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  1. Let me know what you want to sell please. ...

    Let me know what you want to sell please.

    Thanks.
  2. 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
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    Thanks - replied via PM.

    Thanks - replied via PM.
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    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
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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...
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    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.
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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...
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    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...
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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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    Plot thickens..... I better version of the...

    Plot thickens.....

    I better version of the manual and schematics is on bitsavers here: http://www.bitsavers.org/pdf/northstar/advantage/00464B_Northstar_Advantage_Technical_Manual_1981.pdf
    ...
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    Yes, I end up back there too - That PROM is key...

    Yes, I end up back there too - That PROM is key to providing the sync signals - unfortunately in the version of manual I have the second half of sheet 2 of the main circuit board schematic is...
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    Embedded in the back of the technical manual Dave...

    Embedded in the back of the technical manual Dave - http://www.classiccmp.org/dunfield/miscpm/advtech.pdf

    Page 380 bottom right corner for the output connector to the CRT and I'm working back from...
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    And then the vertical.... ...

    And then the vertical....


    https://youtu.be/BsyniX3JKGI
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    These don't look right do they....horizontal sync...

    These don't look right do they....horizontal sync first


    https://youtu.be/rMTnMCU1XLc
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    Been scoping the horizontal and vertical sync...

    Been scoping the horizontal and vertical sync signals on the mainboard and there does seem to be quite a bit of jitter on both signals.
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    Thanks Larry - not sure my programmer will...

    Thanks Larry - not sure my programmer will actually support any of those devices.

    Anyone in the UK have a programmer that can write these 256*4 PROM devices ?

    I'm still not entirely sure that...
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    I might have found the problem - there are two...

    I might have found the problem - there are two vertical timing settings for 50hz and 60hz available on this machine - there is a prom that needs to be swapped at position B14 on the board if...
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    Well, the Advatnage has turned up on my doorstep...

    Well, the Advatnage has turned up on my doorstep while I was out this morning.
    Amazingly its case is intact considering how poorly it had been packed (see photo) and the distance it has travelled...
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    Sorry Mike Yes I thought you meant boot CP/M...

    Sorry Mike

    Yes I thought you meant boot CP/M on the Advantage....
    Yes I can boot CP/M on the Horizon - you you are saying load PCFLOP on that and use the Horizon to write the Advantage boot...
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