Videomaster - Revision history

Arnoldemu at 13:37, 26 February 2018

2018-02-26T13:37:49Z

Arnoldemu: /* Technical */

2017-09-17T14:58:53Z

‎Technical

Arnoldemu: /* Technical */

2017-09-17T14:58:40Z

‎Technical

Arnoldemu: /* Quality */

2017-09-17T14:58:19Z

‎Quality

Arnoldemu: /* Pictures */

2017-09-09T12:36:20Z

‎Pictures

Arnoldemu: /* Pictures */

2017-09-09T12:29:30Z

‎Pictures

Arnoldemu: /* Quality */

2017-09-09T10:30:25Z

‎Quality

Arnoldemu: /* Technical */

2017-09-09T10:28:26Z

‎Technical

Arnoldemu: /* Quality */

2017-09-03T16:26:18Z

‎Quality

Arnoldemu: /* Quality */

2017-09-03T16:20:41Z

‎Quality

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← Older revision		Revision as of 13:37, 26 February 2018
Line 10:		Line 10:

	Made by [[Campursoft\|Campursoft]]		Made by [[Campursoft\|Campursoft]]
		+	Designed by Steve Hammond.

	== Quality ==		== Quality ==

@@ Line 44: / Line 44: @@
   IC1 TEA2000 (PAL/NTSC Colour Encoder supporting 64 colours)
   RV1 variable resistor - turning this controls brightness
-  VC1 variable resistor - turning this controls colour (too far to the left or right and you get black/white, when colour appears, turning it can result in
+  VC1 variable resistor - turning this controls colour (too far to the left or right and you get black/white, when colour appears, turning it can result in colour movement in one direction, then stable and then in the other direction).
 colour movement in one direction, then stable and then in the other direction).
    L1 variable resistor - unknown operation. it doesn't seem to do anything.

@@ Line 46: / Line 46: @@
   VC1 variable resistor - turning this controls colour (too far to the left or right and you get black/white, when colour appears, turning it can result in
 colour movement in one direction, then stable and then in the other direction).
-   L1 variable resistor
+   L1 variable resistor - unknown operation. it doesn't seem to do anything.
 == Pictures ==

← Older revision		Revision as of 14:58, 17 September 2017
Line 28:		Line 28:

	With a composite cable the image quality is a little bit better than with the SCART cable but still some ghosting remains. Turning RV1 or VC1 doesn't remove it. However turning VC1 stops the multicolours moving through the text and it becomes much more readable. In mode 2, bright white on black is readable and useable. The colours less than 13 however are difficult to read.		With a composite cable the image quality is a little bit better than with the SCART cable but still some ghosting remains. Turning RV1 or VC1 doesn't remove it. However turning VC1 stops the multicolours moving through the text and it becomes much more readable. In mode 2, bright white on black is readable and useable. The colours less than 13 however are difficult to read.
		+
		+	Turning L1 doesn't seem to do anything.

	NOTE:		NOTE:

← Older revision		Revision as of 12:36, 9 September 2017
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	[[image:VideoMasterComposite.JPG\|none\|left\|thumb\|200px\|Output on a Sony Trinitron 14" CRT television]]		[[image:VideoMasterComposite.JPG\|none\|left\|thumb\|200px\|Output on a Sony Trinitron 14" CRT television]]
		+	[[image:VideoMasterColours.jpg\|none\|left\|thumb\|200px\|Mode 0, Inks 10-25 on a Sony Trinitron 14" CRT television]]

	== User Manual ==		== User Manual ==

← Older revision		Revision as of 12:29, 9 September 2017
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	[[image:Vm-h3.jpg\|none\|left\|thumb\|200px\|SCART cable of VideoMaster]]		[[image:Vm-h3.jpg\|none\|left\|thumb\|200px\|SCART cable of VideoMaster]]
		+
		+	[[image:VideoMasterComposite.JPG\|none\|left\|thumb\|200px\|Output on a Sony Trinitron 14" CRT television]]

	== User Manual ==		== User Manual ==

@@ Line 26: / Line 26: @@
 On a Sony Trinitron 14" CRT television the image is much much better. There is much less ghosting and the image is brighter. Mode 0 is good, mode 1 is fine and mode 2 is readable depending on the colour choices. If I set mode 2, set the background to black and the text to bright white I see multicolours moving through the text but it is still readable. The trinitron television accepts shorter hsync lengths, but at 4, the image changes colour with the Videomaster. Restoring the hsync length doesn't work, it remains at the changed colour and I need to power the computer on/off to get the colours back. For some inks the text appears thinner, for other inks it appears fatter. In terms of image quality with colours, green is best, then red then blue.
 NOTE:
@@ Line 32: / Line 34: @@
 * I am still investigating how to get a better picture out of the Videomaster because I still believe it's possible.
 * Unfortunately I am unable to compare this with Amstrad's modulator which it claims to be superior to.
-−
-* The video master has adjustable variable resistors which may improve the picture and using a composite cable is likely to improve it too.
 == Technical ==

@@ Line 17: / Line 17: @@
 On a modern flat screen LCD television the image quality from the Videomaster is worse than the SCART cables you can buy and worse than a native green screen or colour monitor. (This is using a composite to SCART cable).
-Mode 0 is fine, mode 1 is useable, but mode 2 is hard to read. This is down to ghosting in the image. With the yellow on blue the ghosting is black. I (arnoldemu) have seen similar when using the SCART output from a KC Compact on a television so it may be that the signals are not acceptable to the modern TV.
+Mode 0 is fine, mode 1 is useable, but mode 2 is hard to read. This is down to ghosting in the image. With the yellow on blue the ghosting is black. I (arnoldemu) have seen similar when using the SCART output from a KC Compact on a television. I believe the modern televisions are much less tolerant, so it may be that the signals are not acceptable to the modern TV.
 The colour reproduction is good although bright white is a little dull for me. My television also has trouble with bright green in that there is visible moving dot crawl around the edges. There is also some noticeable banding between main display and border when the border colour is different from the main area.
@@ Line 23: / Line 23: @@
 Like the SCART, register 3 scrolling can be used (use values 5/6 for hsync length - any lower and the picture loses sync), and like the SCART if you try to use lower hsync lengths and if the border is not black then the main display will become darker.
-It has also happened that when the television looses sync and when you then re-sync the picture is black and white with noticeable dot crawl all over it. I don't see this with a SCART cable.
+It has also happened that when I program the sync so that the television can't accept it and then re-program it back to the default the picture is black and white with noticeable dot crawl all over it. I don't see this with a SCART cable.
-I believe the problems I am seeing are down to the higher R,G,B voltage output from the Videomaster and using a composite to SCART.
+On a Sony Trinitron 14" CRT television the image is much much better. There is much less ghosting and the image is brighter. Mode 0 is good, mode 1 is fine and mode 2 is readable depending on the colour choices. If I set mode 2, set the background to black and the text to bright white I see multicolours moving through the text but it is still readable. The trinitron television accepts shorter hsync lengths, but at 4, the image changes colour with the Videomaster. Restoring the hsync length doesn't work, it remains at the changed colour and I need to power the computer on/off to get the colours back. For some inks the text appears thinner, for other inks it appears fatter. In terms of image quality with colours, green is best, then red then blue.
-Unfortunately I am unable to compare this with Amstrad's modulator.
+NOTE:
-On a Sony Trinitron 14" CRT television the image is much better. There is much less ghosting and the image is brighter. Mode 2 is still hard to read, mode 1 is fine, mode 0 is fine. If I set mode 2, set the background to black and the text to bright white I see multicolours moving through the text but it's readable. The television accepts shorter hsync lengths, but at 4, the image changes colour. Restoring the hsync length doesn't work and I need to power the computer on/off. For some inks the text appears thinner, for other inks it appears fatter. In terms of image quality with colours, green is best, then red then blue.
+* I am still investigating how to get a better picture out of the Videomaster because I still believe it's possible.
-NOTE: The video master has adjustable variable resistors which may improve this and using a correct composite cable is likely to improve it too. I will get some more technical help and update this.
+* Unfortunately I am unable to compare this with Amstrad's modulator which it claims to be superior to.
 == Technical ==