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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...
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    61 replies | 1003 view(s)
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    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.
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    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...
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    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...
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    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...
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    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...
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    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...
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    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: ...
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    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...
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    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...
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    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...
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    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...
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    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
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    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: ...
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    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...
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    61 replies | 1003 view(s)
  • falter's Avatar
    December 12th, 2019, 01:14 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 12th, 2019, 08:06 AM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 10:05 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 09:37 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 08:02 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 07:54 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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,...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 11:27 AM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 10:00 AM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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. ...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 11th, 2019, 09:19 AM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 10:34 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 10:08 PM
    falter replied to a thread Adding NOPs in Vintage Computer Programming
    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: ...
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    40 replies | 765 view(s)
  • falter's Avatar
    December 10th, 2019, 09:46 AM
    falter replied to a thread Microsoft reeeeaaaallly wants to stamp out local user accounts in General Off Topic
    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...
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    9 replies | 286 view(s)
  • falter's Avatar
    December 9th, 2019, 09:22 PM
    falter started a thread Microsoft reeeeaaaallly wants to stamp out local user accounts in General Off Topic
    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...
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    9 replies | 286 view(s)
  • falter's Avatar
    December 9th, 2019, 07:00 PM
    falter replied to a thread First YouTube video experience in General Off Topic
    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...
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    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...
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    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
0 Comments
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
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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
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All hail the $3000 Apple II+!

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