Sinclair ZX80 / ZX81 / Z88 Forums

If it helps, the arcade game it's based on is Astro Invader.

https://www.youtube.com/watch?v=3UcmU0qV5U8

Hi JohnsBargs, I'm in the middle of writing a 1k version which I need to get back into. I've run out of memory so progress is slow. Only a couple of features to add before it can be released.

Depending on how good rnd is, you could loop thro each element and swap it with a random element. Sometimes an element might get swapped with itself and sometimes an element can get swapped multiple times but not sure if this would be a problem.

Hi Andrew,

I too like to write games for the zx81 in 1K. Recently I released QDepthcharge and currently working on QAstro Invaders (the Q stands for quarter screen).

See the "New ZX81 Games" thread too for some amazing games.

Paul

Another week and another update.

I've got firing working, except for hitting saucers and invaders crashing into the ground.

Slow progress I know but still got 100 bytes or so left to handle the remaining bits like losing a life and the game.

A quick update. I've added the saucer and a couple of bugs.

Lots still to do including firing and losing a life.

Does the book have type-ins of the games in funky slanted columns?

JohnsBargs wrote: ↑Tue Apr 25, 2023 6:13 pm

thewiz wrote: ↑Thu Apr 13, 2023 1:48 pm Name of Software: QDepthCharge
Author: Paul Daniels

I like that - quite a lot

Thanks JohnsBargs, glad you enjoyed it.

Here's another update. Got the invaders moving and another screenshot. Phase2.png The game is Astro Invaders, which for some reason I remember from BITD. I thought it would work well in 1k so why not. Yes, I'm using your 1K optimization dr beep to wring the most out of the zeddy. Still got 400 bytes...

Hi All,

I've started another 1K game and thought I post my progress as I go. No idea if it will work or if it will turn out the way I imagine it will.

Any guesses on the game?