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  • m_thompson's Avatar
    Yesterday, 03:37 AM
    m_thompson replied to a thread DEC RA81 Drive in DEC
    I have successfully used drives with bearings that were more noisy. I would run the drive for a few hours and see if the noise gets better or worse.
    15 replies | 338 view(s)
  • m_thompson's Avatar
    Yesterday, 03:35 AM
    m_thompson replied to a thread PDP-11/34 and PDP-11/73 in DEC
    I have the same SMD drive chassis that came with a VAX. I borrowed one of the drives for my Sun 2/120.
    23 replies | 591 view(s)
  • m_thompson's Avatar
    March 21st, 2019, 03:59 PM
    m_thompson replied to a thread DEC RA81 Drive in DEC
    Have you tried connecting a serial terminal to the diagnostic port, and then running some of the tests? I have one of the special hand-held...
    15 replies | 338 view(s)
  • m_thompson's Avatar
    March 21st, 2019, 03:37 AM
    m_thompson replied to a thread PDP-11/34 and PDP-11/73 in DEC
    It depends on the machine that the RH11 is in. In a KS10, the RH11 will support the RM02, RM03, RP06, and RM80.
    23 replies | 591 view(s)
  • Ed Groenenberg's Avatar
    March 21st, 2019, 01:21 AM
    Ed Groenenberg replied to a thread PDP-11/34 and PDP-11/73 in DEC
    Yes indeed, only the RM02 is usable with the RH11, as it runs at 3000 rpm, rather than 3600 rpm. Not sure if the RA80 is able to work on a RH11 tough.
    23 replies | 591 view(s)
  • m_thompson's Avatar
    March 20th, 2019, 07:32 AM
    Our Museum probably has the largest collection of Wang equipment in the USA. I often visit Karlsruhe. Are you near there?
    3 replies | 148 view(s)
  • m_thompson's Avatar
    March 20th, 2019, 05:43 AM
    m_thompson replied to a thread DEC RA81 Drive in DEC
    There were to HDAs for the RA80 & RA81. The originals are painted a greyish tan had a very high failure rate. The new HDAs are black. We have seen...
    15 replies | 338 view(s)
  • m_thompson's Avatar
    March 20th, 2019, 05:40 AM
    m_thompson replied to a thread PDP-11/34 and PDP-11/73 in DEC
    The RICM received an RM05 controller few weeks ago. It is about the same size as the 9766 disk drive, and really heavy.
    23 replies | 591 view(s)
  • Ed Groenenberg's Avatar
    March 20th, 2019, 05:11 AM
    Ed Groenenberg replied to a thread DEC RA81 Drive in DEC
    Now, THAT's a very ingenious solution to move computer equipment on a staircase!
    15 replies | 338 view(s)
  • Ed Groenenberg's Avatar
    March 20th, 2019, 05:09 AM
    Ed Groenenberg replied to a thread PDP-11/34 and PDP-11/73 in DEC
    Unlike the RM03, the RM05 uses a separate, cabinet sized controller, so if it 'just' the drive itself, it would be only useful for someone who has...
    23 replies | 591 view(s)
  • m_thompson's Avatar
    March 18th, 2019, 04:01 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We measured the input and output signals of the bad B131 module and the adjacent good modules. On the bad B131 module the SUM output on pin V was a...
    28 replies | 1721 view(s)
  • Lou - N2MIY's Avatar
    March 18th, 2019, 03:00 AM
    The Gotek works out of the box on the RQDX3 as an RX33. There was a thread here a few years back that quite a few of us participated in. We also...
    3 replies | 155 view(s)
  • wa2flq's Avatar
    March 12th, 2019, 06:07 AM
    I haven't run an VT100 emulator on a windows machine in a while, but the following are the typical things I check. Make sure the...
    22 replies | 2100 view(s)
  • m_thompson's Avatar
    March 11th, 2019, 03:59 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The attached image shows the organization of the PDP-9 processor. Since the stuck bit-9 shows up in all of the registers the problem was most likely...
    28 replies | 1721 view(s)
  • m_thompson's Avatar
    March 10th, 2019, 06:44 AM
    Where is the museum located?
    3 replies | 148 view(s)
  • m_thompson's Avatar
    March 10th, 2019, 06:19 AM
    Yesterday, while digging through a box of PDP-9 documentation at the RICM, I found a TU60 tape with PDP-11 software on it.
    7 replies | 327 view(s)
  • Lou - N2MIY's Avatar
    March 9th, 2019, 06:51 AM
    Another factor that is pulling the value of your Rainbow down Alan, is that it also likely lacks the color graphics option. Since you only have the...
    7 replies | 302 view(s)
  • Lou - N2MIY's Avatar
    March 8th, 2019, 03:14 PM
    This is almost as bare bones as a system could get. It was a CAPS-11 system. CAPS-11 is really slow, because the TU60 is really slow. You'll see...
    7 replies | 327 view(s)
  • m_thompson's Avatar
    March 8th, 2019, 07:11 AM
    That would be a fun restoration project. Not such a bad price.
    7 replies | 327 view(s)
  • Lou - N2MIY's Avatar
    March 8th, 2019, 02:20 AM
    That is about what I was thinking as well. Anyone really wanting a Rainbow will wait / pay for a machine with Drive W:. Good luck finding the option...
    7 replies | 302 view(s)
  • Lou - N2MIY's Avatar
    March 5th, 2019, 04:48 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    So after sorting through a bunch more floppies, I was able to come up with about six error-free sides to start with. The process involved punching...
    16 replies | 806 view(s)
  • m_thompson's Avatar
    March 3rd, 2019, 06:11 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We powered up the DEC PDP-9 on Saturday and tried some simple functions. We can write/read core, and executed back-to-back JMP instructions. Since...
    28 replies | 1721 view(s)
  • Lou - N2MIY's Avatar
    March 3rd, 2019, 04:49 AM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    The RX02 was all DEC, just like the RX50. Some earlier RX01 drives have transports that were made by CalComp, but the surrounding sheetmetal and...
    16 replies | 806 view(s)
  • Lou - N2MIY's Avatar
    March 2nd, 2019, 02:11 PM
    Lou - N2MIY replied to a thread DEC VT-278 Find in DEC
    We made some progress today. I made my own BC26P, which connects two RX drives to the DECMate. I connected two teacart RX02 drives and was able to...
    16 replies | 806 view(s)
  • wa2flq's Avatar
    March 1st, 2019, 06:39 PM
    Compare the results of a SHOW CONFIG from the XM boot with the contents of the XM.mac file. There is a mismatch in configuration options,...
    4 replies | 259 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 05:52 AM
    Thanks!
    30 replies | 2220 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 05:14 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Whoops - missed the edit window - and also here: http://www.computerarium.org/doku/doku.php?id=rk05_disk_drives
    28 replies | 1721 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 04:49 AM
    Please flip the bags over so we can see the part numbers!
    30 replies | 2220 view(s)
  • jackrubin's Avatar
    March 1st, 2019, 04:39 AM
    jackrubin replied to a thread PDP-9 at the RICM in DEC
    Mmm ... maybe time for a new thread? Or this old one - http://www.vcfed.org/forum/showthread.php?49142-RK05-RK8E-Restoration
    28 replies | 1721 view(s)
  • m_thompson's Avatar
    March 1st, 2019, 03:44 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I used self adhesive foam weather strip that I bought at the local hardware store. Two layers of 3/4" x 7/16" worked for the blower. One layer of...
    28 replies | 1721 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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