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  • DougIngraham's Avatar
    Today, 07:42 AM
    It doesn't look like timing violations. What we are seeing is power supply noise. I saw the 5V dip to as low as 4.06 and then spring up to 5.6...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    Yesterday, 09:37 PM
    We spent several more hours working on the 32k CMOS memory issue and I am more confused than ever. What I thought was happening was the outputs of...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    Yesterday, 08:04 AM
    I am hanging out with Vince in his shrine to the PDP-8. Every time I visit I see something I have never seen before. We scanned in some of my...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 26th, 2021, 07:17 AM
    I have 2 RX01's and an RX02. I am on a road trip right now so I can't get any photos until I get home. The first of the RX01's I got was in the...
    40 replies | 2038 view(s)
  • DougIngraham's Avatar
    February 24th, 2021, 09:06 PM
    I spent the last couple of days working on my OS/8 handler book. I expanded the section on the OS/8 boot process adding the RK05 boot loader, the...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 23rd, 2021, 06:59 AM
    Going back to post #11, the rack mount cover was attached to the rack and not the drive. 15 minutes after the drive was pulled from the rack the...
    40 replies | 2038 view(s)
  • DougIngraham's Avatar
    February 21st, 2021, 01:03 PM
    I said that. I did imply that I was a little bit nuts to even bother writing this didn't I? A PDP-8 at around 500 watts is not a very efficient...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 21st, 2021, 09:21 AM
    That is what I was referring to. I committed a crime when I didn't take it. My punishment is that now when I want one I don't have one. I am...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 20th, 2021, 07:50 PM
    From what I can see in the photos, those are nice looking Teletypes. I should probably get a teletype of some kind. I used one in high school...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 15th, 2021, 09:12 AM
    Very noisy! I have been considering leaving the heads loaded all the time. Would it cause extra head wear? Would it cause the media to wear...
    40 replies | 2038 view(s)
  • DougIngraham's Avatar
    February 9th, 2021, 09:14 PM
    Vince found a couple of bugs in my help loader inspired serial disk boot loader so I corrected those. This is very close. Vince is working on...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 6th, 2021, 06:27 AM
    I didn't invent this. It is the way the old help loader works (DEC-08-LHAA-D). There is a PDF of the writeup on Vince's site. dec-08-lhaa-d.pdf...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 5th, 2021, 01:24 PM
    Hopefully I will beat the avid reader of my boot code when they want to point out how I messed up. I have found two issues. First one is that the...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 5th, 2021, 07:05 AM
    This is my whole reason for doing it. I have a Straight 8 and an 8/i neither of which have boot boards. Toggling in the RIM loader used to be fun. ...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 4th, 2021, 11:08 PM
    The intention is that this will be a shorter boot sequence for those who do not have a boot board with the serial disk boot in it. I am thinking of...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 4th, 2021, 08:25 PM
    While Vince and Kyle are consolidating Serial Disk for an update to Github I decided to work on a shorter boot for the older machines that do not...
    229 replies | 15900 view(s)
  • DougIngraham's Avatar
    February 3rd, 2021, 08:35 AM
    Before he passed my friend Warren had on his list to make a replica Straight 8. A little one. It would have all the R, S, W and G cards in the same...
    25 replies | 1205 view(s)
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About DougIngraham

Basic Information

About DougIngraham
Biography:
Retired now. Worked with computers since 1973.
Location:
Rapid City, SD USA
Interests:
PDP-8's, SOL-20. Photography, Electronics, 3D modeling and printing, Space stuff, EV conversions.
Occupation:
Retired, Network Analyst, Consultant, Programmer, Mainframe maintainer, TV Broadcast Engineer

Signature


Doug Ingraham
2nd owner of Straight 8 SN1173
5 other PDP-8's including an 8/i and a DECSet 8000
SOL-20

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Today 06:04 PM
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October 2nd, 2019
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