A86: r register?

To: assembly-86@lists.ticalc.org
Subject: A86: r register?
From: ComAsYuAre@aol.com
Date: Fri, 16 Oct 1998 21:25:49 EDT
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


i was looking around in the source to solitaire when i came across Jimmy
Mardell's pseudo random routine.  i understand basically all of it except for
the second line, which is "ld a,r".  what is the r register?  i've never heard
of it.  does it always contain some sort of random value or something?


;Randomization routine by Jimmy Mardell (used in ZTetris v3.0)
PRandom:	       ; Creates a pseudorandom number 0 <= x < A
   ld b,a
   ld a,r			;<-----what the heck is this??????
   add a,a
   ld hl,0
   ld d,0
   ld e,a
RMul:
   add hl,de
   djnz RMul
   ld a,h
   ret

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