ref: aa27080e29e04dadb9986cd4f1f73579a3b01e96
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:: ; 2fef ld hl, rKEY1 bit 7, [hl] jr z, SwitchSpeed ret ; 2ff7 NormalSpeed:: ; 2ff7 ld hl, rKEY1 bit 7, [hl] ret z ; 2ffd SwitchSpeed:: ; 2ffd set 0, [hl] xor a ld [rIF], a ld [rIE], a ld a, $30 ld [rJOYP], a stop ; rgbasm adds a nop after this instruction by default ret ; 300b