* Program 1.
* A simple program to introduce the 68HC11 integrated windows development
* environment.
*

* un-comment either of the following two lines by removing a semicolon.
* The first targets your code for the simulator, the second the 12c trainer board.
$SET simulate
;$SETNOT simulate

$include "12c_io.asm"

* This line sets the origin at 100h in RAM
          ORG     100
SIGNON:   DW      'CMPE12C Simulator'
          DB      NULL
PROMPT:   DW      '>'
          DB      NULL

**************************************************************************
* Your program starts here indicated by the label "main:".  After startup
* code in 12_io.asm is done, it jumps to this label and continues running.
* Begin by initializing the stack frame by setting the stack pointer to
* somewhere nice, like the top of the far-heap in RAM.  Remember, the stack
* builds downward in memory (see Motorola Ref. Manual Sec. 6.1.3, pg 6-3).

main:     ldx     #7bffh        ;x <- 0x7bff
          txs                   ;sp <- x
* The internal uart must be setup for serial communications
          jsr     SETUPSCI
          ldx     #SIGNON
          jsr     OUTSTRING

loop:     ldx     #PROMPT       ;address of prompt
          jsr     OUTSTRING     ;write out sci
          jsr     INSCI         ;get a character from sci, returns in A
          jsr     OUTSCI        ;write A to the sci
          jsr     OUTCRLF       ;write cr/lf to sci
          jmp     loop