BPORT Question

To: CALC-TI@LISTS.PPP.TI.COM
Subject: BPORT Question
From: Mike Leister <leister@BAGHWAN.NSC.COM>
Date: Thu, 15 Jan 1998 16:06:59 -0800
Reply-To: Mike Leister <leister@BAGHWAN.NSC.COM>

I am experimenting with controlling the linkport and need some advice.  The following code is supposed to display three lines of text, then toggle the BPORT bits.  When I run the program, it shows the text then crashes, requiring removal of all batteries.  I connected it to an oscilloscope, and saw the bits go low momentarily as I ran the program.  Any suggestions?  Also, I am trying to make a loop that would toggle the BPORT 256 times so I can measure it on the scope.  My problem is with the syntax.

Any help would be appreciated.

Mike


.NOLIST
#define equ .equ
#define EQU .equ
#define end .end
#include "ti83asm.inc"
#include "tokens.inc"
.LIST

.org 9327h

                call    _clrlcdfull

                ld hl,0203h
                ld (CURROW), hl
                ld hl, Str1
                call    _puts

                ld hl,0204h
                ld (CURROW), hl
                ld hl, Str2
                call    _puts

                ld hl,0205h
                ld (CURROW), hl
                ld hl, Str3
                call    _puts

                LD      A,D0HD1H
                OUT     (BPORT),A    ; is used for setting D0 high, D1 high

                LD      A,D0LD1L
        OUT     (BPORT),A    ; is used for setting D0 low, D1 low


ret

Str1: .db "MIKE'S          ",0
Str2: .db "REMOTE",0
Str3: .db "CONTROL",0
  
.end

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