*** IRON ***
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 the program, for example,
"TASM" kotorye climb into the ROM through the RST 8, because
RST 8 under control of shadow businesses who need to work the
eighth page, and, of course, the port # 1FFD.
So, now more: press a button at any time,
while in boot-e, or the program itself should not be pressed
just click from the main menu, your computer, because there too
"Boss" 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
with boot boot-a, push the button, start the program.
The only known me a boot, which is not friendly with button -
vintage boot Trubinova (probably uses RST).
Second - what is pressed down - do not you use exceeds the
shadow businesses! When you press "magic" port # 1FFD blocked
and you will no problems will appear in your favorite
tenevike.Vtorym control signal to unlock the port is, of
course, "reset". ie on "Sborsu" or "Magic" returned to the
computer port and the extra page.
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 did not take into account, it is one more
argument for improvement.
Now - the scheme:
==================================================
==============
Remove from lanes 1 foot D49 (without disturbing the road
itself!) Cut conductor between 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 to be done). Non-legs in the
scheme are with that in mind.
2. LL1 and LI1 mounted on a free field to plate.Ih untapped
(yet) elements are still useful to us in the next revision. 3.
For added convenience, it is recommended to display:
300 Om
+5 V
>
__ _
\ /
_ \ / _svetodiod
|
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 is established for more than two years ago, all
this time did not reveal any negative - in fact until no
click on the button, updating NO effect on the scheme of the
computer Does it consistently.
With best wishes, Vladimir.
St.-Petersburg, 23-Oct-1995
Text reformated by DYKSOFT / XFHG
Kovrov, 12-May-1997.
