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    At home now :-)! COVID-19: Work = spare...

    At home now :-)!

    COVID-19: Work = spare bedroom (work IT - personal emails and file sharing sites forbidden). Home = downstairs on my Mac...

    That picture is no good if you want to run BASIC......
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    Ah ha... SW200 / SW201 being all off is no...

    Ah ha...

    SW200 / SW201 being all off is no good...

    I can't see a combination of SW200 (ROM base address) and/or SW201 (RAM base address) where all links being out (switches OFF) are a valid...
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    I have found a picture at...

    I have found a picture at https://github.com/TomNisbet/Simple8085/blob/master/docs/explorer85.jpg.

    This has SW200 as 1/4/5 IN/ON (ROM at $C000 as expected).

    But has SW201 as 1/4/6/8 IN/ON for...
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    The default 256 bytes of RAM is at $F800 to...

    The default 256 bytes of RAM is at $F800 to $F8FF.

    The monitor uses from $F8DC upwards, meaning that $F800 to $F8DB is available for you to use.

    To modify some user memory:

    .IF800
    01
    02
    04
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    How are you keeping. I still owe you an email...

    How are you keeping. I still owe you an email don't I!

    The information I have found at...
  6. If you canít get a good clip connection, solder a...

    If you canít get a good clip connection, solder a small length of solid wire onto the point(s) you wish to measure. I slip a small piece of insulation onto the wire and bend the bare end up a bit to...
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    After some thought (and lunch)... my advice would...

    After some thought (and lunch)... my advice would be to use your logic analyser to monitor the control signals around the 6520 PIA UB12 and see what values are being sent to the device to initialise...
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    I was reviewing all of the posts just now: 1....

    I was reviewing all of the posts just now:

    1. There is a history of ‘eaten pins’.
    2. There is a history of problems with /IRQ.
    3. At one point you suspected a problem with data line D7. I don’t...
  9. Nicely done! What a swine of a problem to cut...

    Nicely done!

    What a swine of a problem to cut your teeth on! But you (hopefully) succeeded...

    It sounds like a very long session of space invaders is called for now - all in the interest of...
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    Yep, everything looks OK there. The UD7 /CSI...

    Yep, everything looks OK there.

    The UD7 /CSI is OK. The ROM at Exxx is disabled (signal high) when E8xx is selected (the I/O area).

    Yep, NOP generators - as simple as they are - are a very...
  11. Thread: VAX Haul...

    by daver2
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    3,163

    I remember at some point in the dim and distant...

    I remember at some point in the dim and distant past I had to increase the number of global pages to run a bespoke application I was trying to compile for a company.

    It didn't seem that difficult...
  12. Thread: VAX Haul...

    by daver2
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    Excellent advice, works exactly as described. ...

    Excellent advice, works exactly as described.

    Thanks very much.

    Next thing, install various languages...

    Dave
  13. Thread: VAX Haul...

    by daver2
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    3,163

    Thank you everyone for your extremely helpful...

    Thank you everyone for your extremely helpful (and very detailed) assistance.

    I will give my newly-gained knowledge a test this week!

    I do remember reading somewhere that the DEC ISO images...
  14. Thread: VAX Haul...

    by daver2
    Replies
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    Perhaps it is an 'age' thing... Perhaps it was...

    Perhaps it is an 'age' thing...

    Perhaps it was 11M at the time? That brain cell has died now!

    I am having a night off for a change, so - before I do the next thing with my OpenVMS 6.1 install -...
  15. Thread: VAX Haul...

    by daver2
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    Getting further. Got the base OpenVMS 6.1...

    Getting further. Got the base OpenVMS 6.1 Operating System installed at the second attempt. I misread one of the questions on the first attempt...

    Much easier than a RSX11M+ SYSGEN...

    One step...
  16. Thread: VAX Haul...

    by daver2
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    Just looked up the protocol specification for the...

    Just looked up the protocol specification for the Logitech Logimouse C7 - and that (at first check) seems to support the same protocol as the DEC equivalent.
    ...
  17. Thread: VAX Haul...

    by daver2
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    There is a long story about the internet access...

    There is a long story about the internet access (or rather lack of)...

    The bizarre thing is that my install manual is only 3m away from the machine in a plastic container. Dooooo!

    Never mind,...
  18. Thread: VAX Haul...

    by daver2
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    Thanks for the links. Another chance...

    Thanks for the links.

    Another chance conversation the other day with a remote work colleague *** may *** have located another stash of decommissioned VAX machines...

    These things are like...
  19. Thread: VAX Haul...

    by daver2
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    I smoke tested the terminals I had acquired - a...

    I smoke tested the terminals I had acquired - a bit disappointing :-(...

    I have one VT220 (white) and one VT420 (green) that are OK.

    The other VT220 appears to have a power-supply related issue...
  20. My guess would be a German company (with the...

    My guess would be a German company (with the umlauts).

    I searched for "Loetseite" (replace the umlauted "o" with "oe") and the most hits that came up appeared to be a PLC manufacturer.

    However,...
  21. Thread: VAX Haul...

    by daver2
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    >>> but I'd like a DEC one. Same here (or the...

    >>> but I'd like a DEC one.

    Same here (or the digitising tablet - probably even rarer)...

    I'll keep an eye out. Whilst chatting to another colleague about something totally unrelated yesterday...
  22. Thread: VAX Haul...

    by daver2
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    If I am reading/understanding the error section...

    If I am reading/understanding the error section of the manual correctly, your DZ 003 error is a missing mouse. DZ 002 is a missing keyboard.

    Yes, HEX code 0070 (hex) is a mouse error.

    Dave
  23. Thread: VAX Haul...

    by daver2
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    >>> Next task will be to get DECwindows Motif...

    >>> Next task will be to get DECwindows Motif running

    That's my next job...

    Dave
  24. Thread: VAX Haul...

    by daver2
    Replies
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    So, it is smart enough to spot that there is no...

    So, it is smart enough to spot that there is no monitor connected. That is the first time I have come across that in a machine!

    I managed to erase the last two SCSI disks tonight (both 0.5 GB -...
  25. Thread: VAX Haul...

    by daver2
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    When I get my cable and smoke test the monitor...

    When I get my cable and smoke test the monitor (:-)) I will check.

    Thanks.

    I will look in the manual and see if I can decode how you got that. I may need a bit of help if I can't...

    Dave
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