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  • saipan59's Avatar
    Yesterday, 05:40 AM
    saipan59 replied to a thread DLV11J et.al. replacement in DEC
    Just wondering why multiple USB connectors? Since you can have multiple virtual COM ports on a single USB. Do you imagine needing multiple PC's...
    8 replies | 243 view(s)
  • saipan59's Avatar
    April 2nd, 2020, 12:41 PM
    FWIW, here is the code found in a pair of 2716 EPROMs in my MXV11 board. I think this is for a TU58 boot. Everything in the chip not shown here is...
    4 replies | 174 view(s)
  • saipan59's Avatar
    April 1st, 2020, 02:33 PM
    Got me too, even after someone posted a 1-Apr warning... I think you guys that have this HW should get busy and implement it, using the various...
    13 replies | 349 view(s)
  • saipan59's Avatar
    April 1st, 2020, 10:43 AM
    You mentioned a couple of extra chips vs the older version. What are those chip types? A real EEPROM seems unlikely. If it truly is showing a...
    13 replies | 349 view(s)
  • saipan59's Avatar
    April 1st, 2020, 06:11 AM
    saipan59 replied to a thread PDP-11/23+ Restoration Blog in DEC
    Whoops, my bad. You're correct of course. A PTC is not really helpful in this case. A simple resistor that removes itself from the circuit after a...
    24 replies | 1141 view(s)
  • saipan59's Avatar
    March 31st, 2020, 06:38 PM
    saipan59 replied to a thread PDP-11/23+ Restoration Blog in DEC
    A suggestion for a simple way to mellow-out the inrush current: In the AC line, put a large-wattage incandescent light bulb in series. Then add a...
    24 replies | 1141 view(s)
  • saipan59's Avatar
    March 31st, 2020, 12:01 PM
    saipan59 replied to a thread DLV11J et.al. replacement in DEC
    It's hard to imagine how a programmable baud rate is useful for a one-of-a-kind interface. You're not going to be changing your baud rate on the fly....
    8 replies | 243 view(s)
  • saipan59's Avatar
    March 30th, 2020, 03:55 PM
    saipan59 replied to a thread PDP-11/23+ Restoration Blog in DEC
    Also, I would think that fire hazard is not a significant issue, because this gear is built to "industrial" standards (what we would call...
    24 replies | 1141 view(s)
  • saipan59's Avatar
    March 30th, 2020, 03:54 PM
    saipan59 replied to a thread PDP-11/23+ Restoration Blog in DEC
    A couple of ideas: - I would imagine that cold power-on is the riskiest thing. Arrange to leave things running, rather than power-cycling. But maybe...
    24 replies | 1141 view(s)
  • saipan59's Avatar
    March 29th, 2020, 05:40 PM
    Yes, the MXV should support either 2K or 4K chips. As it happens, I'm getting ready to do a similar thing with my little LSI-11 system. My new EPROM...
    4 replies | 174 view(s)
  • saipan59's Avatar
    March 27th, 2020, 03:56 PM
    saipan59 replied to a thread Terminals and consoles in DEC
    Yes, they have value ("whatever someone is willing to pay for them", eh?). Researching on eBay will be a start. Be aware that shipping cost is a...
    8 replies | 376 view(s)
  • saipan59's Avatar
    March 25th, 2020, 05:38 PM
    saipan59 replied to a thread T-11 experimenting in DEC
    Project Update: Everything works!! The AY3-1015D is now the console UART, and it's up and running Forth. The EEPROM burner side-project was...
    7 replies | 469 view(s)
  • saipan59's Avatar
    March 24th, 2020, 06:10 AM
    saipan59 replied to a thread PDP-11/23+ Restoration Blog in DEC
    FWIW, I don't recall ever seeing an 11/23 system that mixed RL02 and floppies. Perhaps because of the size mismatch (can't easily back up your RL02...
    24 replies | 1141 view(s)
  • saipan59's Avatar
    March 21st, 2020, 07:21 AM
    saipan59 replied to a thread T-11 experimenting in DEC
    The EEPROM burner is working. The HW is mostly just wires. I added a circuit to allow controlling the 5V power via FW, and an LED to show when the...
    7 replies | 469 view(s)
  • saipan59's Avatar
    March 19th, 2020, 04:10 PM
    saipan59 replied to a thread T-11 experimenting in DEC
    A setback: Adding the extra wires to support the new (old) UART has made the MC6850 more flakey, which makes it real hard to patch the code image to...
    7 replies | 469 view(s)
  • saipan59's Avatar
    March 18th, 2020, 01:45 PM
    saipan59 replied to a thread T-11 experimenting in DEC
    Thanks Chuck! Yes, I did consider it, and I have a couple of them. They are in a 24-pin package, which is nice, but require more glue logic to...
    7 replies | 469 view(s)
  • saipan59's Avatar
    March 18th, 2020, 10:57 AM
    saipan59 started a thread T-11 experimenting in DEC
    Some of you may recall that 5 years ago I made a PCB for a minimal T-11 system in "8-bit static" mode. This thread discussed it:...
    7 replies | 469 view(s)
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About saipan59

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About saipan59
Biography:
Worked for DEC since 1981.
Location:
Colorado Springs
Interests:
DEC, PET, vintage radios and test equipment
Occupation:
FW Engineer

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