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Type: Posts; User: Hugo Holden

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    Thanks !

    Thanks !
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    I've just realized the perfect candidate was in...

    I've just realized the perfect candidate was in front of us the whole time, Weird Al Yankovic, you must watch his music video which outlines some of his qualifications, for example:

    There's no...
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    Mike, Rather than just using the .com program,...

    Mike,

    Rather than just using the .com program, I sent the the .asm to the SOL, it took a while with PCGET as its a 64k file. Then I assembled and loaded it without problems which was very nice.
    ...
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    That reminds of some Offspring song lyrics,...

    That reminds of some Offspring song lyrics, Pretty Fly for a white guy:

    He needs some cool tunes, not just any will suffice
    But they didn't have Ice Cube so he bought Vanilla Ice
    Now cruising in...
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    That reminds me of Schrodinger's Cat. It would...

    That reminds me of Schrodinger's Cat. It would possibly be better to never look inside the box (Turn the KIM-1 or PET on) and be prepared to face the disappointment that one of those IC's was dead,...
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    Now I see, thank you. I seem to suffer from...

    Now I see, thank you.

    I seem to suffer from some sort of "spare parts disease". I have to have spares of all the less common IC's in my vintage computers and other apparatus, and at least be able...
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    Dave, What a beautiful job you have done. A+...

    Dave,

    What a beautiful job you have done. A+

    Hugo.
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    Dwight, I know little about the IC's in the...

    Dwight, I know little about the IC's in the KIM-1. Are you saying that it contains IC types that have become truly impossible to get and that they are often faulty, requiring some sort of add on...
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    Have a look at this one: ...

    Have a look at this one:

    https://www.ebay.com/itm/APPLE-1-Original-1976-Computer-System-1st-Steve-Wozniak-designed-computer-and/174195921349?hash=item288ee2d1c5:g:UNoAAOSwWqtdrkDz
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    Yes, you are then looking for those same...

    Yes, you are then looking for those same undulations across the 63uS scan time. If it is say a disturbance coming through the video amplifiers or on their power supply. When checking for this, the...
  11. Years ago a friend found some dozens of small...

    Years ago a friend found some dozens of small miniature double triode tubes. So we got the idea to make them into flip flops and logic logic circuits to make a digital clock that had a low frequency...
  12. So one of your AMI UART chips was definitely...

    So one of your AMI UART chips was definitely intermittent and the partial file transfer fault completely went away when you replaced it ?

    This is really important information or a person could...
  13. I think the Killer poke myth got busted, as it...

    I think the Killer poke myth got busted, as it applies to damaging a VDU as I recall, but there could be an issue, if it was able to get IC output stages on the same line to fight each other for an...
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    Vintage computer prices.

    A while back I was thinking of getting a KIM-1 computer. One reason was that I found an article where the KIM could be used in a project to program the MM5204 UV eproms used in my SOL-20. I was about...
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    As I recall the data bit (just 0 or 1) from the...

    As I recall the data bit (just 0 or 1) from the the Matrox's ALT-512 RAM array is extracted by setting the RAM address for the pixel location and it is loaded to a latch. The PRDY output from the...
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    That is handy. I will try it. At least I know how...

    That is handy. I will try it. At least I know how to check it if it malfunctions. When it is working there should be zero cpu activity when the prdy is asserted by the Bytesaver, and its easy to see...
  17. I saw a couple of photos that reminded me of how...

    I saw a couple of photos that reminded me of how both wire wrapping and some styles of point to point soldering are really both not good (in my humble opinion).

    In the case of wire wrap, although...
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    Mike, The read operations on the Matrox card...

    Mike,

    The read operations on the Matrox card are through an I/O port.

    One thing I was reading about the SOL-20, in a magazine article somewhere, somebody remarked that there were too few S-100...
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    I just looked up my notes on it since it has been...

    I just looked up my notes on it since it has been a while:


    The PRDY driver circuit in the SOL is a tristate driving the PRDY line, the tristate input (U71, pin12) is driven by a flip flop U70,...
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    I found when running a small program to read the...

    I found when running a small program to read the video RAM contents out of the Matrox card and into general RAM, from time to time the SOL asserted the PRDY line, fighting the PRDY output from the...
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    Yes that is the way the line is supposed to work...

    Yes that is the way the line is supposed to work or be used, but in the SOL motherboard they drive that line from the output of a buffer that pulls it high or low at times and this fights with any...
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    Wow ! That is excellent, I can't wait to try it.

    Wow ! That is excellent, I can't wait to try it.
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    Thanks Dwight, all makes sense, but I don't...

    Thanks Dwight, all makes sense, but I don't understand what "reset" you are referring to.
    Is it exiting the program, if so I can easily exit to a Solos warm boot.
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    Also LD A,0FFH should be MVI A,0FFH I guess and...

    Also LD A,0FFH should be MVI A,0FFH I guess and LD A,H should be MOV A,H and OR should be ORA.

    I'll have to go over it very carefully. There is also JR that I can't see in my 8080 book, it...
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    Thanks Dwight, That would have taken me a 100...

    Thanks Dwight, That would have taken me a 100 times longer, or more.
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