• Please review our updated Terms and Rules here

Search results

  1. F

    In search of RK05 rack caddy

    Now that my 11/45 is up and running, I could really make good use of an RK05 rack storage caddy, as seen in the attached pic on a PDP-8. Does anybody have one of these they'd be willing to sell, or at least know the DEC part number so I could look for drawings? There seem to have been two...
  2. F

    PDP-11/34 or /04 front panel knob?

    Hi, I'm working on a PDP-11/34 right now, with the KY11-LB programmer's interface, and it is missing its front panel power control knob. It looks to me like the same one is used on the 11/04? Anybody happen to have a spare, or a 3d model, or willing to take some measurements? Does the stock...
  3. F

    11/45 RSTS boot problem

    Hi all, Some here may know I’ve been working on an 11/45 restoration off and on for some time now. My ’45 currently has floating point, KT11-C mem mgmt, 124 kword MS11-L, and an RK11-C with one restored RK05 drive. Last week I decided to see if I could bring up RSTS on the machine. I...
  4. F

    Wanted: DEC VT05 Font Pictures or ROM Dump

    Double checked the reference on the schematic -- it is MM5240AM (the "AA0" mentioned earlier was a mistake). It seems National had a series of pre-fab parts with different fonts/encodings available, but the individual data sheets are hard to find... The one other datasheet I could find had the...
  5. F

    Wanted: DEC VT05 Font Pictures or ROM Dump

    Hi Ken, Schematics on Bitsavers indicate an off-the-shelf National MM5240AA character ROM. You can find the part described starting on page 99 of the databook at: http://bitsavers.trailing-edge.com/components/national/_dataBooks/1972_National_MOS_Integrated_Circuits.pdf Here's the character...
  6. F

    In search of DZ11 cabling / panel

    Hi all: I'm in need of cabling and a distribution panel for a DZ11 I'd like to put in my PDP-11/45. Before I embark on building something up from scratch, I thought I'd ping here and on cctalk to see if anybody has all or part of this on hand and would be willing to work out a deal. PM me if...
  7. F

    RK11-C / RK05 restore

    Rejumpered the G740 on my RK11 for a single drive, but MAINDEC ZRKK still hangs up in hardware pole test (octal 57). It could just be that this test doesn't work correctly with less than two drives? After this had a brief detour because the machine stopped booting off the M9301 bootstrap card...
  8. F

    PDP 11/45, Part 5

    Hey folks, just a note friends here working on 11/45 restores -- I just got my first boot off an RK05 XXDP pack with my project a few minutes ago :-) It's been about two years of working on my restore off and on on weekends and vacations. I've still got a ways to go on this project, but seeing...
  9. F

    RK11-C / RK05 restore

    Success!! (Well, at least reads) Replaced the failed bus driver on my 11/45 UBC. NPG signaling was better, but still a little squirrelly... Turns out I also needed to install some jumpers on my M9301 bootstrap terminator to enable grant pull-ups, which are not provided internally on the 11/45...
  10. F

    RK11-C / RK05 restore

    Taking apart my first RK05 pack for cleaning, I was depressed to see some evil foam inside the back, around the hub (see picture below). If this is decaying like the rest of the foams DEC used, this seems like a disaster brewing. I hadn't read about foam removal inside packs before. A known...
  11. F

    RK11-C / RK05 restore

    An update on the RKCS bus timeout issue: I received my digital scope in the mails, so have been able to take a good look at the SSYN signaling. The short of it: Using the M9202 bus jumper reduced the amplitude of the timeout glitch to where timeouts were not tripped, but did not eliminate...
  12. F

    RK11-C / RK05 restore

    Attached logic analyzer probes to BUS A MSYN L, BUSA SSYN L, and UBCB TIMEOUT (1) H at the rear of the UBC board on the 11/45 backplane, with the UBC board fully seated. Set the trigger on the timeout line, and running my test program I can see that timeout glitches for about 12ns right before...
  13. F

    RK11-C / RK05 restore

    Yup, it's a beast (see pic below). I'd been carrying it around in pieces, collecting parts and spares, etc. for years -- finally got to working on the assembly and restoration over the last couple years since my kid is up and out. The whole project is blogged, with many more photos, over at...
  14. F

    RK11-C / RK05 restore

    Update after the weekend: racked, cabled, and powered up the RK11-C. Tracked down and repaired a failed gate in the RKDB register. Now getting a bus timeout in test 21 (controller reset) of the ZRKJE0.BIC diagnostic, which will be the next thing to investigate. More detailed writeup on my...
  15. F

    RK11-C / RK05 restore

    Hi folks! Kicking off a thread here because I'm just starting to dive in on the storage subsystem of my PDP-11/45: and RK11-C + 2x RK05, and I'll be wanting to take advantage of the collected wisdom and good advice here. There's been a fair amount of talk on RK05s here and on the cctalk, and...
  16. F

    PDP-11: BC11-A cable dress between cabinets

    Hey folks, I've gotten to the part of a PDP-11/45 restore I’ve been working on where I need to run a Unibus cable between the CPU box in one rack and an RK11-C controller at the top of the next rack over. I'm a bit puzzled about how best to run the bus cable to keep it out of harm's way, e.g...
  17. F

    Wtb: M105 + m7821

    Hi folks: I've been thinking about trying some interfacing/emulation projects in the new year. I'd like to track down an M105 address selector and an M7821 (or M7820) interrupt control to keep things simple to start with. Anybody have surplus of these they'd be willing to sell/trade? Thanks...
  18. F

    Looking for engineering drawings for 860 power controller?

    Hi folks, I'm looking for engineering drawings for the 860 series power controllers, the ones that were found in the tops of H960 racks. I'm coming up empty over at bitsavers. Anybody know if these are tucked in with some other engineering drawing set? There are partial schematics to be...
  19. F

    FTGH: M7237 11/40 stack limit register

    Hey folks, Going through one of my boxes today, I found a spare M7237. Since I have only an 11/45, this is of no use to me, though somebody with an 11/40 who is missing one would probably appreciate it. I'm happy to to pop this in the mails to anybody who needs one. cheers, --FritzM.
  20. F

    FP11-B: what is signal FICC EXT ADD L?

    Hi folks, I've been working through an FP11-B debug for my 11/45. I've got it narrowed down now to an issue with the low-bit carry logic during the subtraction phases of multiplication. This logic is documented on sheet FRMH of the FP11-B engineering drawings as seen here: I'm curious as...
Back
Top