QS Invaders from Quicksilva

[David G]

A nice Space Invaders clone from Quicksilva written by Dave Edwards

QS Invaders ZX81

* Automatically detects if you have a Quicksilva QS Sound Board and makes very nice Space Invader sounds
* Automatically detects if you have a Quicksilva QS CHRS Board

with QS CHRS Board

This also works with EightyOne: On the Hardware menu. select Chr$ Generator: Quicksilva, then on the Control menu tap "Enable Quicksilva character board"

CONTROLS: Left - Right - Fire
I was a bit confused by this. Does it require a joystick? No random amount of key smashing could get anything to happen. Then I read the extra card in the cassette containing TABLE A, where it lists 6=SHIFT LEFT, 7=SHIFT RIGHT, 0=FIRE. Which is odd because those are the UP ARROW and DOWN ARROW keys

The program is a hybrid, with machine code for smooth gameplay, and BASIC for menus and configuration. The BASIC part makes POKEs to configure the M/C. As a plus, this means you can POKE many things such as speed and controls

The BASIC has these lines:

Code: Select all

1 REM *** SPACE  INVADERS ***
2 REM *** BY DAVE EDWARDS ***

[stroebeljc]

Running on EO eventually results in a blank screen, even though the sounds continue. Has anyone else experienced this? Does this happen on real hardware? (I haven't had a chance to try it yet.)