A82: ASM code problem

To: assembly-82@lists.ticalc.org
Subject: A82: ASM code problem
From: "Thomas J. Hruska" <thruska@tir.com>
Date: Mon, 07 Jul 1997 18:02:55 -0400
Cc: CALC-TI@LISTS.PPP.TI.COM, c958362@student.dtu.dk, ml@df.lth.se, toddlers@erinet.com
Reply-To: assembly-82@lists.ticalc.org

As you all have been noticing lately, I have been pretty active on this
mailing list.  Remember, I am the writer of the ASH <-> OShell-82
Development Kit.  I am also adding two major improvements in the next two
versions.  I need a little help with some code.

  push hl                  ; Temporarily store hl on the stack
  push de                  ; Temporarily store de on the stack
  ld hl,$38FA              ; $38 -> l, $FA -> h
  ld de,(ROM_LOCATION)     ; $00 -> e, $00 -> d
  add hl,de
  ld (FINAL_ADDR),hl
  pop de                   ; Retrieve de from the stack
  pop hl                   ; Retrieve hl from the stack
  call (FINAL_ADDR)

Could someone please go through and tell me what each of the uncommented
lines does (in terms of $38 and $FA).  Also, I need to know how the call
statement works (how it reads the value located in FINAL_ADDR).

THIS IS VITAL INFO. THAT I NEED TO FINISH THE NEXT VERSION OF ASH <->
OSHELL!!!

TIA,
Thomas J. Hruska

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Follow-Ups:

Re: A82: ASM code problem

From: Andrew Von Dollen <warn@mail.geocities.com>