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    We wished! No, the VDU is simply a bit of...

    We wished!

    No, the VDU is simply a bit of hardware which reads 512 bytes of the machine's maximum possible 640 bytes and renders the contents as either graphics or characters. What that 512 bytes...
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    True, and I wouldn't want to be doing mods like...

    True, and I wouldn't want to be doing mods like track cuts on a very valuable 40+ year old antique machine. Possibly the least intrusive / destructive way to connect a VDU to an original MK14 would...
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    The original monitor was actually byte for byte...

    The original monitor was actually byte for byte the same as the 'SCMPKB' OS for the slightly earlier National Introkit (with added on keyboard and display). That is because the MK14 was directly...
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    In recent years two or three people have been...

    In recent years two or three people have been producing replica PCBs, but even built replicas often go for 200-300 due to the fact that all the parts take some finding and bringing together, once...
  5. I still run two Atom-based Dell Mini 10Vs and I'm...

    I still run two Atom-based Dell Mini 10Vs and I'm in the process of replacing their DC power sockets, and while I'm doing that, upgrading them to 2GB of RAM. Both ran Windows XP originally, one still...
  6. This could also be written in Python, which is...

    This could also be written in Python, which is available (free) for all sorts of platforms including for Windows and for Linux, including the Raspberry Pi. It might be useful to know what OS the OP...
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    Further developments, thanks to an observant user...

    Further developments, thanks to an observant user over on the Vintage Radio forums - it turns out that the purpose of the CA 08 instruction at 0046 is to clear the ninth display cell, which of course...
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    Just found it - I wrote a quick bit of Python to...

    Just found it - I wrote a quick bit of Python to compare the two files and the MK14 'Old OS' file that I have has a one-byte difference in it, at hex address 0046.

    In the SCMPKB file and also...
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    Not sure, that is, in part, why I prod this...

    Not sure, that is, in part, why I prod this thread occasionally. He / They did say they were busy.

    I did consider relays but I don't know off hand what the output current limit from the Arduino...
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    After a bit of thought, here is one way to make...

    After a bit of thought, here is one way to make sure the -12V supply is only applied to the PROM whenever the +5V supply is applied:

    57410

    Whenever the Arduino itself is powered, that powers...
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    As a minor contribution to this thread I have put...

    As a minor contribution to this thread I have put together (OK, thrown together) a PROM reader specifically aimed at reading the SCMPKB PROM, although it could be used to read any other small PROM...
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    Without even looking in detail, those are going...

    Without even looking in detail, those are going to be the TOS ROMs as there aren't another six unique-but-similar sized chips in the machine. The '256' portion of the 'RP' number marks them out as...
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    Since the unit already has a rather...

    Since the unit already has a rather unconventional clock arrangement, how do you feel about the idea of planting a larger capacitor across the 680pF to slow the clock right down in order to make...
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    Welcome back, GabrielVond. I know the UNOs of...

    Welcome back, GabrielVond.

    I know the UNOs of course but not the Mega 2650 or the Due. Since you own such a good selection of Arduinos you are obviously very comfortably familiar with them and I'm...
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    Before looking for anything more complicated, be...

    Before looking for anything more complicated, be aware that it is sometimes surprisingly easy to plug the 13-pin monitor plug into an ST upside down. You might not think it possible but the extra...
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    As unconventional as it looks, that capacitor...

    As unconventional as it looks, that capacitor looks as though it was always there so it's useful to know that the resulting frequency comes to under 1Mhz. Strange thing to do though, when all...
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    Yes! Post #41, you mentioned you thought you...

    Yes!

    Post #41, you mentioned you thought you had spotted a broken wire in the photos, so we're all ears / eyes.

    I'm not sure that Gabriel has the same interest in this as we obviously do,...
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    For the sake of clarity, I am sure that sentence...

    For the sake of clarity, I am sure that sentence was meant to read "With the board powered OFF and the meter set to read resistance.."

    Whatever scheme the the 74154 is involved in, it must have...
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    A while ago, TCFCH produced this informative (and...

    A while ago, TCFCH produced this informative (and occasionally slightly inaccurate) video about the Introkit's immediate descendant, the MK14.

    https://www.youtube.com/watch?v=O_vhWxu-spA

    The...
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    As I mentioned, the IC missing (and apparently...

    As I mentioned, the IC missing (and apparently never fitted) from the group in the Printed Circuit area on Gabriel's Introkit PCB is a 74C00 on TNMOC's Introkit, which does have it fitted. (If that's...
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    Correction to the above: The MM5214 is the PROM,...

    Correction to the above: The MM5214 is the PROM, so of course that part does feature in the Introkit as well.
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    Ah, the cavalry has arrived back (in the form of...

    Ah, the cavalry has arrived back (in the form of daver2). Now things will really get going...

    I thought I had spotted the 81LS95 on Gabriel's PCB but that was just late night eyesight, so its...
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    And again, you actually posted #29 before I...

    And again, you actually posted #29 before I posted #30. I got your PM by the way, but by the time I did, your post #29 had already appeared here in the forum, so I am replying to it here.

    Can you...
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    Gabriel, you may or may not be aware that as a...

    Gabriel, you may or may not be aware that as a new user your posts are time and date stamped with the time you post them, but then they are held for a moderator to look at them, and then when they...
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    I've marked up Gabriel's images of his Introkit...

    I've marked up Gabriel's images of his Introkit with the power connections as detailed in the previous post, attached below.
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