ADDR B1 B2 B3 B4 X:\public_html\EEL4746\programs\Hello World\     PAGE       1

                   * Popular equates

                   EXT_RAM_START     EQU   $0200   * Start of external RAM in U5
                   BUF_UTLJMP_START  EQU   $ffa0   * Start of Buffalo utility
.                  subroutine jump table in ROM
                   JUMPINST_SIZE     EQU   3       * Length of jump opcode + 2
.                  byte addr
                   EOT               EQU   $04     * ASCII code for "end of
.                  transmission"

                   * Define the entries in the Buffalo utility jump table

                            ORG    BUF_UTLJMP_START
                   UPCASE   RMB    JUMPINST_SIZE   * Convert character to
.                  uppercase
                   WCHEK    RMB    JUMPINST_SIZE   * Test character for
.                  whitespace
                   DCHEK    RMB    JUMPINST_SIZE   * Check character for
.                  delimiter
                   INIT     RMB    JUMPINST_SIZE   * Initialize I/O device
                   INPUT    RMB    JUMPINST_SIZE   * Read I/O device
                   OUTPUT   RMB    JUMPINST_SIZE   * Write I/O device
                   OUTLHLF  RMB    JUMPINST_SIZE   * Convert left nibble to
.                  ASCII and output
                   OUTRHLF  RMB    JUMPINST_SIZE   * Convert right nibble to
.                  ASCII and output
                   OUTA     RMB    JUMPINST_SIZE   * Output ASCII character
                   OUT1BYT  RMB    JUMPINST_SIZE   * Convert binary byte to 2
.                  ASCII characters and output
                   OUT1BSP  RMB    JUMPINST_SIZE   * Convert binary byte to 2
.                  ASCII characters and output followed by space
                   OUT2BSP  RMB    JUMPINST_SIZE   * Convert 2 consecutive
.                  binary bytes to 4 ASCII characters and output followed by
.                  space
                   OUTCRLF  RMB    JUMPINST_SIZE   * Output ASCII carriage
.                  return followed by line feed
                   OUTSTRG  RMB    JUMPINST_SIZE   * Output ASCII string until
.                  end of transmission (004)
                   OUTSTRG0 RMB    JUMPINST_SIZE   * Same as OUTSTRG except
.                  leading carriage return and line feed is skipped
                   INCHAR   RMB    JUMPINST_SIZE   * Input ASCII character and
.                  echo back

                   * Here's our actual program.

                           ORG     EXT_RAM_START   * Start code at beginning of
.                  external RAM

                   * "Hello" subroutine, prints "Hello World!" on Serial Comm.
.                  Interface.

  0200 CE 02 07    HELLO:  LDX     #MSG            * Point X at "Hello World!"
.                  string
  0203 BD FF CA            JSR     OUTSTRG0        * Call appropriate "Out
.                  String" subroutine to print
  0206 39                  RTS                     * Return from subroutine

  0207 48 65 6C 6C MSG:    FCC     'Hello World!'
. 020B 6F 20 57 6F
. 020F 72 36 64 21
  0213 04                  FCB     EOT

  Symbol Table 

  INCHAR             FFCD
  Symbol Table     X:\public_html\EEL4746\programs\Hello World\     PAGE       2

  OUTA               FFB8
  HELLO              0200
  INIT               FFA9
  OUTLHLF            FFB2
  UPCASE             FFA0
  OUTRHLF            FFB5
  DCHEK              FFA6
  OUTCRLF            FFC4
  JUMPINST_SIZE      0003
  MSG                0207
  BUF_UTLJMP_START   FFA0
  OUT1BSP            FFBE
  WCHEK              FFA3
  OUTSTRG0           FFCA
  EOT                0004
  OUTSTRG            FFC7
  EXT_RAM_START      0200
  INPUT              FFAC
  OUT2BSP            FFC1
  OUT1BYT            FFBB
  OUTPUT             FFAF