JohnConnolly0

LD A,R			; Load the A register with the refresh register
LD L,A			; Copy register A into register L
AND %00111111		; This masking prevents the address we are forming from accessing RAM
LD H,A			; Copy register A into register H
LD A,(HL)		; Load the pseudo-random value into A

; HOW THIS WORKS

; The refresh register in the Z80 is highly unpredictable since it is incremented every cycle.
; Because it may be at any value when this routine is called, it is very good for random numbers.