Aspect #09 21 мая 1998

Программирование     Ассемблер

Programming - Print string to 42 characters.

       Hello, readers ASPECT'a!

 This routine will be helpful to those who
manufactures computer magazines, newspapers,
Who makes the text editors and viewers
by Speck.

 Just want to say - better to learn to catch the
fish rather than practicing eating. The method of printing a 
string, which is shown below, allows novice programmers - the 
encoder (and codes, because almost all of the best programs are 
written!), to better understand how to Use teams shift.

 Programming in the codes somewhere else,
on whatever machine you will win by
Compared with those who wrote their programs
high-level languages: BASIC, PASCAL,
ALGOL 68, PL1, FORTRAN, etc.
 Many people confuse what to write large
program in assembly language is difficult. Yes -
difficult. At first ... But acquiring the experience and
their library procedures, you can not not
assess the obvious advantages of programming
in assembler.
******************************************


    Here is an example of the shift command:


The second R in the team - Right, that is, right.

A =% 11100001; flag Half Carry = C

      RRCA> flag C

      <flag> C
A =% 11110000; moves like a carousel

 flag C = 1

A =% 11110000; flag Half Carry = C

      RRA> flag C