Image Map Image Map

Search:

Type: Posts; User: dfnr2

Page 1 of 12 1 2 3 4

Search: Search took 0.01 seconds.

  1. Replies
    44
    Views
    912

    I also used a Weller until I was able to pick up...

    I also used a Weller until I was able to pick up a used Metcal, and have stuck with Metcal ever since. They hold up well, so buying one used on Ebay is a pretty safe bet.
  2. I am thinking of going with "deep dish" F and J...

    I am thinking of going with "deep dish" F and J keys. I also like bumps, but they are controversial, and out of place on most vintage machines. Deep dish is a bit more subtle, and actually feels...
  3. I think this was a pretty common architecture for...

    I think this was a pretty common architecture for keyboard scanning. However, without the diodes, the keyboard is still susceptible to "ghosting" artifacts if three keys are pressed forming three...
  4. What's the general preference in the alpha key...

    What's the general preference in the alpha key legends? A larger font centered in the middle of the key like the ADM-3A, or a smaller font centered on the bottom half of the key, like the Apple 2...
  5. OK, Still a bit of work on layout, but here's...

    OK, Still a bit of work on layout, but here's what it will look like:

    58533

    The diode per key is for n-key rollover, which the capacitive keyboard gets for free, since a capacitive keyboard...
  6. I'm still laying out the PCB, a half hour at a...

    I'm still laying out the PCB, a half hour at a time in the evenings, but should be done this week.

    The chicken-and-egg problem is that without the keycaps, it is only possible to imagine what the...
  7. Yes, those are in there. For those keys, the red...

    Yes, those are in there. For those keys, the red LED window is the second shot in the double-shot molded key, so the legends have to be pad-printed. I checked the SOL-20, and they are done the same...
  8. The keyboard will be an exact mechanical fit to...

    The keyboard will be an exact mechanical fit to the case, and also compatible with all the signals, but will not be capacitive. It will leverage the already existing ASCII encoder hardware and...
  9. That is the retail site for Signature Plastics,...

    That is the retail site for Signature Plastics, which is indeed where I'm ordering the keys from. I just got a quote back for the SOL-20 add-on set for the keycaps I'm using for the "ADM-3A" style...
  10. Replies
    11
    Views
    721

    I hadn't planned on the inverted T, but I suppose...

    I hadn't planned on the inverted T, but I suppose it would be possible to add one more switch next to the two blank keys in the photo (which will anyway be right and left arrows), and create a keymap...
  11. Replies
    11
    Views
    721

    The keycaps in the photo are custom ordered for...

    The keycaps in the photo are custom ordered for the OSI keyboard, with a few extra keys in anticipation of a more generic ASCII keyboard.

    When I finally got around to doing the ASCII encoder, I...
  12. Replies
    11
    Views
    721

    The aligners that you see in the above photos...

    The aligners that you see in the above photos also serve as fairly effective stiffeners, and seem to work well enough. They are just FR4 fiberglass PCB substrate without any traces, ordered from the...
  13. Replies
    11
    Views
    721

    The PCBs and firmware are open and hosted on...

    The PCBs and firmware are open and hosted on GitHub (but I'd wait a bit until I have a chance to test the latest hardware revs). Anyone can order the parts themselves, but I will have some kits of...
  14. I already have the layout partly done. I will...

    I already have the layout partly done. I will finish in the scraps of time I have for hobby stuff in the evenings. The keyboard will use the ASCII encoder from the unified retro keyboard project...
  15. Definitely will not forget OSI :-) Lately I've...

    Definitely will not forget OSI :-) Lately I've been turning my attention to the fallout of the great shelf failure of 2019, and directing a little TLC to those systems before putting them back up on...
  16. Any interest in a SOL-20 keyboard replacement?

    Would there be any interest in a SOL-20 keyboard replacement? I recently picked up a non-working SOL-20 which is complete except for the keyboard, and the chances of picking up a keyboard at a...
  17. Thread: Osi c4p

    by dfnr2
    Replies
    103
    Views
    2,533

    The 7404 should be pretty reliable. The use of a...

    The 7404 should be pretty reliable. The use of a 7404 effectively produces two 3-tap 30-45 nanosecond delay lines with approximately (not exactly because of the propagation delay) 180 degree phase...
  18. I agree, but not black, which would look out of...

    I agree, but not black, which would look out of place in an Apple II. But not too light, which would look weird on a C4P. A shade of gray that looks good in both systems will work anywhere. I'm...
  19. That's what I hope is the consensus.

    That's what I hope is the consensus.
  20. Here is the gray selection (ABC plastic). I'm...

    Here is the gray selection (ABC plastic). I'm leaning toward the darker grays, with some of my preferences circled. Any thoughts?

    58368
  21. Yes. The keycaps also work with the Futaba...

    Yes. The keycaps also work with the Futaba MD-4-PCS keys, which are used in the picture.

    The pictured set is designed for OSI reproductions with a few ADM extensions. The unused Shift Lock and...
  22. I'm planning on going with this, except the ESC...

    I'm planning on going with this, except the ESC is moved up next to the "1", and a 1x TAB is placed next to the "Q" key. The two keys in the lower right corner will be left and right arrow keys. ...
  23. Replies
    4
    Views
    481

    Another question, what would be more useful: ...

    Another question, what would be more useful:

    1) Putting the Apple II mounting holes on the aligner, and keeping the keyboard PCB short
    2) Putting the Apple II mounting holes on the keyboard PCB...
  24. Replies
    4
    Views
    481

    I posted this to applefritter as well, so my...

    I posted this to applefritter as well, so my apologies if you are seeing it for the second time.

    I dug out my Apple II+ and made some crude measurements. I get:

    - 4 holes, spaced 13-7/8" x 3"...
  25. Replies
    6
    Views
    358

    Just curious if upgrading a 16-bit QBUS backplane...

    Just curious if upgrading a 16-bit QBUS backplane to 22-bits involves simply wiring up the DAL16-DAL21 lines, or is there a catch?
Results 1 to 25 of 290
Page 1 of 12 1 2 3 4