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EXAMPLE.ASM
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Assembly Source File
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1986-11-02
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3KB
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66 lines
; To become familiar with the segment feature you
; should assemble this file with and without the
; single object module swicth enabled.
;
; a48 -o example ;three object module files
; code.seg
; memory.seg
; rom2.seg
;
; a48 example ;one object module file example.obj
jmp loop
.org h'20 ;start assembly at location 20 hex.
.segment .memory ;declare a new segmemt for ram memory
;allocation
.memory ;select segment .memory as active(locaton counter)
;for the .code segment(created by the assembler) is
;saved for when we switch back.
.org h'00 ;not really necessary as origin of 0 is assumed.
regbank0:
b0r0: .rs 1 ;bank 0 register 0
b0r1: .rs 1 ;bank 0 register 1
b0r2: .rs 1 ;bank 0 register 2
b0r3: .rs 1 ;bank 0 register 3
b0r4: .rs 1 ;bank 0 register 4
b0r5: .rs 1 ;bank 0 register 5
b0r6: .rs 1 ;bank 0 register 6
b0r7: .rs 1 ;bank 0 register 7
.org 24
regbank1:
b1r0: .rs 1 ;bank 1 register 0
b1r1: .rs 1 ;bank 1 register 1
b1r2: .rs 1 ;bank 1 register 2
b1r3: .rs 1 ;bank 1 register 3
b1r4: .rs 1 ;bank 1 register 4
b1r5: .rs 1 ;bank 1 register 5
b1r6: .rs 1 ;bank 1 register 6
b1r7: .rs 1 ;bank 1 register 7
.eject ;lets start on a fresh page of paper.
.code ;switch back to code segment
; origin is where we left off.
loop: mov a,#h'22
mov r0,#h'11
add a,r0
jmp loop2 ;jump off page.
.equ cr,13 ;equated idienifiers are constant.
.equ tab,9
.set temp,23 ;set identifiers may be re-set.
.set temp,24
.set temp,25
.db 1,2,3,4,5,'p'
.db 6,7,"this is a test\r\n\0"
.dw 1,h'1234
.drw 1,h'1234
.page ;start on a new 256 byte boundary.
loop2: jmp loop
.segment .rom2
.rom2
.org h'800
.db "this is possibly an external rom programmed seperately."
.code
.end loop ;end of assembly, specifying start address.