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Ingy döt Net 2023-07-01 11:58:00 -04:00
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; This is Hello World, written in 8080 assembly to run under CP/M
; As you can see, it is similar to the 8086, and CP/M is very
; similar to DOS in the way it is called.
org 100h ; CP/M .COM entry point is 100h - like DOS
mvi c,9 ; C holds the syscall, 9 = print string - like DOS
lxi d,msg ; DE holds a pointer to the string
jmp 5 ; CP/M calls are accessed through the jump at 05h
; Normally you'd CALL it, but since you'd end the program by RETurning,
; JMP saves a byte (if you've only got 64k of address space you want to
; save bytes).
msg: db 'Hello world!$'