Contact
Alone Coder
Usually in the section we talk about
call for any improvement
our Speccy, which due to its excessive complexity
Only a few of the schemes can produce.
At first the editor wanted to do this: put
article by V. Makarov on turbocharging, but
It turned out to be somewhat difficult to contact him.
more than I thought, so I had to put it here
your article.
I'm not good at radio engineering: installing
a microcircuit for me will probably be more difficult,
than to dig a hole a meter deep, and about boards
there’s nothing to say; the maximum of what I
I can do it - solder a couple of wires.
It’s about two wires (i.e. a contact)
and will be discussed below.
■R Out of habit, I’ll go into memoirs:
■S - But when I was young...cough-
■T cough...(joke)
■In short, I once had forty
■F eighth computer with a floppy drive (and
■There are such things!), which has half
■Ts of microcircuits stood in blocks (RUSHKI
■H including), and I somehow pressed
face (accidentally) at one of them, on which
swarm it was written <К555ЛН2>, and the screen of my
Speccy for some reason rang out in
height. I became interested in this and began
close all pins of this microcircuit with plus-
catfish and minus, trying to reproduce what
I saw and discovered that this effect is
occurs when the 12th and 14th legs are closed.
Soldering to the indicated terminals along the wiring and
I twisted themgot the opportunity to thoroughly
to study an unexpected sight. And randomly
this is what happened: the upper third of the screen was duplicated
fell, and above it another one appeared
well, and six familiar signs appeared under the screen
completely incomprehensible information.
Further study of this information yes-
the following results. It turned out that the oil
what (drawing) for this third
serves memory from #5800 to #5FFF, various
the bathroom is the same as a regular third. Attribute-
you were kept in an area logically pre-
assigned to them, that is, from #5B00 to #5BFF
(immediately after the attributes - the printer buffer).
One could immediately guess that in this
thirds cannot use lines 3,11,...,
because in them the area of attributes coincides
gives addressable with mask area;super-upper
(what a word!) a third could have been used
work without restrictions, as long as it is timely
take her so that she doesn't look too much like
its twin - the upper third. I wrote
then only the procedure for showing a high card
teens, but obviously the number of effects is
received with this contact is limitless.
When I got the Pentagon, I was the first
I started looking for the same microcircuit as
and there, and there were a lot of LNOs on the board, and the first ones,
and second, but none of them provided
desired result, and I gave up searching.
After a year or a year and a half I decided to look
contact according to the logic diagram supplied
to the computer board (the computer was homemade -
noahassembly). It was possible to find a display scheme
not difficult, all you had to do was call everything
microcircuits lying in this area that I and
did. The required chip is called
KR1533LE1, the legs that need to be closed -
13th and 14th. (For those who don't know: legs
numbered from the top of the key counterclockwise
arrows from one, that is, those indicated above
lie on the top right when looking at the board
from the side of the elements, but a recess in the microcircuit
see above. Or, even simpler - if
the notch on the chip corresponds to XII on
clock face, then the legs are somewhere at I and II.)
You don’t even have to solder the wiring, because
adjacent legs are closed and a simple opening
this way. Insert a screwdriver between the indicated
legs, and she will stick out like a Pisa
tower, forming the same contact.
Since Pen is one hundred and twenty-eighth, then
changing the coloring of the upper third of the production
This is done by simply switching between screens.
Nichek.You can add such an interruption.Pro-
the problem of using the super-lower third
I place it entirely on your shoulders. I myself don't
came up with nothing simpler than interruption
a device that consumes 80-85% of CPU time.
A leaflet program using such a pre-
tearing and such contact is located in Applo-
zheniya and is called PRCHAR2.H. First follow-
You can select the name of the file you are viewing from
appeared on the screen (in normal mode)
catalogue, and then use the arrows.
I want to warn you right away: contact mayis located in other places on the board, but it
must be on the computer. My computer
ter is assembled on a board, the logic circuit of which
the swarm spread xeroxed and containing
pressed the signature . The board itself looks like
roughly like this:
┌──────────────────── ────────────────────┐
╪
│ │ ╔══╦══╗ ╪
│ │ ╠══╬══╣ ╪
│ │ ╠══╬══╣ ╪
│ │ ╠══╬══╣microcircuit,on╪
│ │ ┌ROM┐ ╠ROM╣which image-╪
│ │ └───┘ ╠══╬══╣legs are injured,╪
│ │ ┌VG93┐ ┌Z80A┐╠══╬══╣what to close:╪
│ │ └────┘ └────┘╠══╬══╣┌─┐┌─┐╟─┐┌─┐ ╪
│ │ to the Cetronix drive╝└─┘└─┘└─┘└─┘ ╪
└──────╫╫╫╫╫╫╫╫╫╫╫─╨╨ ╨╨╨╨╨───────────────┘
Share your thoughts about the article