Move #08 18 июля 1997

Железо

Iron - Customize the signal INT.

                 IRON


         Adjusting the signal INT

(C) Hamer MDM 221-83-65


    I decided, therefore, to write about INT'e.
So: INT'y are different. In corporate
48-m Spectrum'e signal INT is generated
Personnel at the end of sync (IAC), and
at the Pentagon - in the beginning. And since
standard we have (in at least
demomaykerov) became the Pentagon, the
zhelatelnno have a scheme which
would generate Pentagon INT. When
processor frequency 3.5 MHz Standard
duration was 9 ms or 32
machine cycles. Sign too
Short INT'a may be inhibition
demos, such as a demo in BRAIN CRASH
part where the eye is drawn, there
excessive braking. A similar
phenomenon can occur in VIBRATIONS,
Again, in part with the eyes. :-)

Scheme Pentagon INT'a:


   3000-4300pF

           * 1 1 2 ___
 KSI o o o INT



         * / \ KR555LN1

  1 1.5kOm

                    KD522



    The capacitor and the resistance
resistors are chosen empirically.
Instead of the resistor can be placed
podstroechnik on 2kOm and achieve
optimum duration INT'a, for example,
to test Kovalevsky. Inverter (LN1)
can be put in front of the condenser, then
scheme is as follows:


                    +5 V


                    o

                  *

           1 1.5kOm / \ KD522



      1 1 2 ___
 KSI o o o INT

                  *

              3000-4300pF

      KR555LN1

Chip can be placed not only LN1, but
and other small logic with inverters:
LN1, LN3, LE1, LA3 etc For example:

 LA3 included as follows: LE1 like this:

      February 1

        '3 1 1

     oo o o


      March 2

In all of chips: the seventh output - a common,
14 - +5 V.


    If, however, after correcting INT'a,
Some demos still continue
stall, it is because of the fact that between
INT'ami fit too few cycles,
and here one korektirovkoy INT'a not
do. Although the normal INT - better
left. :-)