Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!jarthur!bgribble
From: bgribble@jarthur.Claremont.EDU (Bill Gribble)
Newsgroups: comp.sys.handhelds
Subject: HP48 machine language
Message-ID: <8377@jarthur.Claremont.EDU>
Date: 13 Sep 90 23:07:19 GMT
Organization: Harvey Mudd College, Claremont, CA 91711
Lines: 28

Let me preface this by saying that my only machine language programming
  experience prior to the 48 was a 2-week segment on ml in a cs class.
  While I feel like I'm learning pretty fast, these questions might seem 
  kind of moronic to anyone with any real experience in ml.

1.) What is the procedure for allocating and using large chunks of memory?
  Say, f'rinstance, that I wanted to rewrite DUP.  I know how to fiddle
  the stack pointers to tell the system that another object is on the 
  stack; I know enough about object representation to find and deal with
  the object in level 1, and even how big it is; but how do I find a free
  memory chunk large enough for a copy of the object?  I assume the system
  maintains a list of free segments; how do I find it and alter it, if
  that's what I need to do?

2.) I think this was asked before, but how do I read the keyboard from ml?
  'nuff said.

Enough for now.  Just by way of a progress report (in case anyone cares)
  I've passed all the major technical/conceptual hurdles (I think) to
  rewriting my terminal emulator in machine language.  It might be out by 
  the end of the semester, if we're lucky (and Systems doesn't kill me).

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