.cr  6800
        .tf  spam6800.obj,AP1
        .lf  spam6800
;=====================================================;
;       Infinite SPAM loop for the Motorola 6800      ;
;                 by barrym 2013-04-10                ;
;-----------------------------------------------------;
; Prints the message "SPAM" repeatedly to an ascii    ;
;   terminal (console) connected to a 1970s vintage   ;
;   SWTPC 6800 system, which is the target device for ;
;   this assembly.                                    ;
; Many thanks to:                                     ;
;   swtpc.com for hosting Michael Holley's documents! ;
;   sbprojects.com for a very nice assembler!         ;
;   swtpcemu.com for a very capable emulator!         ;
; reg x is the string pointer                         ;
; reg a holds the ascii char to be output             ;
;-----------------------------------------------------;
outeee   =   $e1d1      ;ROM: console putchar routine
        .or  $0f00
;-----------------------------------------------------;
main    ldx  #string    ;Point to the string
        bra  puts       ;  and print it
outs    jsr  outeee     ;Emit a as ascii
        inx             ;Advance the string pointer
puts    ldaa ,x         ;Load a string character
        bne  outs       ;Print it if non-null
        bra  main       ;else restart
;=====================================================;
string  .as  "SPAM",#13,#10,#0
        .en