• Bruce

Variables Reference - Shmupkit

Here's a full list of the Global Variables used by Shmupkit, I've tried to leave as many as possible free for you own use in your games.


VARIABLES USED BY SHMUPKIT
==========================

A -         available for use in your code
B -         available for use in your code
C - ENEMY COLOUR
D - KILLS TO GET BONUS
E - # ENEMIES IN WAVE
F - ENEMIES LEFT
G - ENEMY RELEASE DELAY
H - ENEMY WEAPON FIRE PROBABILITY
I - X DISTANCE FOR ENEMY WEAPON TRIGGERING
J - ENEMY SPRITE TYPE
K - ENEMY IMAGE
L - LEVEL/WAVE
M - PLAYER X FOR USE IN OTHER EVENTS
N - PLAYER Y FOR USE IN OTHER EVENTS
O -        available for use in your code
P - POINTS FOR A KILL
Q - HEIGHT FOR ALIEN WEAPON RELEASE
R -         available for use in your code
S - SPRITE COUNTER
T - TRIGGER
U -         available for use in your code
V -         available for use in your code
W - ENEMY WEAPON
Z - MUSIC (reserved)

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A simple GAME OVER message, similar to the GET READY one in the Restart Screen Event: EVENT LOSTGAME AT 10 12 REPEAT 10 READ A CHR A DELAY 5 ENDREPEAT DELAY 100 DATA 'G' 'A' 'M' 'E' ' ' 'O' 'V' 'E

What happens when a player is killed?, we decrement their lives and update the lives counter on screen EVENT KILLPLAYER SUBTRACT 1 FROM LIVES ; reduce number of lives remaining AT 0 16 ; upda

This event runs whenever the game first starts or restarts after the player is killed. The important thing here is that we need to reset the Sprite Counter (S) to 0, our Initialise Sprite event will

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aboutME

Hello, I'm Bruce and I write games for old 8bit computers using Jonathan Cauldwell's excellent Multi-Platform Arcade Games Designer (MPAGD)

I've written a few successful* games for the Sinclair ZX Spectrum and MSX platforms that have been (largely) well received including Twenty Four Hour Parsley People scoring a 10 out of 10 on Planeta Sinclair.

In my blog I am sharing lots of the code that I wrote for my games, in a way that you can use in your own games.   I've commented it so that you'll learn some of the techniques I use to create interesting new mechanics and help your games stand out from the pack.

MPAGD includes lots of standard scripts, they're great to get you started, but if you're new (or just rusty) when it comes to writing code, hopefully my tutorials will help you get started and  turn your imagination into awesome 8 bit games!

All my code is free to use and do with as you please, but if you find them useful please feel free to buy me a coffee ...or better still - buy or download my games :)

*successful is a very relative term in 8bit computer games