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  1. I'll have a poke around tomorrow. Certainly could...

    I'll have a poke around tomorrow. Certainly could be a timing issue - I have noticed that amongst other things the cursor now seems to be blinking twice as fast as it should (it was ok in the earlier...
  2. Commodore PET 3016 screen glitch & double image

    Folks,

    any idea what might be causing this please ?
    After power on 10-15 seconds on the screen glitches or wobbles into a double image. I'm not sure if its the mainboard or the CRT driver - I...
  3. Seems to work although the Model 1 seems to have...

    Seems to work although the Model 1 seems to have some issues.....

    57116

    57117
  4. Well, here is my answer - what a mess. The...

    Well, here is my answer - what a mess.

    The incoming power cable goes to a junction board/fuse holder that subsequently feed the rear three power sockets on the monitor (none of which go through...
  5. Thanks. I have downloaded that set from HP and...

    Thanks.

    I have downloaded that set from HP and they work fine.
    I'm actually after the two 5.25 Compaq MSDOS installation disks that would have come with the machine - version 3.1 as I recall.
  6. Compaq Portable II English DOS setup disks 1 & 2 ?

    Folks,

    My old Portable II has sprung into life. I have found a copy of the diagnostics disk but am only able to find German setup disk 1 and 2 images (DOS install disks) online.

    Does anyone...
  7. Yikes - forgot it from previous post. Now...

    Yikes - forgot it from previous post. Now corrected.
  8. Hi Larry - this is the monitor in question....

    Hi Larry - this is the monitor in question.
    Both cables emerge from the bottom rear of the unit. Cable in question is on the right - thick three core flex with red, black and white cores.

    Thin...
  9. Ah, so does the power for the monitor come from...

    Ah, so does the power for the monitor come from the DIN connector attached to the TRS base unit then ?
    It looked like a power cable as its rather thick flex and I can understand someone cutting that...
  10. Model 1 monitor power cable colour code

    Folks,

    I acquired a Model 1 with monitor (European 240V model) and the plug has been cut off the monitor power cable.

    Cable colours are red, black and grey - anyone know how this maps to modern...
  11. Let me know what you want to sell please. ...

    Let me know what you want to sell please.

    Thanks.
  12. Well the power supply is fixed - a mixture of...

    Well the power supply is fixed - a mixture of short circuit tantalum capacitors and open circuit large smoothing capacitors.

    56492

    It appears to have an almost identical firmware setup to a...
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    It's been a while. Replaced all the filter...

    It's been a while.

    Replaced all the filter capacitors and several tantalum capacitors in the power supply and this terminal is now working.

    It's really rather nice.


    56474
  14. Replies
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    176

    Thanks - replied via PM.

    Thanks - replied via PM.
  15. Replies
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    176

    WTB: Data I/O 29B device programmer

    Looking for one of these - preferably in Europe to save shipping costs but will consider rest of the world.

    Thanks
  16. Replies
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    Yes - I need to get hold of the graphics demo...

    Yes - I need to get hold of the graphics demo floppy - still trying to work out the best way to get the hard sector floppy images to disk.
    Right now all I have is a bootable Wordstar disk with...
  17. Replies
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    2,880

    Quick update. 50Hz PROM has arrived - after a...

    Quick update.

    50Hz PROM has arrived - after a quick lunch time test it seems to work perfectly. Thanks Larry for correcting the code for me, we should probably dump the file on bitsavers.
  18. Replies
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    Some success with the Advantage. Have now...

    Some success with the Advantage.

    Have now tried running the machine from a 110V 60Hz pure sine wave inverter and the picture is now stable.

    56411

    I have a replacement 50Hz PROM on order that...
  19. Replies
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    2,880

    Ok sorry - then I misunderstood the device specs...

    Ok sorry - then I misunderstood the device specs - I though it was to be programmed with the 256 nibbles (256*4) detailed in the manual equating to 128bytes.

    It does clearly say in the doc that...
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    Not sure that can be right Larry - the file size...

    Not sure that can be right Larry - the file size becomes 256 bytes rather than the 128 byte file I produced that I think I need for the 265*4 prom....?
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    Can someone please sanity check this PROM .bin...

    Can someone please sanity check this PROM .bin file for me against the spec contained in the N* Technical Manual please - table 4-12 on page 4-33.

    It should represent what I believe are the...
  22. Replies
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    I think you (and Dave) are right Dwight. I know...

    I think you (and Dave) are right Dwight. I know from some other users with USA 110V Advantages in the UK, they run just fine on step down transformers without apparently changing the PROM's (already...
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    Thanks Mike - looks a little cheaper than Mike...

    Thanks Mike - looks a little cheaper than Mike Arcade who also seem to provide a programming service with the equivalent devices here:

    https://www.mikesarcade.com/cgi-bin/store.pl?sku=PROM82S129
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    Thanks Larry - yes thats really expensive. Some...

    Thanks Larry - yes thats really expensive. Some of those equivalents you listed seem a little cheaper. I don't currently have a way to program them though - my GQ4x doesn't support them.
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    Indeed. Of course I need to understand what...

    Indeed.

    Of course I need to understand what the replacement oscillator actually has to generate from the PL Sync signals than emanate from the PROM but first I need to get that PROM replaced with...
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