development platform - Connection CGA-Monitor to a ZX Spectrum.

<b>development platform</b> - Connection CGA-Monitor to a ZX Spectrum.

  The purpose of this text - to help spektrumistam
in connection ptsshnyh monitors. As
information on this topic can be found in
Moscow's electronic newspaper On-Line 56 and
59 and Kovrov ZX-Pilot 30. Special
thanks to Vladimir Yudin
(2:5061 / 7.27).

 When the monitor on the
option will have to dig deeper into
internal computer. Options without
change its scheme described in the above
above the electronic media. There is a third
option - disable the monitor itself that is necessary,
For example, if podklyuyuenii Amiga. If the y
who have experience in this field, throw
to Viktor Nerad'ko (2:4600 / 96.39) or
echo. So ...


  Wiring connectors:

1 - total (Shield);
2 - Earth (Ground);
3 - Red (Red);
4 - Green (Green);
5 - Blue (Blue);
6 - Brightness (Intensivity);
7 - not used (Reserved);
8 - horizontal synchronization (Horisontal
Sync);
9 - Vertical Sync (Vertical
Sync);


  If the power is no ground
contact, the land must be submitted and
The first conclusion connector. Colors
respectively, taken from the connector pins
XP1 B17, B19, B18. Attention! In some
variants of the error. Brightness
Served with 9D47, a horizontal synchronization
8D7, and personnel with 8D5.

 When properly connected, all the signals
on the screen will be displayed. If
it shakes, it should be buffered
horizontal drive signal. In
some variants of monitors without a difference
what he polarity, so you can
buffer and the inverting
element.


  In fact, a bit more complicated than
seems at first glance. It turns
now stands bright black
paper and ink, which should not be.
To solve this problem can be hardware
turning off the brightness of that color. This makes
diagram below.


 2D40 Jan. 1 '9 D47
 5D40 LL1 LL1 LI1

                        10

      6D40 x

          16D40 x11

                   '
 9D40 1 January LI1
12D40 LL1 LL1


     15D40


   x - a gap in the printed guide
computer's motherboard. Pin numbers and
chips are given under the scheme the Pentagon.
The remaining elements of the free chips
1533LL1 can be used to
buffering.


  In this connection can be considered
complete.


  P.S. The fact that yellow is OFF
Brightness is not yellow, but brown is not so
and bad. For me, at least krayney,
better than without any gradations of brightness.
;-)