240p test suite equivalent for zx spectrum

[fenderjaguar]

say I want to adjust some settings on my Trinitron CRT, is there a decent test pattern program on the Spectrum for doing that?

[Ast A. Moore]

For geometry adjustments, I usually draw a circle in BASIC and set the border to black. For colors, if you’re on a 128K machine, you can just power it on while holding the BREAK key. This will bring up a color bar test screen. You can easily reproduce it (or create a similar pattern) in BASIC on a 48K Spectrum.

The rest should be handled on a case by case basis. For example, you could set the border and paper to black and use some bright white text to set up your contrast and brightness levels so that it doesn’t produce horizontal streaking.

[fenderjaguar]

For colors, if you’re on a 128K machine, you can just power it on while holding the BREAK key. This will bring up a color bar test screen

all these years of owning this computer, and I never knew about it! Thanks.

I don't know the commands to draw a circle and border in +3 basic, but I'll read the +3 manual, I'm sure it's in there somewhere

[Ast A. Moore]

I don't know the commands to draw a circle and border in +3 basic

Try something along the lines of:

Code: Select all

10 BORDER 0
20 CIRCLE 127,88,86

It breaks down like this: CIRCLE x-coord,y-coord,radius