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  • falter's Avatar
    January 15th, 2020, 01:48 PM
    falter replied to a thread Osi c4p in Other
    I'm trying to learn programming and was advised it was best to refresh on BASIC before going to something a bit more complex like assembly. I'm...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 15th, 2020, 09:09 AM
    falter replied to a thread Osi c4p in Other
    The airport is still fogged in Dave, although I think I see the tower in the distance. :) Btw, I got this from the creator of WinOSI over on the...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 15th, 2020, 08:37 AM
    falter replied to a thread SoC MK14 in Other
    Not bad since prior to about 5 years ago I had no idea there *was* a British computer collection to be had, apart from the ZX81 doorstops! It's...
    9 replies | 203 view(s)
  • falter's Avatar
    January 14th, 2020, 12:44 PM
    falter replied to a thread SoC MK14 in Other
    Thank you for that very helpful post! Yes I've heard some uncomplimentary things about the MK14 keypad. Apparently it makes the ZX80 keyboard...
    9 replies | 203 view(s)
  • falter's Avatar
    January 13th, 2020, 04:40 PM
    falter replied to a thread Osi c4p in Other
    This is all making sense except for the angles thing. I'm not understanding how angles relative to 360 degrees get involved.. is that in relation to...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 13th, 2020, 01:32 PM
    falter started a thread SoC MK14 in Other
    This Christmas I did a bit of a purge and raised about $1000US to put towards something 'new'. So I bid on and managed to win a rare US-located...
    9 replies | 203 view(s)
  • falter's Avatar
    January 13th, 2020, 01:16 PM
    falter replied to a thread Osi c4p in Other
    Yes, that's exactly what is happening. And even the WinOSI emulator does the same thing. If you want a 'blue' tank, you'll get a blue tank, but the...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 13th, 2020, 11:58 AM
    I know sockets have their failings but I've really come to hate manufacturers that don't socket failure prone ICs like RAM. For me, it makes...
    9 replies | 159 view(s)
  • falter's Avatar
    January 13th, 2020, 09:53 AM
    Yeah personally I would check RAM. I saw your post on reddit.. my Hazeltine was going crazy like that. In my case it was one of the address decoder...
    9 replies | 159 view(s)
  • falter's Avatar
    January 12th, 2020, 08:08 PM
    falter replied to a thread Osi c4p in Other
    I just ran the same program in the WinOSI emulator and yeah, it appears that the background is dark blue. So maybe the manual is wrong and you can't...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 12th, 2020, 08:02 PM
    falter replied to a thread Osi c4p in Other
    Question for viewers. If you look at Terry's post here, would you say the background color of the X he printed there is black, or blue? The...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 12th, 2020, 01:01 PM
    Didn't see any posts about this (doesn't say much - the forum search doesn't appear to be working), but here is a good start at becoming a PET...
    0 replies | 99 view(s)
  • falter's Avatar
    January 12th, 2020, 12:59 PM
    Let me know if you ever come up with any loose expansion units. I have two Mindset but no disk drives. :)
    6 replies | 167 view(s)
  • falter's Avatar
    January 12th, 2020, 11:45 AM
    falter replied to a thread Osi c4p in Other
    Am re-reading. And re-reading. It's taking a little while to sink in, but I think I have the gist of it.
    103 replies | 2386 view(s)
  • falter's Avatar
    January 12th, 2020, 11:19 AM
    falter replied to a thread Osi c4p in Other
    Thanks Dave! Hope your business trip was more exciting than my non-business trip here. :) Terry's picture is from a real machine. It's from...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 11th, 2020, 08:30 PM
    falter replied to a thread Osi c4p in Other
    Had a thought -- what if my Commodore 1702 wasn't adjusted quite right for color? I had played with it before for my Apple II, maybe all I needed to...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 11th, 2020, 02:25 PM
    falter replied to a thread Osi c4p in Other
    And just for fun, here is the output for the 'ships' program in the manual on page 81. Compared to Terry's output, with mine on top, and his...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 11th, 2020, 01:58 PM
    falter replied to a thread Osi c4p in Other
    Okay so that was interesting. So to answer your question Dave: A=32, B=14 - Result = Solid Black background A=32, B=15 - Result = Solid White...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 11th, 2020, 12:03 PM
    falter replied to a thread Osi c4p in Other
    Cancel that. I had a hunch - an ancient 163 I had found in my parts bin and subbed in for testing. Subbed a replacement and voila... problem...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 11th, 2020, 11:58 AM
    falter replied to a thread Osi c4p in Other
    Okay so after the Back to Work Week from You Know Where, I am finally getting time to try and go through this. Unfortunately, new problem: ...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 9th, 2020, 06:05 PM
    I have the same keyboard. Intecolor offered several versions of their keyboard..something like 4.. strangely the next up from ours really only...
    1 replies | 96 view(s)
  • falter's Avatar
    January 8th, 2020, 11:12 AM
    Actually I got it. I had placed an offer as I was posting that and he accepted it. So it is safe from deskthority. I missed another microswitch...
    3 replies | 129 view(s)
  • falter's Avatar
    January 8th, 2020, 10:16 AM
    Is this the first one, circa 1971? The keyboard is so different from the others, and I don't see a 'sub-model' anywhere. ...
    3 replies | 129 view(s)
  • falter's Avatar
    January 4th, 2020, 11:36 PM
    falter replied to a thread Osi c4p in Other
    Many thanks Dave. And I am curious what you're up to with the PDP code! I didn't get much time today and actually had the machine apart as I had...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 4th, 2020, 09:48 AM
    falter replied to a thread Osi c4p in Other
    No rush at all. I very much welcome and deeply appreciate your help. You are one of the few people who can explain a circuit in a way that makes...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 3rd, 2020, 08:53 PM
    falter replied to a thread Osi c4p in Other
    Well, I got a little excited. I decided to go back at the colour board and remove the 175s and the 7400 in the top row on the card. I didn't think...
    103 replies | 2386 view(s)
  • falter's Avatar
    January 1st, 2020, 04:44 PM
    falter replied to a thread Osi c4p in Other
    I've tried about 10 74L04s so far, including some pretty recent date code ones... no change. I'm checking out the 175s and other parts of the...
    103 replies | 2386 view(s)
  • falter's Avatar
    December 31st, 2019, 02:28 PM
    Just wanted to wish everyone a safe, happy, healthful and prosperous New Year, whether it's already 2020 for you or yet to come! And special...
    5 replies | 164 view(s)
  • falter's Avatar
    December 31st, 2019, 01:32 PM
    falter replied to a thread Osi c4p in Other
    Looks like Tezza got his to produce colour (have to scroll down a ways): ...
    103 replies | 2386 view(s)
  • falter's Avatar
    December 31st, 2019, 12:06 PM
    falter replied to a thread Osi c4p in Other
    I was wondering if Red's was an actual computer or an emulation. I believe there is an OSI C4P emulator out there. I was browsing through videos...
    103 replies | 2386 view(s)
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About falter
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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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