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Type: Posts; User: David_M

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  1. Replies
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    No it only supports 5.25" floppy images. If...

    No it only supports 5.25" floppy images.

    If you want a hard drive emulator I just started shipping my new hard drive emulator card with beta firmware that can be updated in system with a...
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    I'm still waiting on the new board order to...

    I'm still waiting on the new board order to arrive but I have two left from the last order. PM me.


    I based my design on this
    https://github.com/suaide/SDisk2/tree/master/firmware



    No but...
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    I did a layout of the updated design a few months...

    I did a layout of the updated design a few months back I sold the 30 I had made mostly as bare boards.
    I have another 20 coming that I tacked on to the order for the production cards of the hard...
  4. I'm surprised that people are blaming the CRT and...

    I'm surprised that people are blaming the CRT and the yoke when in post #2 the OP mentions a missing diode and a broken diode. The diodes are used to suppress ringing in the deflection coils.

    Why...
  5. I'd replace the diodes before I started blaming...

    I'd replace the diodes before I started blaming the yolk. The diodes are damper diodes to prevent the deflection voltage across the coil going negative and ringing, which is what I suspect is...
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    I think is is done in resin and not injection...

    I think is is done in resin and not injection molded
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    In theory that is how they are meant to fail and...

    In theory that is how they are meant to fail and when they fail that way they blow the fuse.


    In reality they fail OC and blow stinky brown goo all over the place and the supply keeps on working....
  8. How is your butthurt coming along. I hope it is...

    How is your butthurt coming along. I hope it is healing now.
  9. Replies
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    I'm just doing the final testing phase of a...

    I'm just doing the final testing phase of a quikLoader redesign, it is currently fully compatible with the original card and does not need an external, eprom programmer. I understand your DOS has...
  10. You make a lot of assumptions, unfortunately most...

    You make a lot of assumptions, unfortunately most of them are wrong.
  11. There are no stability issues other than faulty...

    There are no stability issues other than faulty RAM chips. As "crude" as it is I was able to make it work with just the page from the saturn manual... you apparently can't. So forgive me if I don't...
  12. I created a Saturn card last year and some...

    I created a Saturn card last year and some lowlife in Russia has already ripped off the design and is selling poor quality pcbs.
    Why redo it again? It would be far more useful to find another card...
  13. A read or write will activate the soft latches so...

    A read or write will activate the soft latches so peek or poke will work.

    There is a page in the Saturn card documentation that details how the soft switches work, I used it to design the...
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    On the Saturn Reboot I combine the WR signal with...

    On the Saturn Reboot I combine the WR signal with Q3 effectively delaying WR being asserted until midway through the CPU phase and that solved timing issues on some clones that had issues. The same...
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    At the moment the flash is not going into command...

    At the moment the flash is not going into command mode so we cant even get a chip ID from it. So something about the write cycle timing it doesnt like.
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    I'm currently doing a reboot of the quikloader...

    I'm currently doing a reboot of the quikloader cards. I'm having issues with getting the flash rom to behave correctly to allow writing to it but the prototypes work happily with the flash programmed...
  17. If youi are able to program an eprom, use this in...

    If youi are able to program an eprom, use this in place of the EF ROM.
    It will show you which RAM's are faulty.

    https://drive.google.com/open?id=1MvfdtR32h-RjDYZ9NFA4t71CUkL3s6Ta

    Even if all...
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    You will never identify most clones and here is...

    You will never identify most clones and here is why. Laying out a pcb was done by hand taping back then, it was a very expensive process. Large numbers of boards had to be produced to make it...
  19. I'll take some measurements if I open up the...

    I'll take some measurements if I open up the keyboard unit again.

    Good news, one of the systems is on it's way home with a very happy owner. The system with the 8" disks is working and booting...
  20. While waiting for the owner to arrive with more...

    While waiting for the owner to arrive with more disks I decided to try and find the boot ROM entry for the Morrow disk controller and the the 8 inch system.
    From what I could find the disk...
  21. The owner of the machines is dropping by on...

    The owner of the machines is dropping by on Sunday with more disks to try. I'll let you know how that works out.
  22. The code looks good and from what I could find...

    The code looks good and from what I could find online BC00 is the correct address.
    The disk is hard sectored and unknown if it is good or not. It could be the disk, drive or the controller that is...
  23. Some more progress, both S-100 units appear to be...

    Some more progress, both S-100 units appear to be working now. The RAM card is recognised in both units so it it also working.

    Issuing the command "GO BC00" with the micropolis disk controller...
  24. The issue of hot swapping has long been...

    The issue of hot swapping has long been exaggerated mostly it comes from the issue of inserting or removing a card or cable unevenly causing pads to bridge to adjacent connectors. The sorcerer has a...
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    The production boards arrived today and are ready...

    The production boards arrived today and are ready to ship.
    Bare boards are US$10 + $3.50 postage
    PM me if interested.

    48370
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