Dan Tandberg Companies Calliope Software Products Mazeball Metagraphics Rampager Timeblasters Articles Blast Effects on ZX81 Dear Editor Egg Timer Faster Pseudorandom Numbers HEXEDIT: A Simple Hexadecimal Machine Code Editor Minibreakout Not Entirely Clear Screener: An 'Instant' Screen Display Routine Software Joystick in BASIC and MC Starblasters