Hardware - Additional graphics mode 512x192.

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   From the editor: in today's issue
We present to you a small modification, which
which has become increasingly ac-
more toilet.  We are talking about additional gra-
physical mode 512x192.  It allows you to
text mode have up to 85 on screen
characters per line in 6x8 font, which allows
will help you preserve your vision over a long period of time?
no work with texts.
   The scheme has been repeatedly published in the world
current newspapers of the Spectrum world, and we decided
keep up with them, especially not everyone
Tashkent Sinclairist has access to light
pressing numbers of Russian newspapers.

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(C) V.M.G. Kharkov, Ukraine.

     Additional graphics mode

   The proposed mode allows you to locate
live on screen 512 dots per line or 85
characters with a 6x8 matrix, which will allow
place a significantly larger amount of in-
formations and make it more convenient to work with
text, monochrome graphics, terminal-
ny programs.

   The numbering of elements in the diagram is given in relation to
relative to the Pentagon scheme (by V.M.G.) and can-
may not coincide with your diagram (see figure-
nok).

 (output >──) send a signal from the output of the form
microcircuit that destroys it
 (output <──) apply a new signal to the output,
cutting off the old one

   SEL signal - inverted signal
from pin 10 ID7(see connection diagram
modem in Online'78). Also on top
D38 must be soldered to D38' (15ЗЗИР23)
all outputs connected to D38, and the inputs
connect to the corresponding outputs of D37.
Signals are supplied to the 1st pins D38 and D38'
C3 and 2-D3, and on the 11th pins the signals C29 and
C3 respectively.   Also on conclusions
9,12,15,16,19 D40 chips needed
Apply ground through 1K resistors.

   Refinement is enabled by setting bit 1
port #EFF7 and turns off via RESET or
by resetting the same bit. After inclusion in
two areas of memory are formed -
#4000-#57FF - even bytes on the screen, and
#6000-#77FF - odd bytes on the screen.
The second screen is addressed similarly
(#C000-#C800 and #E000-#E800).

      Byte layout on screen

   ┌────┬────┬────┬────┐ ┌────┬────┐
   │4000│6000│4001│6001│...│401F│601F│
   └────┴────┴────┴────┘ └────┴────┘

                Addition

   It is also worth adding that bit 0 of the port
#EFF7 is reserved for another add-on
real graphics mode - attribute on
byte, i.e. located at addresses #4000-#57FF
women have a standard Sinclair screen, and
addresses #6000-#77FF - corresponding to each
home byte from the main screen byte attri-
buts, and in this byte the bits are those
same purpose as in standard attributes
max, except for bits 6 and 7, which
are now responsible for PAPER respectively
BRIGHTand INK BRIGHT. Rework consists of
one chip - 15ZZKP11 and allows
carry out effects without much difficulty
type MultiColor without spending any money on it
single processor cycle (except
of course, placing information on the screen
area).