Xref: utzoo comp.sys.ibm.pc:15618 comp.periphs:950 comp.sys.misc:1429
Path: utzoo!attcan!uunet!husc6!think!ames!oliveb!pyramid!octopus!pete
From: pete@octopus.UUCP (Pete Holzmann)
Newsgroups: comp.sys.ibm.pc,comp.periphs,comp.sys.misc
Subject: HERE IS THE RLL code! (unburied sooner than I thought...)
Message-ID: <226@octopus.UUCP>
Date: 16 May 88 19:57:19 GMT
Reply-To: pete@octopus.UUCP (Pete Holzmann)
Followup-To: comp.periphs
Organization: Octopus Enterprises, Cupertino CA
Lines: 38

[Note: I've directed followups to comp.periphs, although I don't personally
	read that group]

You asked for it; I happened to find a copy in one of my magazines (Fall
1986 Computer Technology Review)... so here it is: the RLL code!

I think you'll agree that it *is* a variable length code, with constant
encoding density. It is kind of fun to play with it and verify that it
really is a 2,7 RLL code. It isn't at all obvious how to start with "I
want a 2,7 RLL code" and end up with this chart:

	Data		Code

	1		00
	01		0001
	10		0100
	11		1000
	000		100100
	001		001000
	010		000100
	0110		00100100
	0011		00001000

Have fun!

Pete

P.S.: People have requested the ERLL and ARLL codes. I don't have them handy.
	I'm not sure I have a recent enough printed reference. I know where
	to go (actually, who to talk to) to get the chart; but if somebody
	on the net has the codes handy, maybe they can pipe up! I can't be
	the only one with access to this stuff!

-- 
  OOO   __| ___      Peter Holzmann, Octopus Enterprises
 OOOOOOO___/ _______ USPS: 19611 La Mar Court, Cupertino, CA 95014
  OOOOO \___/        UUCP: {hpda,pyramid}!octopus!pete
___| \_____          Phone: 408/996-7746