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  1. Hello Ruud. I hope you found the files you were...

    Hello Ruud. I hope you found the files you were looking for.

    I have, not the ALL-03 but the All-07.

    If you mean that you have information on how to make custom device files or to control the...
  2. If you are saying that the PROM code was...

    If you are saying that the PROM code was originally programmed into multiple PROM devices (of which one failed) then you should be able to use a single EPROM programmed only with the code that PROM...
  3. I doubt whether anyone destroyed a healthy Apple...

    I doubt whether anyone destroyed a healthy Apple in order to build a Spectrum into it, the aim was obviously just to re-purpose a conveniently available wedge-shaped console to fit the computer and...
  4. It's a shame you don't have two N2s (!) so that...

    It's a shame you don't have two N2s (!) so that you could try directly 'saving' your code from one N2 while 'loading' on the other. You seem fairly sure that your problem is caused by a difference...
  5. Even when there are hardware flow control lines...

    Even when there are hardware flow control lines physically present it is usually the job of the processor, under the control of the OS low-level serial receive routines, to maintain a receive buffer...
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    Hello CP, I am here as well. The usual advice...

    Hello CP, I am here as well. The usual advice would be to check out old 'sold' listings on ebay and similar sites to see what these machines have actually sold for in the past - prices in 'currently...
  7. Terminal programs like Minicom usually have a...

    Terminal programs like Minicom usually have a 'file send' facility which, in addition to the usual 'binary' file transfer modes (Kermit / Xmodem / Ymodem / Zmodem), also usually includes the ability...
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    Polar opposite here, I liked Deus Ex (on PS2 in...

    Polar opposite here, I liked Deus Ex (on PS2 in my case) and I love games like Mass Effect, Dragon Age where you don't necessarily have to fire a shot / draw a weapon in order to get through many...
  9. You can get around PAL / NTSC issues by using an...

    You can get around PAL / NTSC issues by using an RGB connection from the computer to the monitor. Those issues only come into play when using an RF or composite video connection to the TV \ monitor....
  10. The majority of programmers have something like...

    The majority of programmers have something like 'Generic' among the choice of manufacturers. If you choose 'Generic' and then the device type (2716, 2764, 27C64, etc) it will use a slow but more or...
  11. Hi Chris - welcome to the forum and I'm so...

    Hi Chris - welcome to the forum and I'm so pleased to hear that you are recovering from your serious illness, that must be a great load off your mind.

    This is just a placeholder reply / welcome as...
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    There is no way anyone should do that to a piece...

    There is no way anyone should do that to a piece of vintage equipment, especially not with something as mechanically delicate as a floppy drive mechanism inside it. If you think the ICs need...
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    I was a Sinclair man for much of the early phase...

    I was a Sinclair man for much of the early phase of the original home computing so I came late to the Atari party. My first Atari (around 1986-87) was therefore a 520STFM, which I still have....
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    I don't know how much clearance there is between...

    I don't know how much clearance there is between the MK14 PCB and the base it is mounted on, but if you can see the track side of the PCB at the rear edge, look for edge connector contacts on the...
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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...
  19. 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...
  20. 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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