Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!UIAMVS.BITNET!AWCTTYPA
From: AWCTTYPA@UIAMVS.BITNET ("David A. Lyons")
Newsgroups: comp.sys.apple
Subject: Reading buttons with PDL()
Message-ID: <8801111752.aa10035@SMOKE.BRL.ARPA>
Date: 12 Jan 88 00:10:58 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 16
X-Unparsable-Date: Monday 11 Jan 88 4:48 PM CT

>Date:         Sun, 11 Jan 87 13:02:00 MEZ
>Sender:       INFO-APP Info-Apple List <INFO-APP@NDSUVM1>
>From:         Matthias Kapffer <KAPFFER%DMZRZU71.BITNET@CUNYVM.CUNY.EDU>
>Subject:      Re: Reading the Button with PDL() command
>
>I/O  addresses  from $C060 thru $C067 (cassette in/button 0-2/paddle 0-3) are
>repeated  immediatly after them.  Therefore a PDL(n), n= 4..7, will access the
>four one-bit inputs mentioned above.

I recommend NOT counting on this sort of thing.  If Apple hasn't documented it,
it might not work on future machines.

--David A. Lyons  a.k.a.  DAL Systems
  PO Box 287 | North Liberty, IA 52317
  BITNET: AWCTTYPA@UIAMVS
  CI$: 72177,3233