Aaron the Aant

[+atari2600land]

This game was originally made for the Odyssey 2 by me. I just wondered if I could do the same thing in batariBASIC on the VCS and still have it be 2k. This is what I have so far.

 

aaronaatari1.bas.bin

[+atari2600land]

I'm trying to make the ant not walk when the joystick is standing still. I tried using SWCHA for joystick reading to do this:

    q = SWCHA / 16

    if q>0 then o=o+1

where if o{2}=1 a frame is on and o{2}=0 a different frame is on, but it didn't work. Why not, and what would work?

 

aaronaatari2.bas

[+atari2600land]

I figured it out. Looking at the code from Larry the Lemon, the line that used SWCHA was this:

q = SWCHA / 16 ^ $0F

I don't know what the ^ $0F part means (I do know that $0F = 16), but I plopped that in and it works okay. Perhaps RT should edit his page to include the "^ $0F" part?

Another weird thing is when I compile, I have 111 bytes left. So then I went to put in something that couldn't possibly be 111 bytes and it ends up as -23 bytes. What's going on there?

Anyway, here's the latest build.

 

aaronaatari3.zip

[ZackAttack]

$0F is actually 15 decimal and 00001111 binary. I think ^ is the XOR operator. If so ^ $0F would invert the 4 bits on the right. (1's become 0's and vice versa)

[+atari2600land]

OK, so $10 is actually 16 then. I knew that.

[chavert]

fun game. thanks

[Erik Zimmermann]

WOW. Very nice game for weekend

[+ZeroPage Homebrew]

ZeroPage Homebrew is playing Aaron the Aant on tomorrow's stream LIVE on Twitch, hope you can join us!

 

Tue May 3 @ 6PM PT | 9PM ET | 1AM GMT+1Day

WATCH: https://www.twitch.tv/zeropagehomebrew/

Games:

• Wet Paint (2017 WIP | 2600) by uosipa llamxew @uosipa llamxew
• Aaron the Aant (2015 WIP | 2600) by Chris Read @atari2600land
• Donkey Kong 3 (2017 WIP | 2600) by Chris Read @atari2600land / ILA2600 @ILA2600
• Stranglehand (2013 | 2600) by Jason Santuci @Gemintronic

After Dark:

• INV+ (2004 for The 2600 High Score Showdown S6 | 2600) by Erik Mooney and Piero Cavina