On-Line #23 12 февраля 1996

Железо     Доработки

Iron - Block port # 1FFD on Ssorpion ZS-256.

                 IRON



   From the Editors "ON-LINE": The following article is 
"ripped" from the St. Petersburg magazine "ZX-FORMAT" # 1. We 
took advantage of accommodating permission for the article's 
author, believing that this revision certainly be interested 
and Moscow SCORPIONa owners. 

                ° ° ° °

          Vladimir Larkov presents:
        blocking the port # 1FFD on Scorpion ZS-256.


   Material prepared specifically for the Petrograd e
magazine "ZX-Format". Reprinting and redistribution of this 
article in other journals, electronic networks and other media

information (provided that the full scope of the article) the 
author are welcome. 


   We offer you a simple revision of fees
computer "Scorpion ZS-256", which will greatly facilitate the 
lives of its owners. 


   Recently divorced a sufficient number of programs
authors address a port half addresses, using for
switching pages command 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. She
block port # 1FFD, thus "passes" OUT (# FD), A and
Can not use rewrites programs, such as STS-ohm
see "SATISFACTION" or "INSULT". It should be remembered only
one - will not work with a button of the program, such as 
"TASM", kotorye climb into the ROM through the RST 8, because 
RST 8 under the control of shadow businesses who need to work 
the eighth page, and Naturally, the port # 1FFD.



   So, now more: press a button at any time,
while in boot-s or the program itself, should not only push the 
button from the main menu of your computer, because there is 
also "hosts" shadow businesses. So, for example: You need to 
run the 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 the "ENTER" in the main menu, 
tumbled in TR-DOS boot boot-a, push the button, start the 
program. 


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


   Second: that the button is pressed - does not prevent you to 
use shadow businesses! When you press "magic" port # 1FFD 
unlocked and you without any problems yourself in your favorite 
shadow businesses. Second control signal to unlock the port is, 
of course, "reset". Ie on "sborsu" or "Magic" returns to his 
computer port and extra pages.



   Thus, a further plus - button to
"Cheat" protection "Scorpio", based on scoring the eighth
page at random all sorts of rubbish. And though at inventing 
Revised 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 disturbing 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, the remaining from 
"turbirovanie SH" (if you have it done). Non-leg in the scheme 
given with this fact. 


   2. LL1 and LI1 mounted on a free field on the board. Their
not involved (yet) elements are still useful to us in the 
following refinement.



   3. For added convenience, it is recommended to display:

                  300 Om
                          +5 V
                             >
             __ __
             \ /
             _ \ / _ LED
               |
           10 kOm /

       9 (TM2) /
                        KT315
                     \
              / Emitter



   Soldering this thing, you never get stuck - when the
lock LED lights up when turned off - no.


   In conclusion, we want to dispel doubts indecisive - I
This revision of the establishment of more than two years ago, 
all this time did not reveal any negative - because until you 
do not click on the button, revision does not affect the scheme 
of the computer has not changed him. 

                     With best wishes, Vladimir.
                    St.-Petersburg, 23-Oct-1995.