240p test suite equivalent for zx spectrum
- fenderjaguar
- Drutt
- Posts: 23
- Joined: Wed Mar 07, 2018 11:48 am
240p test suite equivalent for zx spectrum
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
- Rick Dangerous
- Posts: 2641
- Joined: Mon Nov 13, 2017 3:16 pm
Re: 240p test suite equivalent for zx spectrum
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.
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.
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
- fenderjaguar
- Drutt
- Posts: 23
- Joined: Wed Mar 07, 2018 11:48 am
Re: 240p test suite equivalent for zx spectrum
all these years of owning this computer, and I never knew about it! Thanks.Ast A. Moore wrote: ↑Mon Feb 11, 2019 2:32 pmFor 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
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
- Rick Dangerous
- Posts: 2641
- Joined: Mon Nov 13, 2017 3:16 pm
Re: 240p test suite equivalent for zx spectrum
Try something along the lines of:fenderjaguar wrote: ↑Mon Feb 11, 2019 2:51 pm I don't know the commands to draw a circle and border in +3 basic
Code: Select all
10 BORDER 0
20 CIRCLE 127,88,86
Every man should plant a tree, build a house, and write a ZX Spectrum game.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.
Author of A Yankee in Iraq, a 50 fps shoot-’em-up—the first game to utilize the floating bus on the +2A/+3,
and zasm Z80 Assembler syntax highlighter.