Hello, World program
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Scan day: 16 February 2014 UTC
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Description: Motorola 68000
* * Program to repeatedly display "Hello, World!" on the * Motorola 68000 * * Written by Stephane Brunet, Computer Engineering student * at Concordia University, Montreal, Canada. * * [email protected] * org $1000 ;Main function: use a jump to this address from debugger... main move.l #str,a0 ;load A0 register with address of string movem.l a0,-(sp) ;push address of string on stack bsr _puts ;branch to subroutine "_puts" bra main ;keep looping! org $2000 str dc.b 'Hello, World!',10,0 org $3000 ****** _puts ;Like C/C++ puts function (LF added) ****** ;returns nothing ;save regs movem.l d0-d1/d7/a0/a5/a6,-(sp) move.l 28(sp),a5 ;get address of string from stack ;find end of string move.l a5,a6 1$ move.b (a6)+,d0 ;get next char of string cmp.b #0,d0 ;is it a null? beq 2$ ; yes, found end of string jmp 1$ ; no, so keep looping 2$ subq #1,a6 ;don't print the null move.w #227,d7 ;call out1cr trap trap #14 ;retore regs & return movem.l (sp)+,d0-d1/d7/a0/a5/a6 rts ;end _puts END
Size: 1035 chars
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| Page title: | Motorola 68000 |
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