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;************************************************************************
; example.s
;************************************************************************
.title z80sim Test
.module example
;************************************************************************
; Constants
;************************************************************************
STACKBASE == 0xFFFF
;************************************************************************
; Data
;************************************************************************
.area DATA (ABS,OVR)
.org 0x8000
hello:
.ascii "Hello, World!\n\0"
;************************************************************************
; Reset entry point
;************************************************************************
.area TEXT (ABS,OVR)
.org 0x0000
di ; Disable interrupts
ld SP, #STACKBASE ; Set stack pointer
im 1 ; Set interrupt mode 1
jp start ; jump to start of program
;************************************************************************
; Interrupt handler
;************************************************************************
.org 0x0038 ; Int mode 1
reti ; return from interrupt
;************************************************************************
; NMI interrupt handler
;************************************************************************
.org 0x0066
retn
;************************************************************************
; Start of program
;************************************************************************
.org 0x0100
start:
;ei ; Enable interrrupts
ld hl, #hello ; Say hello
call print
forever: ; Then stop execution
jp forever
;******************************************************************
; print *
; Funktion....: Sen tekst and data with serielport *
; Input.......: hl points at text start adr *
; Output......: Text to serielport *
; uses........: a,hl*
; call........: TX_BUSY tst 28-4-1994 *
;******************************************************************
print:
push af
loop:
ld a, (hl) ; Get character to print
cp #0 ; Null terminates the string
jp z, done
out (0xbe), a ; Send character
inc hl ; Increment to next character
jp loop ; Loop til done
done:
pop af
ret
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