MEGA-DRIVE

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by Peter Fothergill

from ZX Computing, May 1986



Mega-Drive is a machine code arcade game for the Spectrum (all versions), in

which all you have to do is blast the enemy ships before they blast you! Your

force field can take nine hits before it's destroyed. Controls are Z/X =

left/right and Symbol Shift = fire.



Listing 1

This is the loader program for entering the machine code. Type it in and RUN

it, and enter the m/c from Listing 2.



Listing 2

The numbers in the left-hand column are the memory addresses for the code —

don’t type these in, just type in the numbers in the second column onwards,

typing ENTER after each one. There is a check built into Listing 1, so if

you’ve made a mistake it will tell you. If this happens delete listing 1 line

by line (don’t type NEW) and enter Listing 3.



Listing 3

This will print out all the machine code that you’ve typed in and allow you

to compare it with the data in ListIng 2 in order to locate your mistake.

Correct errors with the command POKE address, correct number.



Listing 4

This is the loader for the finished game. Once you’ve corrected all the

errors type this in and enter as a direct command the following statement;

SAVE "MEGADRIVE" LINE 1: SAVE "MEGACODE" CODE 25000,2511 then follow the

prompts to save the game onto a blank cassette. To run the game without

loading it in from tape again, use: RANDOMIZE USR 25000.