ZX Pilot #30 19 декабря 1998

Железо

HARD and SOFT - Connect the monitor to the CGS Spectrum.

          H A R D A N D S O F T



(C) VEL


   Hi! Today we talk about iron, but
it is not difficult to finalize Pentagon'a.

   A little background. It all started long ago, when I parted 
with poor mono sound from the speaker of my TV. Taurus has 
collected for me and I cool'ny usilok connected to it at least 
cool'nye column. 

   That's when me and began to pester friends and acquaintances 
by saying that I have sound some do not like that. 

   Mongol said that with the help of Syrus'a
made some sort of revision is not difficult, from
What sound was just class.

   When I finally tired of "attacks" Friends, I went to visit 
with Syrus'u because it was he who first made these things 
better. 

   All well and found out for writing
paper, I went home. On the day of
my great happiness to me looked
Shotgun, and I persuaded him to make me
this wonder-completion (do not misunderstand me - well, I do 
not like to climb into your PC :-) 

   All operations on my Pentagon'om ended pretty dystro and as 
it turned later, successfully. After I turned

computer, Shotgun finally found their Mouzon, and I heard a new 
music in games and demos.


   After all this, and Sam made this
completion and was very pleased.

   So now four people have improved the sound of their favorite 
Pentagon'ov: Syrus / EI, Mongol / DC, Vel / PXM, Sam / PXM. A

because many Pentagon'ov in Russia and CIS!

   Okay, enough of the lyrics and go directly to the 
description of your revision com.


   You only need that connect the 22-th
leg AY-3-8910 (or 15 th leg AY-3-8912)
wire with the third leg m / s 155IE7 before
This unsolder it (wire), if it was connected to the other leg.

   Hopefully, the following is not clever design will help you 
figure it out yourself. 



            AY-3-8910



              22-th leg


              3rd leg



        155IE7



           ° ° ° ° °


(C) AV Apollo, Arzamas, 1998



         Connection CGA-Monitor


   Recently, when connected to the ZS-256-T +
Color IBM'ovskogo CGA-Monitor had
face several problems: since the CGA
Monitors are designed for TTL signals levels
positive polarity signals lowercase
and frame synchronization is required to invert, but the main 
drawback - because of individual signal Intensity (brightness)

there is a bright-white (whitish) color,
which makes the graphics are terrible.

   Below is my shemka, providing easy connection CGA-Monitor, 
and This black color - always black, ie

provided to all 15 (not 16!) Spectrum colors.


               1

   CSI-3 'CSI

   12D42 2 o 9 CGA

                  D1.1



               4

   -FID '6 IPS

   13D42 5 o 8 CGA

                  D1.2



      R VD1 R1 2K R

  7D43> 3 CGA

      G VD2 G

  4D43> 4 CGA

      B VD3 9 B
 12D43> 'August 5 CGA

      I 10 o

  9D43 D1.3


 VD1-3 KD520 1912

                        '11 I
 D1 K555LA3 13 o 6 CGA

                        D1.4



   RGB signals to the monitor are taken directly from the chip 
D43 (KP11). 

   Scheme is sufficiently critical to par
resistor R1.


   Built-CGA (9-pin):


       1 Earth Shield


       2 Ground Land


       3 Red Red


       4 Green Green


       5 Blue Blue


       6 Intensity Brightness


       7 Nc Reserve


       8 H. Sync Str.Sinhr.


       9 V. Sync Kadr.Sinhr.



   Similarly, you can connect a CGA-Monitor
to any Spectrum.

   For the Pentagon-128 signals must be taken with
the following chips:


   Brightness - 9 foot D47

   str.sinhr - 1 foot D6

   kadr.sinhr - 2 foot D6

   Red R - 3 foot D72

   Green G - 6 foot D72

   blue B - 8 foot D72


   By the way, you can use and EGA monitors. They are designed 
to operate in two modes - CGA and EGA. This is sometimes 
visible indication of MODE 1 and MODE 2 on the body monitor. 
EGA - Monitor analyzes the polarity of horizontal sync pulses 
arriving at its input. If the polarity is is positive, then the 
relay switches the unit line scan at a frequency of about 16 kHz

(MODE1-CGA). If the vertical sync
have a negative polarity, the monitor
switches to the frequency of EGA - about 22 kHz
(MODE 2).


   Built-EGA (9-pin):


             1 Ground


             2 Dop.Krasny


             3 Red


             4 Green


             5 Blue


             6 Dop.Zeleny


             7 Dop.Siny


             8 Str.Sinhr.


             9 Kadr.Sinhr.