"IBM personal computer assembly language tutorial" - читать интересную книгу автора (Auerbach J.)

bility need to be considered: machine portability, operating system porta-
bility (for example, the ability to assemble and run code under CP/M 86)
and DOS version portability (the ability for a program to run under older
versions of DOS>.

Most of the functions originally offered in DOS 1.0 were direct descendents
of CP/M functions; there is even a compatibility interface so that programs
which have been translated instruction for instruction from 8080 assembler
to 8086 assembler might have a reasonable chance of running if they use
only the core CP/M function set. Among the most generally useful in this
original compatibility set are








IBM PC Assembly Language Tutorial 12


09 -- print a full message on the screen
0A -- get a console input line with full DOS editing
0F -- open a file
10 -- close a file (really needed only when writing)
11 -- find first file matching a pattern
12 -- find next file matching a pattern
13 -- erase a file
16 -- create a file
17 -- rename a file
1A -- set disk transfer address

The next set provide no function above what you can get with BIOS calls or
more specialized DOS calls. However, they are preferable to BIOS calls
when portability is an issue.

00 -- terminate execution
01 -- read keyboard character
02 -- write screen character
03 -- read COM port character
04 -- write COM port character
05 -- print a character
06 -- read keyboard or write screen with no editing

The standard file I/O calls are inferior to the specialized DOS calls but
have the advantage of making the program easier to port to CP/M style sys-
tems. Thus they are worth mentioning:

14 -- sequential read from file