Denial

Kweepa · Posted: Sun Jun 17, 2012 6:01 pm Post subject: New Release: KWEEPOUT

http://www.kweepa.com/step/vic20/games/kweepout.prg

A version of Breakout (oops!) written in BASIC for the unexpanded VIC.
This was an experiment to see how much I could fit into a BASIC program.
Loosely inspired by this presentation:
http://www.youtube.com/watch?v=Fy0aCDmgnxg
Let me know what you think!

TBCVIC · Posted: Mon Jun 18, 2012 2:30 am Post subject:

Very nice! Though that's not Pong, that's Breakout.
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Kweepa · Posted: Mon Jun 18, 2012 8:00 am Post subject:

Mayhem · Posted: Mon Jun 18, 2012 9:48 am Post subject:

Kweepout sounds a bit wrong though Wink

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Jeff-20 · Posted: Mon Jun 18, 2012 10:32 am Post subject:

tokra · Posted: Mon Jun 18, 2012 6:05 pm Post subject:

Nice one! Always pleasantly surprised by your versatility! Action (Doom), Text Adventure (Cometfall), Jump & Run (Blue Star) and now you even rival the Jeff's BASIC skills!

I managed to finish level one but in level two the screen started going crazy. The blanks in the background were replaced with another char, and after a few minutes even the ball was gone. Probably string-variables creeping into the character definitions (since those are written from the top down). Looks like you did not protect your character-definition by something like

Kweepa · Posted: Mon Jun 18, 2012 6:26 pm Post subject:

Gah!
I deliberately didn't do that, because I needed all the space below for the program and variables.
I'm only using one string variable, A$, and during gameplay it's only used to hold the score, so I'm not sure how it keeps growing... Any ideas? There should be 248 bytes free between the space character and the screen.

GreyGhost · Posted: Mon Jun 18, 2012 7:20 pm Post subject:

Could you use some of that free space to save the score there. Then read it like you would a low byte - high byte. I haven't played the game yet so I'm not sure how high the score can go, but 3 bytes can hold a number over 15 million.

score = peek(byte 1)+peek(byte 2)*256+peek(byte 3)*65536

Of course it will take a bit of memory to calculate.

if byte 1>256 then byte 2 = byte 2 + 1
if byte 2 >256 then byte 3 = byte 3 + 1
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Rob

Ghislain · Posted: Tue Jun 19, 2012 12:49 am Post subject:

I really should get an sd2iec device so I can try these new games that are coming out. A couple of years ago I made it a point to transfer all of the 'New Releases' via USB to 1541 cable. Emulation is fine, but when you have a real hardware setup, you tend to just want to actually play the games on real hardware.

So I'm going to order an sd2iec device right now. Maybe a second one for my C64 as well. I'm sort of tired of always trying to keep track of what game or program is on which disk, etc.
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matsondawson · Posted: Tue Jun 19, 2012 1:49 am Post subject:

tokra · Posted: Tue Jun 19, 2012 2:49 am Post subject:

GreyGhost · Posted: Tue Jun 19, 2012 6:06 am Post subject:

Also, if you change:

Kweepa · Posted: Tue Jun 19, 2012 7:36 am Post subject:

Thanks for the detailed analysis!
I had no idea there was lazy garbage collection! You (I) live and learn!
Including the character set definitely goes against my "true" agenda which is a single, type-in-able, file.
For setting the sound and border, unless I'm miscounting, using a loop and data statement (which I combined with existing data) takes 4 bytes less than 6 pokes.
I tried moving the character set further up in memory but without the FRE(0) the definitions got massacred instantly. I know how to fix it now though Smile

THENGOTO? Oops! Amateur hour!
I'll knock up a new version soon.

Oh, and for the emulated version, I realize now that I'm using the space character undefined, so it's liable to end up garbage. In VICE it seemed to be ok.

Jeff-20 · Posted: Tue Jun 19, 2012 9:08 am Post subject:

GreyGhost · Posted: Tue Jun 19, 2012 1:35 pm Post subject: