ref: fbcc8d1b0e05cace2abe2083a88a8c2304efc9d7
dir: /home/double_speed.asm/
; The CGB hardware introduces Double Speed Mode. ; While active, the clock speed is doubled. ; The hardware can switch between normal speed ; and double speed at any time, but LCD output ; collapses during the switch. DoubleSpeed:: ld hl, rKEY1 bit 7, [hl] jr z, SwitchSpeed ret NormalSpeed:: ld hl, rKEY1 bit 7, [hl] ret z SwitchSpeed:: set 0, [hl] xor a ldh [rIF], a ldh [rIE], a ld a, $30 ldh [rJOYP], a stop ; rgbasm adds a nop after this instruction by default ret