Hi All,
I am looking to create a cable to connect a scart device to my CTM644 Monitor, something like this
Monitor (6 Pin female) ---> Scart Plug (female)
Is there any wiring diagrams anywhere? ;)
Thanks
B
Is this what you're looking for? (http://www.cpcmania.com/Docs/TDT/TDT.htm)
That's good but I could do with it a little simpler :(
Ctm 644 -- Scart head
Pin. Scart pin
1. --------> ?
2. --------> ?
3. --------> ?
4. --------> ?
5. --------> ?
6. --------> ?
Like this
Ctm 644 -- Scart head
Pin. Scart pin
1. --------> 15
2. --------> 11
3. --------> 7
4. --------> 20
5. --------> 5, 9, 13, 17
6. --------> Not Connected
Bryce.
GREAT!!
Thanks buddy ;D
How about to Amiga
Ctm 644 -- Amiga
Pin. pin
1. --------> ?
2. --------> ?
3. --------> ?
4. --------> ?
5. --------> ?
6. --------> ?
(http://img543.imageshack.us/img543/1290/picture4oe.png) (http://imageshack.us/photo/my-images/543/picture4oe.png/)
I think I got it using the last diagram, does this look correct?
Ctm 644 -- Amiga
Pin. pin
1. --------> 3
2. --------> 4
3. --------> 5
4. --------> 10
5. --------> 16
6. --------> Not used
Correct although I think I connected all of the pins 16 to 20 of the Amiga to pin 5 of the CTM. The Amiga gives a great picture on the CTM by the way :)
Bryce.
I know, when I was a kid I couldn't afford an Amiga monitor so i used the same setup ;D
Now just the Atari ST to do & thats the lot :D
I think I found it, does this look right?
Ctm 644 -- ST
Pin. pin
1. --------> 7
2. --------> 6
3. --------> 10
4. --------> 1
5. --------> 13
6. --------> Not used
(http://img850.imageshack.us/img850/4627/picture6dln.png) (http://imageshack.us/photo/my-images/850/picture6dln.png/)
(http://www.cpcwiki.eu/forum/file:///Users/briashall/Library/Caches/TemporaryItems/moz-screenshot.png)(http://www.cpcwiki.eu/forum/file:///Users/briashall/Library/Caches/TemporaryItems/moz-screenshot-1.png)
Eh, I think I'd connect the Sync (Pin 2) to the CTM instead of Sound Out (Pin 1) :)
Bryce.
I used to use my GT65 Monitor with my Atari ST, it worked but the V-HOLD used to go a little screwy. It was spookily like looking at a CPC on some programs lending some credibility to some peoples' opinion that the CPC is the Atari ST 8 bit counterpart! Just trying to think of some examples, erm, Prince of Persia (a little more high res looking but very similar), Out Run, and one of the Star Wars games, you know, the isometric one.
Wired up Amiga, fine
Wired up scart and the pic is really bright but all the colours are correct?
Any ideas?
That depends on the device at the other end of the SCART cable, that's possibly producing too high a voltage on the RGB signals. Try a different device. If all SCART devices are too bright, you can add resistors to the colour lines to lower the brightness.
Bryce.
I tried using the resisters & it works a charm THANKS!!
Its just a shame its only a 50hz monitor & not a 60hz one but hey....
Thanks!
Bit puzzled now....
I hooked it my amiga 500+ (pic looks fine)
Used the same adapter & hooked up my amiga 1200 (green screen?)
Checked the wiring loom I made, no wires have come off etc.
Tested the 500+ & the 1200 via scart on a TV both displayed fine?
Wonder why its a green on the CTM?
Are you sure you didn't accidentally connect it to your GT65 :D
But seriously... The A500 uses a low frequency video signal, but the A1200 has an AGA Video Chip, that runs at a higher frequency. The frequency is probably too high for the CTM, but not for the TV.
Bryce.
So I can't use it on the CTM :'(
It might work in some video modes, but I wouldn't recommend it. The pixel clock is probably too fast for the CTMs transistors and may damage the CTM because they are probably getting very hot.
Bryce.
Oh well, thanks for the heads up buddy ;D
just a question...
Were those Amstrad CPC/PLUS monitors supposed to be cheap and bad TV or were they actually good TV but cheaper because of Amstrad method and having no TV-Tuner ?
QuoteWired up scart and the pic is really bright but all the colours are correct?
can't you simply turn down the brightness potentiometer ? ;D
The CM, CTM and GT Monitors are actually rather good quality, and they used high quality components in them, but the design is optomised to the extreme, so that the price is as low as possible. The fact that so many working monitors still exist should really speak for itself, no? The only thing I think they "over optomised" were the variable resistors (Brightness and V-hold). They are really cheap caseless parts, which is why they tend to be very hit-and-miss after even a few months from the dirt that collects on them.
Bryce.
Right, especially cigarette smoke is killing them. However smoking in the same area in which a CPC is located is a NO GO anyway ;)
Can you adjust the Height & Width of the screen on ths monitor at all?
The signal from the computer determines the height and width, not the monitor.
Bryce.
Quote from: Beaps on 00:15, 19 June 12
Can you adjust the Height & Width of the screen on ths monitor at all?
Yes, you can, and I did that for some monitors. You find the needed potentiometers inside the monitor, so you have to unscrew it and get the plastic shell off (temporary). I once did that to adjust a monitor in a way that a circle in mode 2 is really as high as wide.
Turning those potentiometers too far can badly damage or seriously shorten the life of the monitor. I wouldn't advise it, if you are not 100% sure of what you are doing.
Bryce.
They wouldn't have included it, if there wouldn't be sense for them. Else they could have just used resistors with one constant value. And as we know Amstrad did things always with having low cost in mind. I saw no problems using them. But hey, sure, you can overdo everything ;)
EDIT: More expansive monitors have the same potentiometers outside.
I looked on the monitor mobo, I couldn't see any pots to turn for hight/width.
It's a shame they didn't include this feature as the borders are rediculas
Hmm, my CTM644 has that stuff and also my Plus monitor.
@Beaps: They are definitely there, usually on the PCB that's plugged onto the tube.
@TFM: Yes they are definitely there for a reason, but not that reason that you suggest. They are there because the entire circuit is analogue and every component has tolerences. You have to have variable components to tune the circuit. No two analogue circuits work identically, the variable resistors are there to make them at least similar.
Bryce.
I would think the width is pre-set, but I used to adjust the height by placing big books under it.
The width (screen to border ratio) is determined by the signal sent from the CPC, but you can widen the screen part by adjusting the monitor to scan wider than the physical screen, you are just hiding more of the border off-screen. The scan voltage is produced by an analogue circuit, so it can vary quite a bit, the variable resistor is there to tune the voltage to the screen size. If you raise this too much, you could overload the deflection coil or other parts that aren't spec'ed to take such a high voltage.
Bryce.
Well, I got a similar monitor - I mean similar to the CTM644, but it's more like a kind of multisync monitor. That one has the same potentiometers outside, which the CTM644 has inside.
These "inside" potentiomers of the CTM644 (IIRC) are NOT the small ones used for justification of things on the PCB, they are indeed bigger. Therefore I was able to find them ;)
However, it really doesn't matter.