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    Core memory : single core datasheet

    Not that I expect anyone to have a need for it, but just for the heck of it :

    here are a few datasheets for single cores ( From a Philips Databook 1973 )
    ...
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    No, relisted directly in ebay.com, instead of...

    No, relisted directly in ebay.com, instead of ebay.de.

    https://www.ebay.com/itm/SWTPC-DMAF1-DMA-F1-8-floppy-controller/143269994488

    Now it doesn't show up in ebay.de, although I do ship...
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    Relisted, in a probably vain attempt to have this...

    Relisted, in a probably vain attempt to have this item show up in the US-site of Ebay.

    Ebay used to be easier...
    Jos
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    Selling a SWTPC DMA F1 controller card

    Thinning the todo list....

    Therefore I am currently selling an unneeded, untested, SWTPC DMA F1 controller card.
    This is needed when connecting 8" floppy disks to a SWTPC system.

    Shipping...
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    That is a Philips TX400, nicknamed "dog house"....

    That is a Philips TX400, nicknamed "dog house". The very first commercial TV receiver from Philips.
    Roland will no doubt chime in to correct me !....

    Nice work on the RK05 Roland, happy to see...
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    Indeed, these tongue pads will disintegrate and...

    Indeed, these tongue pads will disintegrate and smear the R/W heads. Only use the cleaning disk : wet it with the cleaning agent, or a bit of pure alcohol, insert and try to read the disk. This...
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    w.r.t the 8" cleaning set : I have the same...

    w.r.t the 8" cleaning set : I have the same set.
    Do not use the tongues : these are degraded by now and can leave a sticky residue on the RW heads.
    It is OK to use the rest of the set, i.e. the...
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    Maggi, seems you are located .DE There are...

    Maggi,

    seems you are located .DE
    There are several people who will volunteer to image these disks for you ( and us...), depending on your exact location.
    As Al said it would be good to have...
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    ...strange seeing some Datapoint stuff inside...

    ...strange seeing some Datapoint stuff inside this heap...
  10. Thanks to GSP, a 20 $ item bought on Ebay hast...

    Thanks to GSP, a 20 $ item bought on Ebay hast cost me nearly 100$. For small items, GSP is a major PITA.
    I also see wildly different GSP prices for similar items. Looks I will be doing much less...
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    Sadly I do not have a Sage. Passed on a 100$ USD...

    Sadly I do not have a Sage. Passed on a 100$ USD Sage-II some 15 years ago " I'll find a cheaper one".

    And I did find, some years ago an ad "Free to good home : Sage IV, with terminal, disks and...
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    3D printing new belts

    Just a heads-up that I successfully 3D-printed a replacement belt for an 8" floppy drive. I used "Ninjaflex", a special filament to produce soft objects. There are other, similar, flexible materials...
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    Some rarer SWTPC boards.

    Currently checking out a SWTPC, to be sold in the upcoming autumn cleanup.
    I noticed mine has quite a few rare SS50/SS30 boards :

    - Memory is 4 PCB's from "American Computer works", based in...
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    What would be a fair price for the whole shebang...

    What would be a fair price for the whole shebang ?
    The 200 Euro I offered was not enough, could be worth more but then you'd need to know condition, actual specs etc etc

    Jos
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    ..traced to a defective 6800 AND a defective...

    ..traced to a defective 6800 AND a defective 6871.....

    So both variants are now up and running.
    Running very slowly, that is ....not the fastest BASIC I ever used...

    Now to find a way to save...
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    Thanks for the ROMS Dave ! Aannndddd : sucess...

    Thanks for the ROMS Dave !

    Aannndddd : sucess !

    Here is the populated PCB :
    50949
    ...connected to a Linux laptop running xterm in TEK4014 mode :
    50950
    The resulting Snoopy is somewhat off,...
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    Would some kind soul be willing to set online /...

    Would some kind soul be willing to set online / send me binaries for the BASIC ROM / DDT rom for the Board Bucket ?

    Thanks... Jos
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    Man those Chinese are quick..... 50836 No...

    Man those Chinese are quick.....

    50836

    No time yet to finish build description, GAL equations and Eprom contents...

    Jos
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    And the second board : display / keyboard also on...

    And the second board : display / keyboard also on Eurocard size ( 160x100 mm)

    Can be build as a MEK6800D2 functional copy. However I added extra keys & display.
    As Dave mentioned in one of the...
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    Hi Dave, thanks for your input! Please meet...

    Hi Dave,

    thanks for your input! Please meet JP7 at pin 35 of the CPU !

    50541

    JP4 / A13 is there to enable the use of a 6264 SRAM. I have loads of those...
    I already put CTS on the spare...
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    My BitBucket rebuild is coming along slowly, but...

    My BitBucket rebuild is coming along slowly, but nicely...
    It is a standard Eurocard size. 160x100 mm

    50536

    Hopefully not too many design errors, I hate trowing away PCBs.

    To be...
  22. Anyone have IBM System 32 card cage picture ?

    I seem to have located a bunch of PCBs from an IBM System 32.

    See ftp://ftp.dreesen.ch/IBM_S32

    Anyone has a picture of what a complete CPU would look like ? Would like to attempt to have a...
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    Took a bit longer than expected, but here it is...

    Took a bit longer than expected, but here it is : the first drawing of what I intend to put on an Eurocard sized PCB (100x160 mm )

    ftp://ftp.dreesen.ch/TEK_BB/BB.pdf

    It should be sufficient...
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    So for the BitBucket replica : - My target is...

    So for the BitBucket replica :

    - My target is to have an internal board running this DDT / Basic combo inside my TEK4014. This is to be standalone : i.e. I will just use power and the serial line...
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    So I have a Tek4014, which has plenty of unused...

    So I have a Tek4014, which has plenty of unused room inside.....

    ...and I see a lot of progress being made on this Tek Bit Bucket....

    .. I feel ( yet another...) project coming up....

    So...
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