MTX 512 Black screen (of death?)

About original Memotech hardware.
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JonB
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Joined: 08 Nov 2013 11:16

Re: MTX 512 Black screen (of death?)

Post by JonB »

Not as useful as a Z80 ICE, but it can show timing information too. Also handles 68000 (with a different adapter box and clip).

Here's a random shot of some timing captures.

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It's very old and quite rare - there are no documents about it anywhere on the Internet, so you have to work out how to use it yourself. Fortunately it's reasonably logical. Mark will remember it from when I started repairing computers (there's a thread on StarDot about it - https://stardot.org.uk/forums/viewtopic.php?f=45&t=9732 ). Actually I think he might have one. Some fellow was selling them off a while ago, and I bought one to help the repair of my Philips P2000C luggable CP/M computer (which by the way is broken again).
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JonB
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Re: MTX 512 Black screen (of death?)

Post by JonB »

It's a work of art inside.
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JonB
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Re: MTX 512 Black screen (of death?)

Post by JonB »

So.. we can see that the only lines that are working are A0-A5 judging by the pattern in the ROM dump. I got the probe out and found that pins 2 and 3 were not connected. Guess what?

That's right, I'd bent pins 1,2 and 3 when I put the ROMS back in after selling the Rememorizer. Pin 1 was making contact I think.
That's right, I'd bent pins 1,2 and 3 when I put the ROMS back in after selling the Rememorizer. Pin 1 was making contact I think.
IMG_8005.jpg (84.26 KiB) Viewed 46 times

What a Dibley.

It's all working now.
It's all working now.
IMG_8006.jpg (100.91 KiB) Viewed 46 times



Thanks for your help, Dave and Martin!
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Dave
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Re: MTX 512 Black screen (of death?)

Post by Dave »

So, when you said . . .
JonB wrote: 02 May 2021 15:37 No bent pins on the ROM chips. :(
Strictly speaking, I suppose you were almost correct :lol:
Martin A
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Re: MTX 512 Black screen (of death?)

Post by Martin A »

oops
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JonB
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Re: MTX 512 Black screen (of death?)

Post by JonB »

Now I can't go to Memofest 2021 as you lot will take the mick..
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