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  • daver2's Avatar
    Today, 03:26 AM
    daver2 replied to a thread I got my PiDP-11 kit in in DEC
    Fundamentally, yes. PDP-8's were originally sold as hardware + computer languages (e.g. PAL8/FORTRAN) and then they extended to an operating...
    18 replies | 784 view(s)
  • daver2's Avatar
    Today, 03:10 AM
    >>> PS, do I understand correctly that the original chiclet keycaps won't work with the replacement keyboard? I am not sure I understand what you...
    3 replies | 100 view(s)
  • daver2's Avatar
    Yesterday, 12:50 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Mike, Sorry, I didn't read your post properly last night! I had to rush out to our Church house group. I didn't read that we had actually fixed...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 13th, 2018, 11:30 PM
    You can test if the PET itself is OK by removing the physical keyboard connector and jumpering out the row and column pins for each key and see if...
    3 replies | 100 view(s)
  • daver2's Avatar
    November 12th, 2018, 11:13 PM
    daver2 replied to a thread I got my PiDP-11 kit in in DEC
    If you look at the OS/8 language reference manual you will find that you can program the beast in BASIC, Assembler (PAL-8, SABR etc.), FORTRAN, and...
    18 replies | 784 view(s)
  • daver2's Avatar
    November 12th, 2018, 01:15 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Sounds like a plan. Just come back from my evening walk and was thinking about why the line of A's etc. worked? That is what makes bug hunting...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 12th, 2018, 11:57 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    I have spent half an hour or so looking at the listing. I fundamentally agree with your assessment (at a high level). One thing that struck me...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 12th, 2018, 10:38 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    That sounds like a sensible idea. Dave
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 12th, 2018, 08:58 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Yep, come to the same conclusion myself today! What I didn't realise is the the characters that are printed out are 'one less' than they should be...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 12th, 2018, 08:48 AM
    daver2 replied to a thread I got my PiDP-11 kit in in DEC
    All the manuals for OS/8 are on Al's excellent bitsavers website under dec/PDP-8/os8 (or some closely related path). Just checked, look in...
    18 replies | 784 view(s)
  • daver2's Avatar
    November 11th, 2018, 03:49 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    No problems... Getting a bit late in the UK so I will have a look tomorrow - if you don't find it in the meantime! One thing I just thought of...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 11th, 2018, 01:26 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Did you post the correct listing file? I see SSBIT, CNT and CNT1 are still there - but you say you have removed them? I also see the other...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 11th, 2018, 11:29 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Ignore the above issue I have described at address 00371 with the DBRI instruction. The DBRI instruction forces control lines C0 and C1 to 0 which...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 11th, 2018, 10:59 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    I think there are a few errors to correct... At address 00363 you have: PTRRB, 0 TAD SSBIT I think this should be: PTRRB, 0
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 11th, 2018, 09:47 AM
    I keep meaning to get mine working again as well. I bought some replacement batteries a while ago so will need to perform "open battery pack"...
    7 replies | 620 view(s)
  • daver2's Avatar
    November 11th, 2018, 09:40 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    >>> Today is Armistice Day, I hope everyone toke a moment to remember. Sure did. Good news for the integration of the updated code. Just...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 11th, 2018, 12:07 AM
    Welcome to VCFED - as this is your first post. Unfortunately, there is no clear cut answer to this question! Some people sell stuff as a...
    12 replies | 289 view(s)
  • daver2's Avatar
    November 10th, 2018, 01:01 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Well done that man :-)! Yes, too long a delay and you will miss characters. No delay, and shorter code, is good. I am just wondering if we can...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 10th, 2018, 12:32 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    I agree, let's be sure we are 100% confident that your test program works as it should before integrating the logic into the OS/8 driver. As a...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 10th, 2018, 11:56 AM
    +1 for an address line logic fault to the video RAM somewhere. It could be a faulty RAM - but (as stated) you would have to have two faults -...
    12 replies | 226 view(s)
  • daver2's Avatar
    November 10th, 2018, 11:52 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    The fog's clearing again :-)... Section 3.3.2 part d in the manual I am reading quotes 0.75 milliseconds - hence why I can't see the value you are...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 10th, 2018, 11:11 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    The MODE SELECT input just appears to invert the data and DATA READY output signals - so can safely be ignored. You just need to make sure the signal...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 10th, 2018, 10:08 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Upon another read of the REMEX manual I did see reference to ensuring that the DATA READY signal was 'true' before applying the HIGH SPEED signal and...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 10th, 2018, 09:47 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    Some 'bright sparks' did come up with decimal time at various points in history (see https://en.wikipedia.org/wiki/Decimal_time)... Good news...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 9th, 2018, 12:56 PM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    I am afraid we left "English" units behind many years ago! It turns out it is much easier counting in decimal :-)... If it doesn't drive in manual...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 9th, 2018, 09:06 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    The 20's - that's warm! Oh, you mean F not C... Why are you assuming that it is the REMEX that is at fault when the last thing you did was some...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 7th, 2018, 08:31 AM
    If you didn't want to go to the trouble of a complete kit of parts - perhaps you could consider the PCB and a set of pre-programmed parts possibly? ...
    31 replies | 1744 view(s)
  • daver2's Avatar
    November 7th, 2018, 08:18 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    I don't think there is much rewiring required - I think a few additional wires at the most. From what I can see you would have to wire up: /SYSRDY...
    108 replies | 4841 view(s)
  • daver2's Avatar
    November 7th, 2018, 08:05 AM
    +1 Dave
    31 replies | 1744 view(s)
  • daver2's Avatar
    November 6th, 2018, 11:42 AM
    daver2 replied to a thread REMEX Paper Tape reader in DEC
    >>> Now, if you ever need to discuss milling coal or protection systems for equipment and/or transmission lines I still work in the electricity...
    108 replies | 4841 view(s)
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    http://www.vintage-computer.com/vcfo...ad.php?t=12058

    EPROM's don't last forever, and eventially you have to reburn them which I think is why your Tektronix isn't working. Have you tried contacting the guy to that website to see if he can reburn your EPROM's for you? Or if you have a EPROM burner, have you asked him to email you an image copy?
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