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; hellocpm.asm
; (C) 2004 Julian Albo.
; This code may be freely used.
; Simple hello world for cp/m, showing the use of some
; pasmo options to adapt cp/m programs for cp/m 86 or
; ms-dos.
; Assembly with:
; - For cp/m:
; pasmo hellocpm.asm HELLOCPM.COM
; - For cp/m 86:
; pasmo --86 --cmd --equ CPM86 hellocpm.asm HELLOCPM.CMD
; - For ms-dos:
; pasmo --86 --equ MSDOS hellocpm.asm HELLOCPM.COM
; This macro allows to easily adapt the program to run
; in ms-dos or cp/m 86, using the --86 option and, in
; the case of cp/m 86, the --cmd option.
; The MSDOS is really not needed, ms-dos can handle
; call 5 use, but under dosemu this does not work,
; I still don't know why. Defining MSDOS it runs in any
; dos clone.
BDOS_CALL macro
if defined CPM86
db 0CDh, 0E0h ; int 0E0h, bdos call in cp/m 86
else
if defined MSDOS
db 088h, 0CCh ; mov ah, cl
db 0CDH, 021h ; int 0CDh, ms-dos call.
else
call 5
; endif
; endif
endm ; BDOS_CALL
; Some cp/m values.
CPM_TPA equ 0100h
SYSTEM_RESET equ 0
PRINT_STRING equ 9
; Main program.
org CPM_TPA
ld de, hello
ld c, PRINT_STRING
BDOS_CALL
ld c, SYSTEM_RESET
BDOS_CALL
; Variables.
hello db 'Hello, world.', 0Dh, 0Ah, '$'
end
; End of hellocpm.asm
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