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  • daver2's Avatar
    Today, 12:49 AM
    daver2 replied to a thread Newbie moderation in How To
    Stick at it. The spam on the board is kept to a minimum as a result and the mods are volunteers and (supposedly) have a life outside of VCFED as...
    4 replies | 48 view(s)
  • daver2's Avatar
    Today, 12:46 AM
    I would check the inputs and outputs from UE12 (4 to 16 decoder). It will be easier to use a NOP generator for this test. It is also possible...
    7 replies | 95 view(s)
  • daver2's Avatar
    Today, 12:31 AM
    I see a whole load of approved posts now :-)! Keep posting, you’ll hit the ‘magic’ level before too long... Your video circuitry is now working...
    7 replies | 95 view(s)
  • daver2's Avatar
    September 23rd, 2020, 08:05 AM
    >>> It is a little confusing at first but one gets used to it. Mode FORTH Engage. Your partial disassembly would help to kick-start me off. ...
    13 replies | 686 view(s)
  • daver2's Avatar
    September 22nd, 2020, 11:04 PM
    Sorry Dwight, I wasn’t clear enough. I am not interested in the data as stored within the 1702 EPROM but as the 4004 CPU will process the data. ...
    13 replies | 686 view(s)
  • daver2's Avatar
    September 22nd, 2020, 10:14 AM
    I think that is a good idea also. +1 to the count - although the post is a bit late to the party :-)... Dave
    14 replies | 2381 view(s)
  • daver2's Avatar
    September 22nd, 2020, 08:29 AM
    There doesn't look to be anything wrong with the "SCREEN 1,0" statement - it should select a medium resolution graphics screen with the colour burst...
    8 replies | 189 view(s)
  • daver2's Avatar
    September 22nd, 2020, 08:13 AM
    Four (4) separate binary files (labelled something obvious like A0740, A0741, A0742 and A0743) in a single ZIP would be my choice. Something that...
    13 replies | 686 view(s)
  • daver2's Avatar
    September 22nd, 2020, 03:34 AM
    And please provide the SCREEN statement as it is specified within the BASIC source code that is creating the error. There should be some...
    8 replies | 189 view(s)
  • daver2's Avatar
    September 22nd, 2020, 01:50 AM
    Did you ever send me the images? I don't recollect seeing them anywhere. Dave
    13 replies | 686 view(s)
  • daver2's Avatar
    September 22nd, 2020, 01:46 AM
    Only use a PET with the safety earth connected. You get to live then if a live to case short circuit occurs within the PET! Can you check the...
    127 replies | 8074 view(s)
  • daver2's Avatar
    September 22nd, 2020, 01:41 AM
    The (other) Dave here... Good detective work so far. Yes, a socketed UC2 probably indicates that someone has been working on it as you have...
    7 replies | 95 view(s)
  • daver2's Avatar
    September 20th, 2020, 03:53 AM
    C715 becomes C28 then... Note that this is a non polarised (NP) capacitor. Also, your video board doesn't appear to have a LIN inductor in the...
    13 replies | 246 view(s)
  • daver2's Avatar
    September 20th, 2020, 01:20 AM
    Assuming dave_m has identified the correct monitor schematic back in post #2, checkout the following components: C716 - power supply. I would also...
    13 replies | 246 view(s)
  • daver2's Avatar
    September 19th, 2020, 10:03 AM
    Andy, It should do. I designed it to run on all PETs with all versions of BASIC. It replaces the EDIT ROM (which would normally be in an IC...
    5 replies | 89 view(s)
  • daver2's Avatar
    September 19th, 2020, 08:12 AM
    My PETTESTER code uses the MARCH-C memory test for that very reason. The only problem I ran into (and plan to fix sometime) is that to access...
    5 replies | 89 view(s)
  • daver2's Avatar
    September 17th, 2020, 09:55 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    All the storage boxes had tape drives in them. But, I suspect, I will have a few SCSI disks spare when I have finished I dare say. Dave
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 17th, 2020, 09:30 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    The pile of VAX bits seem to diminish to zero this afternoon! Thank you to everyone who has played their part in saving equipment from the...
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 17th, 2020, 01:25 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    A bit of a delay getting equipment offsite today. Enjoy the sights of Morecambe and pop back after 12:30. Hopefully the equipment should be there...
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 16th, 2020, 04:36 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    I have removed the hard disks from the equipment and labelled everything up ready for the 'shifters' tomorrow. I will take them back with me and...
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 15th, 2020, 06:07 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    I can't take photographs (there is a reason) - but I am sure that some will appear from the recipients in due course :-). Incidentally, the road...
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 14th, 2020, 01:06 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    Just a "heads up". The approach road to the power stations is closed and a diversion is in place. The diversion still takes you past goods...
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 13th, 2020, 06:43 AM
    My post #46 probably holds the secret? MCTERM ROM and disk plus an interface cable between the USER port ‘bit banging’ the serial lines to the...
    58 replies | 5710 view(s)
  • daver2's Avatar
    September 12th, 2020, 12:10 PM
    But is that schematic valid for your machine though? OK, the schematics look similar, but... So, what you are proposing to do is to parallel up...
    18 replies | 237 view(s)
  • daver2's Avatar
    September 12th, 2020, 11:32 AM
    UE2? Have I got the right schematics and board layout I wonder? Dave
    18 replies | 237 view(s)
  • daver2's Avatar
    September 12th, 2020, 09:37 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    Gary, Sorry about the confusion. I sent one to your private email account. dave
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 12th, 2020, 08:00 AM
    Here is mine https://drive.google.com/drive/folders/1fyLbr1kcG98a2FDOMo1H5pj9lIdJpHcx?usp=sharing This fits in the EDIT ROM socket (not in place...
    18 replies | 237 view(s)
  • daver2's Avatar
    September 12th, 2020, 06:00 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    PMs sent to everyone who requested equipment. Dave, I will put yours in the post - once I find out what it is... Dave
    27 replies | 1115 view(s)
  • daver2's Avatar
    September 11th, 2020, 11:18 PM
    How are you testing your PET? Are you using a PETTESTER ROM of some description or what? the /CAS line going low ‘once a blue moon’ is not...
    18 replies | 237 view(s)
  • daver2's Avatar
    September 11th, 2020, 04:15 AM
    daver2 replied to a thread DEC equipment - UK only. in DEC
    Gary, I thought you would... The equipment is being moved to offsite deliveries first thing Thursday morning. Equipment can be picked up from...
    27 replies | 1115 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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