System - about the “Forced interruption” commands of the small circuit of the KR1818VG93 floppy disk controller.

-----===== S Y S T E M --- S I S T E M A =====-----

+------------------------------------------------------------+

In the "System" section of this issue we will tell you, dear
advanced, about the commands "Forced interruption" of small circuits
floppy disk controller KR1818VG93. For some reason many magazines
do not write about these teams, and we decided to make up for this depressing
gap.
~~~~~~~~~~~
So, the fourth type command "PP" is intended for
immediately stop working with the disk. For example, you wrote
cool commander, and don’t know how to speed him up? After all
after an incorrectly read byte, a flag is set to notify
about an error, and your program could scan it
constantly.  But how can you instantly stop spinning the disk? Here you are
with a smart look, load ZXAsmЗ.0, set the check and command
"PP".  Now your commander will work with the disk faster
everyone!
Well, now - descriptions of the varieties of these commands.

11010001 ── interrupt will be executed when the signal transitions from low
            whose level is high.
11010010 ── interrupt when CPRDY transitions from low level to
            tall.
11010100 ── interrupt upon arrival of the IP index pulse.
11011000 ── immediate interruption.