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avatar_Devilmarkus

Problems with CPC plus

Started by Devilmarkus, 11:20, 18 May 10

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Devilmarkus

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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fano

Never had problems of this type with theses demos.Maybe their disk routines do not accept any error...
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Devilmarkus

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
When you put your ear on a hot stove, you can smell how stupid you are ...

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Devilmarkus

Found the problem.
Bad disk drive ;)

Opened it, disassembled, cleaned each part, re-assembled, checked again:
Works fine now.
When you put your ear on a hot stove, you can smell how stupid you are ...

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Devilmarkus

Who can tell me which function does this potentiometer have on plus PCB?

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woody.cool

Unable to see the picture  ???

Devilmarkus

When you put your ear on a hot stove, you can smell how stupid you are ...

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woody.cool

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)

Gryzor

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? :)

Devilmarkus

Quote from: Gryzor on 08:14, 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)
When you put your ear on a hot stove, you can smell how stupid you are ...

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orange

well did you use the same drive? maybe heads are misaligned..

arnoldemu

Quote from: Devilmarkus on 08:55, 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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Bryce

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.

Gryzor

Quote from: Bryce on 10:05, 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.

Bryce.

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

Devilmarkus

#14
Quote from: Gryzor on 12:01, 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.
When you put your ear on a hot stove, you can smell how stupid you are ...

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Bryce

#15
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.

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