Author Topic: Problems with CPC plus  (Read 3572 times)

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Offline Devilmarkus

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Problems with CPC plus
« on: 13:20, 18 May 10 »
Hi!
I have a little question... Perhaps somebody encountered the same problem??!

My CPC+ works fine for games and so.

But I tried the 2 demos "Sappy" and "Ukonx hate beats"
- Sometimes these demos deny loading (Sappy turns into red screen, Ukonx simply stops loading)
- When i only reset the CPC, it's possible that the demos load then well.

Does anyone have an idea why this happens? Problems in ASIC?
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Offline fano

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Re: Problems with CPC plus
« Reply #1 on: 13:35, 18 May 10 »
Never had problems of this type with theses demos.Maybe their disk routines do not accept any error...
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Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #2 on: 13:44, 18 May 10 »
Well "hate beats" seem to be a simple data disk :)
Sappy I am not sure.

BTW.: The memory seem to work fine (all 128k) I tested with a memchecker and Rick Dangerous 128+ works well, too
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Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #3 on: 19:31, 18 May 10 »
Found the problem.
Bad disk drive ;)

Opened it, disassembled, cleaned each part, re-assembled, checked again:
Works fine now.
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Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #4 on: 20:40, 18 May 10 »
Who can tell me which function does this potentiometer have on plus PCB?

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Offline woody.cool

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Re: Problems with CPC plus
« Reply #5 on: 21:29, 18 May 10 »
Unable to see the picture  ???

Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #6 on: 21:30, 18 May 10 »
Unable to see the picture  ???

better now?
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Offline woody.cool

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Re: Problems with CPC plus
« Reply #7 on: 21:32, 18 May 10 »
Pic ok mow.


Not very sure on that ........ may be tempted to have a play with my Plus to see what it does (get ready for a post saying that I've screwed my 6128 Plus up)

Offline Gryzor

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Re: Problems with CPC plus
« Reply #8 on: 10:14, 19 May 10 »
Oooh I wouldn't do it :D Where do the lines lead to?

Btw, what was wrong with the drive? IIRC you had already disassembled it? :)

Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #9 on: 10:55, 19 May 10 »
Btw, what was wrong with the drive? IIRC you had already disassembled it? :)

It still seem to be wrong.
Normal DATA disks are no problem for it.
But loaders like "Ukonx Hate Beats" or "Sappy" still fail.
The Disk is ok. (Transferred back to DSK and checked in WinApe)
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Offline orange

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Re: Problems with CPC plus
« Reply #10 on: 11:51, 19 May 10 »
well did you use the same drive? maybe heads are misaligned..

Offline arnoldemu

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Re: Problems with CPC plus
« Reply #11 on: 11:55, 19 May 10 »
It still seem to be wrong.
Normal DATA disks are no problem for it.
But loaders like "Ukonx Hate Beats" or "Sappy" still fail.
The Disk is ok. (Transferred back to DSK and checked in WinApe)
Well, could you ask Leonie to "talk" to it in her nice polite way? And then maybe it will be forced to work ok all the time ?
;)
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Offline Bryce

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Re: Problems with CPC plus
« Reply #12 on: 12:05, 19 May 10 »
Hi Markus,
        the Variable Resistor in your picture is VR101 (1K) and it is there to adjust the value of the luminance output to the monitor. It wouldn't break anything if you turn it. But if you are happy with the picture quality leave it where it is, it certainly wont solve the issue you're having.

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Offline Gryzor

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Re: Problems with CPC plus
« Reply #13 on: 14:01, 19 May 10 »
Hi Markus,
        the Variable Resistor in your picture is VR101 (1K) and it is there to adjust the value of the luminance output to the monitor. It wouldn't break anything if you turn it. But if you are happy with the picture quality leave it where it is, it certainly wont solve the issue you're having.

Bryce.

This is interesting... but the monitor already has a potentiometer, don't it? So you can have a wider margin?

Offline Devilmarkus

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Re: Problems with CPC plus
« Reply #14 on: 14:02, 19 May 10 »
This is interesting... but the monitor already has a potentiometer, don't it? So you can have a wider margin?

Well I think luminance is for grey monitor.
The potentiometer does not have any effect on colour screen.
« Last Edit: 14:18, 19 May 10 by Devilmarkus »
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Offline Bryce

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Re: Problems with CPC plus
« Reply #15 on: 17:54, 19 May 10 »
Correct, The LUM (Pin 3) isn't connected on colour Plus (CM14) monitors. On monochrome plus monitors (MM12), the luminance signal is indirectly fed through the Contrast potentiometer (which is technically a sub-system of Luminance), but has a slightly different effect on the signal. VR101 may also have been required due to different versions of the monitor / Modulators or even a sign of Amstrads SCART plans (as the GX4000 offered) or even because the CPC+ plus design was being done before or independent of the monitor development, so there were "unknowns"? Either way, it's no harm to have it, and if you do have monochrome picture quality issues, giving it a turn (or just cleaning it) might help :)

Bryce.
« Last Edit: 17:56, 19 May 10 by Bryce »