Made by [[Campursoft|Campursoft]]
Designed by Steve Hammond.
== Quality ==
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 . 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.
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 I program the television looses sync so that the television can't accept it and when you then re-sync 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 On a Sony Trinitron 14" CRT television the problems 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 am seeing are down set mode 2, set the background to black and the higher Rtext to bright white I see multicolours moving through the text but it is still readable. The trinitron television accepts shorter hsync lengths,Gbut at 4,B voltage output from the image changes colour with the Videomaster . Restoring the hsync length doesn't work, it remains at the changed colour and using a composite I need to SCARTpower 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 a composite cable the image quality is a little bit better than with Amstradthe SCART cable but still some ghosting remains. Turning RV1 or VC1 doesn's modulatort 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.
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 Turning L1 doesn't work and I need seem 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 bluedo anything.
NOTE: The video master has adjustable variable resistors which may improve this and using a correct composite cable is likely * I don't have other CRTs or flatscreens to improve compare it tooon, so I may have been unlucky. * I will am still investigating how to get some more technical help and update a better picture out of the Videomaster because I still believe it's possible. * Unfortunately I am unable to compare thiswith Amstrad's modulator which it claims to be superior to.
== Technical ==
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 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.
== Pictures ==
[[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]]
[[image:VideoMasterColours.jpg|none|left|thumb|200px|Mode 0, Inks 10-25 on a Sony Trinitron 14" CRT television]]
== User Manual ==