Iron - Revised:-lock to port # 1FFD on Scorpion ZS-256

<b>Iron</b> - Revised:-lock to port # 1FFD on Scorpion ZS-256

Vladimir Larkov presents:

   blocking the port # 1FFD on Scorpion

                ZS-256.


   Material prepared specifically for
St. Petersburg electronic journal
"ZX-Format". Reprints and
distribution of this article in other
journals, electronic networks and other
media (at
subject to maintaining full ob'ema
article) the author are welcome.


   Your attention is invited
a simple refinement of the computer's motherboard
"Scorpion ZS-256", which will help
significantly ease the life of his
owners.


   Recently divorced
a sufficient number of programs, the authors
which port address on half
addresses by using for switching
team pages OUT (# FD), A. Such
programs refuse to work on
"Scorpio" because "Scorpio" is required
the full address of the port.


   This revision allows you to run
such programs. It blocks the port
# 1FFD, thus "passes" OUT
(# FD), A, and it is possible without overtime
programs to use for example STS-ohm
see "SATISFACTION" or "INSULT".

  It should be remembered only one thing - will not be
work with the button of the program, such as
"TASM", kotorye climb into the ROM through the RST 8,
as RST 8 under the control of shadow businesses who need to 
work the eighth page and, of course, the port # 1FFD.


  So, now more: press
button at any time while in
boot-e, or the program itself should not be
just press a button while in
main menu, your computer, because there too
"Boss" shadow businesses. So, for example:
You need to start STS - go to the TR-DOS,
press the button, run the program
RUN "STS". C surprised to observe that
the program works! Or, even simpler -
Press "ENTER" in the main menu
tumbled in TR-DOS boot boot-a,
button is pressed, start the program.

The only known me a boot, which
not friendly with button - the old boot
Trubinova (probably enjoy RST).


   Second - what key is pressed - not
prevents you from using shadow businesses! When
Pressing "magic" port # 1FFD
unlocked and you no problems
yourself in your favorite shadow businesses. Second
control signal to unlock
port is, of course, "reset".
Ie on "sborsu" or "Magic"
the computer returns to its home port and
extra pages.


   Thus, a further
plus - button allows you to "cheat"
protection of "Scorpio", based on
scoring the eighth page of any random
rubbish. And though at inventing
refine this effect is not taken in the
calculation, it is one more argument
for improvement.


Now - the scheme:

========================================
Remove from lanes 1 foot D49 (without violating
the road itself!)

Cut the wire between the 13 (D53) and
15 (D52).


                          1 (D49) track

  <O TM2 o

  +5 V on January 10 (D49) leg

        o oS 9

          12 Q LI1

             D 1

          11 '3
 1kOm o / C 2 August

          13 Qo o

            oR LL1

     / 2

    o o March 1

   mikrik 15 (D53) 1



      LI1

   1910 LI1

      'August 4
NMI 9 '6

                     13 (D53) 5


                      15 (D52)


Copyright (C) 1993-94 by Vladimir Larkov,

                          Dmitry Petrov.
========================================

Notes:
1. It is convenient to use half of TM2,
remaining from the "turbirovanie SH (if
it you have done). Rooms at the foot of the
diagram shows the light of this fact.

2. LL1 and LI1 installed for free
field on the board. Their unused
(Yet) elements are still useful to us in
following completion.

3. For added convenience, we recommend
to display:


                       300 Om

                              +5 V

                                 >

                 __ _

                 \ /

                 _ \ / _svetodiod


       10 kOm /
9 (TM2) /

                   KT315

                 \

                  / Emitter



Soldering is the case you've never
confused - when the blocking
LED lights up when turned off - no.


   In conclusion I would like to dispel
doubt indecisive - I have this
finalization of the establishment of more than two years
ago, during all that time did not reveal
no minus sign - in fact until
You do not press the button, updating NO
does not affect the computer's circuitry, not at all
without changing it.



       With best wishes, Vladimir.

       St.-Petersburg, 23-Oct-1995.

                          end of file