Sinclair ZX80 / ZX81 / Z88 Forums

Honestly,

I think you should code in assembly.
On the ZX81 BASIC is tediously slow.

Name of Software: Arma-K-don Author: Johan "Dr Beep" Koelman Release Date: 18/04/2025 Requirements (eg. 1K, 16K, AY Card, Hi-Res Scheme): 1K lowres Commercial / Public Domain / Free ware / Other - please specify? Freeware Description: Shoot the incominbg missiles to protect the bases Armakdon.png Do...

I think I see your mistake.

You have BC #420, make it #401

I don’t think you can have it so close, but something like this?

I don’t know what you mean. You do a hires display and then a lowres. There is no vertical allignment.

LD A,#FB decrease if you want lowres text to right, increase if text must go left

I have done it in my games too, but I mostly place lowres text on top now.

you are displaying single udg not double sized so only 1 position is enough to display.

Since you are displaying the full board and also the empty fields you can als simply place a full new board without erasing.

this will take away the flashing and give right result.

I do that in my 1K game Shogun.

The flickering is because you erase the entire board. Since this is chess you better only move the piece you selected. A piece can hit a new piece so you better alter the display and skip the XOR (HL) and only place the piece LD A,(DE) LD (HL),A This also needs an erasing UDG into an empty field bla...

The 1K hires routines are optimized for the 1K use and therefore harder to read than the normal 16K WRX from Wilf Rigter. I know how all 1K grew over the years and some routines are really tight in code and therefore hard to read. A game like BREAKOUT has by heart 7 paths in the display all to fit i...