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Type: Posts; User: dfnr2

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  1. Replies
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    I've made progress on the firmware front, and the...

    I've made progress on the firmware front, and the ASCII interface is pretty much ready for the SOL-20 keyboard. I just received the new interface PCB with the SOL-20 connector, but won't be able to...
  2. I have been working on an adaptable wood case...

    I have been working on an adaptable wood case design for single-board computers. Here's the link to some photos of a prototype.

    For simplicity, this design doesn't have a flat place on top to...
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    I spent many hundreds of hours in grad school...

    I spent many hundreds of hours in grad school working on an MRI system that was built around an RTX-2000-based controller plugged into a Windows-3.1 machine. It was running a custom version of MPE...
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    In case anyone is interested, I have taken the...

    In case anyone is interested, I have taken the liberty of cleaning up the firmware source code to make it a little easier to add and manage the programs. I have tried to maintain the flavor of...
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    Is the behavior of the BRK_DATA line with your...

    Is the behavior of the BRK_DATA line with your modification and firmware patch compatible with both the 8/a and 8/e?
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    1,779

    I've merged the virtual output layer, which lets...

    I've merged the virtual output layer, which lets the keymaps map physical resources (LEDs, output lines) to virtual outputs. That way, different keyboard layouts can control how various physical...
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    I have included a 4-pin serial connector on the...

    I have included a 4-pin serial connector on the ASCII encoder board. To use a serial interface compatible with the Kaypro would be a matter of swapping the parallel out function with a serial-out...
  8. I'm working on an open source parallel keyboard...

    I'm working on an open source parallel keyboard that will work:

    https://github.com/osiweb/unified_retro_keyboard

    The keyboard is currently in beta testing, but is pretty solid. Keycaps are on...
  9. Replies
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    2,168

    Not late at all. I've placed an order for the...

    Not late at all. I've placed an order for the keycaps and am putting finishing touches on the PCB design. The firmware works just fine, but I'm making some changes so the LEDs and output lines...
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    Progress note: The current PCB layouts and...

    Progress note:

    The current PCB layouts and firmware are up on Github.

    The keyboards included so far are:

    - Apple2/OSI/ADM3A-style ASCII
    - SOL-20

    The ASCII adapter so far has multiple...
  11. Replies
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    2,168

    This is part of a project to provide a unified...

    This is part of a project to provide a unified replacement keyboard platform for various old micros. So far, I have a keyboard that can be configured for OSI, Apple II, or a generic ASCII keyboard;...
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    I just placed a keycap order. The turn time is...

    I just placed a keycap order. The turn time is estimated to be around 12 weeks. Stay tuned.

    Dave
  13. @Al, good to know of a good source of keycaps. ...

    @Al, good to know of a good source of keycaps. Many vintage layouts, including DEC terminals and HP machines, used the Selectric-style layout, and these keycaps can be the basis for keyboards with...
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    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.
  15. 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...
  16. 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...
  17. 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...
  18. Replies
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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