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From: bson@rice-chex.ai.mit.edu (Jan Brittenson)
Newsgroups: comp.sys.handhelds
Subject: More on the HP-48 catalog
Keywords: hp48 hacks internals
Message-ID: <14122@life.ai.mit.edu>
Date: 18 Mar 91 21:56:11 GMT
Sender: news@ai.mit.edu
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Lines: 66


   This is an addition to my previous post on the built-in catalog
routines.

I the following RAM locations are used:

	70623	Menu key program?
	7060a	Key program, called with 2: shift code, 1: scan code
	70605	Redisplay program
	70614	Error hook?
	7060f	?
	707d3	? (short)
	707c9	Index of leftmost displayed menu entry (short)


Local variables are used as follows:

	'savedUI

		Used to save (shallow-bind) the previous set of UI
		(User Interface?) variables.

	2nd local
		Current point index (1 = first)

	3rd local
		Window point index (index of topmost line)

	4th local
		List of names


   I also forgot to mention that if the value of a name is a
directory, it will appear as "dir", and pressing ENTER will, instead
of copying it to the stack, move the catalog into the directory.


   Here is a small example of how the standard catalog configuration
can be used to view a catalog of random strings:

	@ Call with list of strings on level 1

	<< LIST-> RCLF -> N F
	   << 1 N START
		#5B15 SYSEVAL	@ String --> Name
	        N ROLL
	      NEXT
	      N ->LIST
	      #3AC0 SYSEVAL
	      SWAP
	      -59 SF		@ Fast catalog
	      #47BF0 SYSEVAL	@ Walk
	      F STOF
	   >>
	>>


   It's probably a better idea to set up a custom configuration with a
new key program for the terminal emulator, though.


Happy hacking!
						-- Jan Brittenson
						   bson@ai.mit.edu

					   Read my lisp: no new classes!