biggoil

Fast action game for 16K ZX81.

Pure machine code action FTW.

• Collect the oil from the underground tunnels.
• Do not let the enemies touch the pipe that you pull along behind you.
• Enemies self-destruct upon contact with the drill head.

Default controls:

UDLR / FIRE
QAOP / SPACE

Redefine keys on title screen.

DOWNLOAD

Enhanced features:

• Music and sound effects.
  • ZonX compatible AY chip is required, E.G. Mr.X, ZXpand+, ZXPand+AY
• Joystick control
  • ZXpand+, ZXpand+AY standard.

All game and artifact handling code by Sir Morris Bigg.
STC music player by Andy Rea.

Sketchy

AYFXEdit

BRASS

Archived development log

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bugs:

• pipe turns are broken after retracting
• enemies crossing leave an enemy character behind
• 'hello' sound too loud
• invalid entrances can be selected
• enemies erase non-solid inverse characters

engine

• rom dependency removal via custom irq handler
• non-interruptable SFX
• fix race condition potentials
• make 'map' of the level at the start
  • either 0 for passable (dot, space) or 128 for impassable
  • player fills map with grey
  • enemies unplot themselves using map data (no more lost dots, crashing through scenery)

features:

• difficulty ramp
  • enemy spawn rate increases every level
  • enemy speed
• pick-ups
  • slow enemies
  • stop enemies
  • nuke enemies
  • poison
• timer
• enemy animations
• sound
• extra lives
• different enemy types
• character animation tables (and hence UDG possibility) for:
  • boring head
  • enemies
• title screen
• game over screen
• control customisation
• music:
  • level begin jingle
  • level complete jingle
  • title screen
  • game over screen

whimsy

• cloud animation
• lorry animation
• message?

enemy behaviour

• turn around when obstructed

If you're reading this well done! The ZX81 scene is dead. Long live the ZX81 scene.