Sinclair ZX80 / ZX81 / Z88 Forums

sirmorris wrote: ↑Sun Sep 10, 2017 6:59 pm Also,

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L0237:  LD      B,(HL)          ; (7) Note. Harmless Nonsensical Timing weight.

Is exactly it

So the fix should be LD H, (HL)

* Yes, the ZX81 appears to have a pet - a restless red 'ant' (escaped from the classic game?) which relentlessly patrols RAM from the end to the start. It's (most likely) a read instruction in the display routine. I've fleetingly looked into the emulation but I suspect it's a genuine access by the ...

The entire developmentstory: Breakout, the development story. Introduction: After coding AIRPIPES Shaun Bebbers mentioned BREAKOUT. I had been thinking about this long time ago. With the technic used on K-Bird it could be possible. The screen: As in all games the screen is the first to display the c...

I altered the display of data in my latest game to show you how much "screen" actually is stored in 1K.

Have fun watching this video.

https://youtu.be/Ih8hACdN7yM

I was trying to find room for the hires routine. I would need 27 bytes for this. I found 13 bytes. Then it hit me. The display of top and bottom line is an inverted linebuffer with data from the linebuffer of the ball. This is how the program is and already saved 29 bytes. The stack used to display ...

I like it, thanks Dr! I imagine that ~200 t-states isn't a lot, so good work. So far not got past level two though. Regards, Shaun 207 tstates per line. Display of 240 pixels is already 120 tstates, rest is used for other code. Some lines need over 130 tstates for other code. This is partly done ov...

Name of Software: Break Out Author: Johan "Dr Beep" Koelman Release Date: 04/09/2017 Requirements (eg. 1K, 16K, AY Card, Hi-Res Scheme): 1K, WRX hires Description: a REAL break-out in 1K hires Breakout-fs.png Download link (if available for download): breakout.p FINAL FINAL VERSION WITH HISCORE AND ...

So I had to give up some things... Not in the game: Display of the name of the game Hiscore tracking I was however able to: Add the 6 levels completed check repair the BAT-bug Fit the game in EXACTLY 1K The stack is at its MINIMUM. 1 byte more and code gets corrupted and game crashes. Official relea...

Getting somewhere.

a small bug on the bat.
no scoring yet

Q=up
A=down

NL=start game

Space= release ball

Still 68 bytes left.

To do:
score after brickhit
end of level
end of game
hiscore test

fingers crossed