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  • Mike_Z's Avatar
    Today, 08:14 AM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    Say.. thanks for the code. I'll have to study this a little. How did you use this to test the EAE actually? I'm getting the EXCEL to work, it's...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    Yesterday, 09:32 AM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    Yesterday I thought of an idea to simulate one of the D0MB divide problem in EXCEL. That way I could simulate problems with subtraction, shifting...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 19th, 2018, 10:38 AM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    CW, the problem is that memory data can not be complimented, so the accumulator is complimented instead. Then when MQ0 is to be shifted into AC, you...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 19th, 2018, 09:31 AM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    You maybe correct. This is all new to me and at my advance age, I still get things wrong. I'll look at this closer tonight. I think that ADLK L is...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 19th, 2018, 09:06 AM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    Other than the D0MB program I have not run anything else. Currently, I am studying the flow diagram on page 1-16 in the Vol 2 of the maintenance...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 18th, 2018, 12:59 PM
    Mike_Z replied to a thread Troubleshooting EAE on PDP8E in DEC
    This is what D0MB prints out when it detects the DVI error ___________L_____ AC________________ MQ_____________MB...
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 17th, 2018, 11:57 AM
    Last year I was attempting to re learn Fortran IV with my PDP8E. While testing my knowledge with some simple programs, I found some obvious errors....
    11 replies | 284 view(s)
  • Mike_Z's Avatar
    January 14th, 2018, 01:53 PM
    Ken had asked my to post a couple pictures of the ASR33 keyboard. Apparently he is interested in making an emulation of the ASR. So here are a few...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 14th, 2018, 01:37 PM
    Well..... in between going to church and watching football, I found my copy of ProComm, but it was for windows 3. The computer I'm using only has DOS...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 02:34 PM
    You'll have to forgive me, but on the way back to the computer, my wife said the checkbook would not balance, so I had to figure that out. Then while...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 12:05 PM
    Stops means that the IBM XT stops receiveing and creates and saves the file. I'll check the paper tape for a ctrl z, but shouldn't the /b, for binary...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 11:17 AM
    To be perfectly honest, I'm not sure. What seems to happen is that after a while the IBM XT stops to empty the com buffer to the file, and then...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 11:10 AM
    Looks like what I'd have to do to control the paper tape reader would be to control the Distributor Clutch Trip Coil. When this relay is picked up,...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 10:29 AM
    The ASR33 has a 20 ma loop. I built a RS232 to 20 ma converter. But for simplicity I use CTS/RTS and the ASR33 just shorts the two wires. I'll have...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 13th, 2018, 07:46 AM
    I have an ASR 33 teletype which I have connected to my IBM XT through the COM1 port. The reason being, I want to make files into paper tapes and...
    20 replies | 438 view(s)
  • Mike_Z's Avatar
    January 4th, 2018, 07:20 AM
    Mike_Z replied to a thread MAINDEC Diagonstic in DEC
    Yup! I'm using the 110 baud paper tape on the ASR 33. It is kind of traditional. I really don't mind it being slow. It gives me time to think and...
    8 replies | 313 view(s)
  • Mike_Z's Avatar
    January 3rd, 2018, 02:35 PM
    Mike_Z replied to a thread MAINDEC Diagonstic in DEC
    Well.... for one thing, it's easier and faster to load up program. Paper Tape at 110 baud is SSsssLllloooooowww. It takes about 7 minutes to load up...
    8 replies | 313 view(s)
  • Mike_Z's Avatar
    January 3rd, 2018, 09:53 AM
    Mike_Z started a thread MAINDEC Diagonstic in DEC
    Recently, I picked up a few spare cards for my PDP8E. Some seem to work and others not. I had a bad M8300 Major Register card that eventually I...
    8 replies | 313 view(s)
  • Mike_Z's Avatar
    January 1st, 2018, 02:57 PM
    OK, I see the numbers. Looks like all my cards have a number here. The M8340, which is dated AUG 13 1974 has a "CS" of 438 F. The M8341, which has a...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    January 1st, 2018, 08:00 AM
    OK, that brings up a question for me. How are the "old" and "new" boards marked, howe can they ID'ed? My boards have a date stamped on them. Most are...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 31st, 2017, 03:44 PM
    What???? I'm shocked! Isn't everyone entitled to my opinions and ideas? HHHaaaaa..... more reading on a cold evening. Thanks Mike. Holy Cow! this...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 31st, 2017, 07:56 AM
    That's an interesting view point and a doable method. What should a guy do with the cards that are in the machine? My hardware resides in my...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 30th, 2017, 04:21 PM
    No, I do not have any bags, yet. I'll pick up a 100. And I do not religiously ground myself, but have a grounding strip. Maybe I should use it more....
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 30th, 2017, 01:50 PM
    Quite and interesting booklet. I never worked for DEC or any other computer related company. My trade was Power Engineering. So, I worked in many old...
    7 replies | 364 view(s)
  • Mike_Z's Avatar
    December 30th, 2017, 01:31 PM
    Thanks, I have a general question. I have maybe a dozen or so spare PDP8E boards that I picked up a year or so ago. This M8300 was one of them. I am...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 30th, 2017, 12:13 PM
    Well, I'll be! The chip clips and mini grabbers showed up in the mail yesterday. I was a little disappointed in the grabbers in that they were...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 26th, 2017, 08:05 AM
    This car was a little different than most of the others we have ever looked at. The seller provided pictures and a video which looked OK. But when we...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 25th, 2017, 12:26 PM
    Well.... here in Wisconsin, Christmas is mostly Christmas eve. Church, presents, Santa, etc. So Christmas day is Big dinner, so that means, at least...
    79 replies | 2786 view(s)
  • Mike_Z's Avatar
    December 23rd, 2017, 11:09 AM
    Today, since I only have one good chip clip and my make shift device, I did some hay wiring and got a nice picture of the TS & TP timing pulses. It...
    79 replies | 2786 view(s)
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About Mike_Z

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About Mike_Z
Biography:
Retired Old Steam Power Plant Engineer
Location:
Near Milwaukee Wisconsin
Interests:
Old stuff, computers, cars, furniture, houses
Occupation:
Retired

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