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  • m_thompson's Avatar
    Yesterday, 03:45 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Today, after lots of false leads, we found that the signal from the processor that tells the TU55 DECtape drives to stop moving when the processor...
    63 replies | 7942 view(s)
  • MattisLind's Avatar
    July 20th, 2019, 11:37 AM
    I see some bipolar PROM numbers like 7611 and 82S185. Bipolar PROMs are quite common in seventies and eighties equipment. And are getting harder to...
    9 replies | 299 view(s)
  • MattisLind's Avatar
    July 18th, 2019, 08:34 AM
    There was an ad on a Norwegian ad site site for a old computer. An ICL PERQ. It was only 75 USD so I got a friend of mine in Oslo purchase it and...
    2 replies | 63 view(s)
  • MattisLind's Avatar
    July 18th, 2019, 08:20 AM
    The horisontal scan frequency of the original HP 35731 monitor is 24.9 - 25.8 kHz. Does your Zenith cope with that? Look here for more...
    2 replies | 54 view(s)
  • m_thompson's Avatar
    July 14th, 2019, 09:06 AM
    m_thompson replied to a thread New to me PDP-11/53 in DEC
    That is the CPU that I have. The Dataram board has 4x columns of 18 RAM chips. The RAM chips are Micron 1259-12, so that makes it 1MW with parity...
    7 replies | 297 view(s)
  • m_thompson's Avatar
    July 14th, 2019, 06:25 AM
    You can find the manuals for the 8/e here: http://www.bitsavers.org/pdf/dec/pdp8/pdp8e/ You can start by removing all of the boards and testing...
    1 replies | 111 view(s)
  • m_thompson's Avatar
    July 14th, 2019, 06:18 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Too many visitors yesterday to get much done on the TC02. We are still getting the END error after we send a MOVE command to the TC02 and the tape...
    63 replies | 7942 view(s)
  • m_thompson's Avatar
    July 11th, 2019, 03:08 PM
    Vincent made replacement switch and lamp PCBs for the 8/I. http://so-much-stuff.com/pdp8/frontpanel/frontpanel.php
    172 replies | 14144 view(s)
  • MattisLind's Avatar
    July 8th, 2019, 01:41 AM
    Here is the scan: http://storage.datormuseum.se/u/96935524/Datormusuem/DEC/MAINDEC-08-DIVTC-A-D_VT55_ACCEPTANCE_TEST.pdf Add the binary later on....
    13 replies | 722 view(s)
  • m_thompson's Avatar
    July 7th, 2019, 04:48 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We replaced a defective S107 inverter FlipFlop. The control signals to the TU55 DECtape look better, but we are still getting the END error and the...
    63 replies | 7942 view(s)
  • m_thompson's Avatar
    July 7th, 2019, 05:31 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We tried to control the TU55s through the controller. If we command the drive to move, it moves about 1mm, stops, and shows an END error. It thinks...
    63 replies | 7942 view(s)
  • m_thompson's Avatar
    July 7th, 2019, 05:21 AM
    m_thompson replied to a thread New to me PDP-11/53 in DEC
    How do I tell which version I have? I have an Emulex UC07 Dual-SCSI that I could use. I should have more memory boards too. I need to...
    7 replies | 297 view(s)
  • m_thompson's Avatar
    July 6th, 2019, 07:20 AM
    m_thompson started a thread New to me PDP-11/53 in DEC
    I picked up a BA23 based PDP-11/53 yesterday that I removed from an Ultratech wafer stepper system. It lived all of its life in a clean room, so...
    7 replies | 297 view(s)
  • m_thompson's Avatar
    July 6th, 2019, 05:30 AM
    This will help: http://www.ultimate.com/phil/pdp10/dec.disks The manual for the RF09 for the PDP-9 was first printed in July of July of 1970, so...
    5 replies | 195 view(s)
  • MattisLind's Avatar
    July 5th, 2019, 12:27 AM
    Good work getting the 4907 working and a really nice 4054! I would like to somehow emulate the 4907. Did you do any work on this or is it me...
    14 replies | 336 view(s)
  • m_thompson's Avatar
    July 3rd, 2019, 09:17 AM
    You have an early 8/e. On the later ones the first switch position is at about 11:00 and the last at about 7:00.
    4 replies | 108 view(s)
  • m_thompson's Avatar
    July 3rd, 2019, 03:35 AM
    There have been several sold on eBay recently, but they were quite expensive.
    1 replies | 97 view(s)
  • m_thompson's Avatar
    July 2nd, 2019, 03:46 AM
    m_thompson replied to a thread what switch panel is this? in DEC
    It might be from a PDP-8a. The third LED is for Battery Charge.
    9 replies | 358 view(s)
  • m_thompson's Avatar
    July 1st, 2019, 12:41 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Several of the Margin Power switches were on, and we didn't have the Margin Power Supply cable installed, so there were unpowered sections of the...
    63 replies | 7942 view(s)
  • MattisLind's Avatar
    June 30th, 2019, 04:04 AM
    I have a PDP-8 Maindec. VT55 acceptance test. Both paper tape and listing. http://www.datormuseum.se/documentation-software/paper-tapes I can...
    13 replies | 722 view(s)
  • m_thompson's Avatar
    June 25th, 2019, 04:20 AM
    How about a quad board with a KT8A and 128kw of RAM, and other peripherals.
    22 replies | 1370 view(s)
  • m_thompson's Avatar
    June 24th, 2019, 04:01 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    Looks like the S107 module in the TC02 inverts two of the device address bits from the processor. One of the inverted bits is inactive, so the next...
    63 replies | 7942 view(s)
  • MattisLind's Avatar
    June 24th, 2019, 12:17 PM
    I have a bunch of Signetics N8X305 that I am unlikely to ever use. Pulls from circuit boards. Give me an offer to consider!
    7 replies | 345 view(s)
  • m_thompson's Avatar
    June 24th, 2019, 03:58 AM
    Roland, An combination I/O card that included RTC, two serial, Centronics printer port, memory, and bootloader would be really great. It would...
    22 replies | 1370 view(s)
  • m_thompson's Avatar
    June 23rd, 2019, 03:50 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    We connected up the I/O cables from the PDP-9 processor to the TC02 and borrowed the indicator display cables from the TC59 controller. When...
    63 replies | 7942 view(s)
  • m_thompson's Avatar
    June 23rd, 2019, 03:49 PM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    I could only find Dialight 507-397-1475-600 replacements. The originals are flush with the front panel. The replacements stick out about 1/8".
    63 replies | 7942 view(s)
  • m_thompson's Avatar
    June 23rd, 2019, 05:34 AM
    m_thompson replied to a thread PDP-9 at the RICM in DEC
    The original power supply in the I/O cabinet for the TC59 Magnetic Tape controller didn't have enough power to also feed the TC02 DECtape controller....
    63 replies | 7942 view(s)
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