Sinclair ZX80 / ZX81 / Z88 Forums

Hi all. Thanks for all the kind comments. 1k MazezaM won in the 1k category of this year's (unofficial) Minigame competition :D http://minigamecompo2010.00freehost.com/ I suspect this is the first time a ZX81 game has had the honour, although the old minigame page is gone so I can't check that for s...

Shaun_B wrote:Lisa has nearly finished this amazing 1K game - I think she loves and hates it in equal doses.

Regards,

Shaun.

Wow! It's great to hear that someone is enjoying (and frustrated by) my game!

Malx

> This is another bit of software which I have missed - can I add it to the ZX81 software page at:
> http://www.rwapsoftware.co.uk/zx81/zx81_software.html

Absolutely! Please do

Malx

Firstly, great game and impressive coding! BTW, if anyone tries dropping those bytes from the basic program, you need to adjust the target address. Thus, you should replace the 30 by 26, giving: AUTO .DW 0 ; Line number (MSB) .DW USREND - USRBEG ; Line length USRBEG .DB $f5, $d4, ; PRINT USR .DB $1c...

I see from other posts on this forum that key layout is important to many ZX81ers. Here's a version supporting QAOP and 5678 (I used the extra space I mentioned above to support them both).

Malcolm

> what I did was make each game object have a copy of the (static) data that would normally be found in the sysvars.

Very nice!

> Not useful for a 1K game, I know

Yep, it's far too elegant for 1k programming

Malcolm

> What's the IY trick? The following is a guess from looking at the qfrogger code. There are several Z80 instructions which operate on the address (IY + index), where index represents a value from -127 to 128 (I think). However, as we know you can't safely change IY during user code (except when you...

> "What can I do with 1K? " Well, I certainly enjoyed the challenge, but it looks like I missed several tricks. I've just taken a look at the source of the very impressive qfrogger and found the following things I could have tried: 1. Better way of putting the code in a basic program (This immediate...

Thanks for testing it sirmorris.

BTW, if you get stuck on a particular level, you can skip it by pressing "S". (Believe it or not, I still get stuck on some of my own levels!!!)

Malcolm

Sorry about that: "iturbez" not "itubez". Thanks again for your comments

Malcolm