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  • falter's Avatar
    Today, 01:46 PM
    falter replied to a thread Microkit 8/16 in Other
    I am working on an adapter. I have also been playing around with the 'reader' I found for my dg unit (not with the Microkit EPROM but with a bunch...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 07:10 PM
    falter replied to a thread Microkit 8/16 in Other
    Sorry... my first line - all the purple wires from 1-3, and 17-21 of the ROM socket go to pins 11-19 of one 74ALS541N.
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 03:25 PM
    falter replied to a thread Microkit 8/16 in Other
    I am feeling pretty certain this board is wired for a 1702. Thankfully whoever did this used colored wires to make it easy to follow. Here's what...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 02:49 PM
    falter replied to a thread Microkit 8/16 in Other
    Oh no. But what I will do is try tracing some telltale pins like voltage and see what is being put out. If I find a -9v pin that would be a...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 02:24 PM
    falter replied to a thread Microkit 8/16 in Other
    Did you look at the pic I posted of that digital group proto board Dave? I'm trying frantically to find Marty's words on what it was but I could...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 02:23 PM
    falter replied to a thread Microkit 8/16 in Other
    The only other machine I know has a 1702 is my OSI 500 board.. but I believe it uses those for boot as well. I'm very tempted to buy that solid...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 02:00 PM
    falter replied to a thread Microkit 8/16 in Other
    Yes, enabled is always on. It only goes off if you do RESET. I tried to get crafty and put the 1702 into my digital group machine, hoping it...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 01:51 PM
    falter replied to a thread Microkit 8/16 in Other
    BTW, I've posted a couple pics of the keyboard out of case for those curious: ...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 01:39 PM
    falter replied to a thread Microkit 8/16 in Other
    Nevermind.. the Break key is fine. I opened up and tested with a multimeter. Tested a bunch of keys and they all seem to work pretty good. Perhaps...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 01:32 PM
    falter replied to a thread Microkit 8/16 in Other
    When I power up, enabled is already lit. BRK has no effect at all as far as I can tell. Now, this is one of those capacitive foam keyboards, so...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 10:22 AM
    falter replied to a thread Microkit 8/16 in Other
    Well changing out a 555 is no big deal, if that's what you're thinking. I have a bad feeling the only way this thing operates for us is if we find...
    61 replies | 1003 view(s)
  • falter's Avatar
    Yesterday, 08:48 AM
    falter replied to a thread Microkit 8/16 in Other
    Nice work! I regret I don't have a logic analyzer nor a 1702 burner. I have been gathering parts to build one. I have also seen Arduino based...
    61 replies | 1003 view(s)
  • falter's Avatar
    December 13th, 2019, 07:15 PM
    falter replied to a thread Microkit 8/16 in Other
    Scans are done Dave and are in my main google drive folder: https://drive.google.com/drive/folders/1JDffZkSxbQMPGIf1ewixEbOAe8V6Nb55?usp=sharing
    61 replies | 1003 view(s)
  • falter's Avatar
    December 13th, 2019, 04:51 PM
    falter replied to a thread Microkit 8/16 in Other
    Ok here is what I get with the 8216s out, and it is the same each time I power up: ...
    61 replies | 1003 view(s)
  • falter's Avatar
    December 13th, 2019, 01:35 PM
    falter replied to a thread Microkit 8/16 in Other
    Fantastic Dave, thank you. I will get the machine set up here and report back on what I find. That would be really neat if we could 'crash' it...
    61 replies | 1003 view(s)
  • falter's Avatar
    December 12th, 2019, 01:14 PM
    Oh it'll probably be on the video I've been working on! Assuming I ever finish it. I did a final cut but just felt like I wanted to show more of...
    40 replies | 765 view(s)
  • falter's Avatar
    December 12th, 2019, 08:06 AM
    Ahhhhhh.. thank you Dave! I just wasn't understanding why you'd load a memory address in when you hadn't given it any value. Ok.. I will try...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 10:05 PM
    I did! I didn't even have it that high to begin with. It was just a very sharp tone. I'm slowly picking up on programming this thing. I think I...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 09:37 PM
    Wow that was loud. :) https://youtu.be/pWp5ExhUF5U So yeah, my hunch was right. I tried another run with my Realistic, and zippo. But then...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 08:02 PM
    I was reading up online about the stereo.. it says something about it being 'digital synthesized'. Not sure if that's relevant. Can't find anything...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 07:54 PM
    Yes, I finger tested the amp, and it was quite pronounced. So I think that is working ok. Regarding the scope, and please forgive my ignorance,...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 11:27 AM
    Heh. Did I mention I got a grant pass in math? :) I literally go almost dyslexic with this stuff. Thank you for clarifying. Okay. Hmm... I...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 10:00 AM
    Thanks guys. I will try to scope this. I'm still trying to understand what they're telling me: "This loop takes 14 machine cycles to execute. ...
    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 09:19 AM
    Thanks guys! Ok I will try adding a ton more NOPS. Those switches are murder on the fingers. I was trusting the manual. I didn't pick up even the...
    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 10:34 PM
    Another possibility I suppose is that the stereo I'm using is not suited.. it's an early 90s Realistic unit.. think it might be digital. I do have...
    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 10:08 PM
    So I finally got around to trying the program, and modified it for the required NOPs as thus (left column is address, right column is OP code/data: ...
    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 09:46 AM
    I get there can be some upside to having an online account. I just feel like I'm overexposed as it is, and after several major breaches I'm...
    9 replies | 286 view(s)
  • falter's Avatar
    December 9th, 2019, 09:22 PM
    Just clean installed Win 10 1909 and, yup, they yanked the Local Account option. Knew this was coming, of course. Microsoft seems to have a...
    9 replies | 286 view(s)
  • falter's Avatar
    December 9th, 2019, 07:00 PM
    That's kind of funny, in a way, that the owners (taxpayers) of a public broadcaster (BBC) have to fear copyright lawsuits for using material they...
    25 replies | 644 view(s)
  • falter's Avatar
    December 9th, 2019, 02:24 PM
    falter replied to a thread Microkit 8/16 in Other
    Nevermind.. just got a note back from the seller. I had asked them about that plug attached to the keyboard and apparently that *is* for composite...
    61 replies | 1003 view(s)
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About falter

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About falter
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Vancouver, BC

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Recent Entries

MPI 360k won't read/write

by falter on August 17th, 2019 at 11:18 AM
Quote Originally Posted by Chuck(G) View Post
I can't say that for certain. The head assembly is a complex system. The only way to have an inkling is to use something like IMD and check each head individually.
IMD says RPM are 272... should be 300 right?
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74LS244 Question

by falter on December 5th, 2018 at 01:21 PM
Quote Originally Posted by Chuck(G) View Post
Assuming that pin 1 stays high, it should be possible to "feed through" pin 8 to pin 12. But the solution ultimately will be figuring out why pin 1 stays high.
Yeah that is is the goal for sure. I just want to prove out my theory a bit. After the experience with the TVT I don't trust schematics or circuit descriptions 100%. I did try feeding through but didn't see any text appear... although I didnt type anything so maybe it would only change new text being added. I'm

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The Ebay Follies

by falter on June 25th, 2017 at 11:09 AM
All hail the $3000 Apple II+!

http://www.ebay.com/itm/142424958928
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