assembly - Call 5 interface on MS-DOS -


i have hello, world program ms-dos uses int 21h make system calls.

mov dx,hello mov ah,9 int 0x21 mov ah,0 int 0x21

"hello" address of string 'hello, world',13,10,'$'.

the program works.

however, when replace (the first) "int 0x21" "call 5", program crashes computer (i.e. virtualbox virtual machine running pts-dos). on dosbox terminates , returns command prompt.

i tried using different registers address , call number got same result.

now wondering...

  1. do later versions of dos not support cp/m compatibility call 5 interface more?
  2. do pts-dos , dos in dosbox not support call 5?
  3. am using interface wrong?
  4. do have configure segment registers first? (i tried setting segment registers zero.)

any ideas?

update: accepted answer because correct per documentation. still doesn't work might due version of dos or other problem.

is there version of dos you've seen cp/m "call 5" work? started dos 2.1, did write code 1.1 , cp/m compatibility saw in fcbs. of course, wasn't explicitly looking it, don't recall "call 5" being reported supported anybody...

followup:

the latest psp definition (as listed on web, ymmv) indeed have "call 5" interface supported. true dos compatible environment should support it.


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