Sergey UnQuaiz

## keybase.md

      
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                UnQuaiz
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              Created
              March 25, 2021 02:25
            
          
    Keybase proof

I hereby claim:

I am unquaiz on github.
I am unquaiz (https://keybase.io/unquaiz) on keybase.
I have a public key ASALMYbJeQKCAOCCtr1JPDWJ4TTz6UqMyM4Xtf1XmWRI9go

To claim this, I am signing this object:

  
## ZX Spectrum Random number generators
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.
	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.