would 2) build the dummy load and observe the system under the test conditions some more >One capacitor on the memory regulator board read a...
    14 replies | 494 view(s)
  • wa2flq's Avatar
    June 26th, 2020, 10:36 AM
    wa2flq replied to a thread learning RT11 in simh in DEC
    Good to see you sorted this out. PCX.SYS shouldn't be hard to add if you have a basic system. See if you have PC.MAC It's the smallest device...
    14 replies | 713 view(s)
  • wa2flq's Avatar
    June 25th, 2020, 06:27 PM
    wa2flq replied to a thread learning RT11 in simh in DEC
    Try .install pc Before running the command. If this doesn't work, do a .show device This will tell what devices are seen by the system...
    14 replies | 713 view(s)
  • m_thompson's Avatar
    June 19th, 2020, 01:01 PM
    m_thompson started a thread VAX 11/750 for the RICM in DEC
    We picked up a recently donated VAX 11/750 Saturday. The cabinet that contained the RA60 was a mess from mice living in it so we removed the RA60,...
    0 replies | 166 view(s)
  • wa2flq's Avatar
    June 15th, 2020, 01:53 PM
    wa2flq replied to a thread PDP8/F new toy, knobs wanted in DEC
    Complements on sorting out all the issues. Some advice with regards to the additional ground wire soldered directly to the ground plane. If...
    9 replies | 1128 view(s)
  • wa2flq's Avatar
    June 12th, 2020, 08:53 AM
    The MXV11 looks like a M7195 (MXV11-B) which has 128K (if enabled), is 22bit compatible and features a myriad of configuration jumpers. As this...
    36 replies | 2025 view(s)
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About jackrubin

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About jackrubin
Biography:
Started computing in 1959 (GENIAC), still trying to figure things out
Location:
Wilmette, IL (north of Chicago)
Interests:
CP/M, PDP8 & 11, RTTY
Occupation:
Stay-at-home computer dad

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Recent Entries

DEC extender adapter for over-the-top OMNIBUS boards

by jackrubin on June 30th, 2017 at 01:50 PM
Quote Originally Posted by jackrubin View Post
Revision 2 just arrived - smaller board, no vias. Based on how hard I had to smack the connectors with the hammer, I've opened the holes up a little in the next batch. First cable set goes out for testing tomorrow.





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