This is a simple colour-picker that shows all 255 colours in a fancy gradient shade. You can use CURSOR KEYS to move the asterisk around and report the hue, the code in HEX, Decimal and Binary
Should be available here above "Ch17-layer2-5.bas".
This is CHR$ Editor published on the book "Spectrum Tools". I improved it this way: it is possible to change the address pointer to UDG, so you can design anything you like ...Â
I've found experimentally on real ZX Spectrum and on emulator that Ron Seniscal's SYS64 (for 48K) doesn't work with ZX Interface1 fitted in.
Somehow it hangs. Examining the code of the interrupt routine I noticed that the addresses of channels are static instead of being determined using CHANS system variable. This way, the ROM of Interface1 remains active during the interrupt and the Spectrum HALTs waiting a keypressed that will never come.
I've modified the code so it works with or without Interface 1.