A drop of solder - Diagram #1FFD ON/OFF for SCORPION ZS 256 based on the diagram published in ZX Format.

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(C) Cardinal/PGC/BDA
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 Scheme #1FFD ON/OFF for SCORPION ZS 256
based on the diagram published in
 ZX FORMAT.

   Hello, dear readers of our
magazine! I remember back in 1996 I
soldered the device #1FFD OFF from the magazine ZX
FORMAT #01. I've had this lotion for a long time
until 2000. I wouldn't say that she was me
suited (but I didn’t see other schemes), according to
because it only worked in one direction -
management. Those. press the button - port
#1FFD is cut off, but in order to
to turn it back on, I had to press
MAGIC or (worst of all) RESET. But not always
Yes, there was an opportunity to click on MAGIC, then
Well, the program, as luck would have it, has an active stack
uses, then, in general, crashes the 8th can.
Then I was a complete lamer in hardware, I could
onlydistinguish a resistor from a capacitor,
and not always :-) So I toiled... But then
I grew up and gained invaluable experience in circuit design.
technology, i.e. became very easy to distinguish
resistor from the capacitor ;-), and thought, well
why not do it humanely,
wave once: the port is cut off, press
the second time: the port is turned on, etc...
little... done! The diagram is given below, this
I'll explain in an hour what needs to be done.
   If the scheme is fromZX FORMAT'and you already have
worth it, thenNO NEW PARTS ARE NEEDED!
You just need to bring it to condition. If
you, in general, do not have such a modification, then
list of required parts:

┌────────────┐
│ Microchips │
├────────────┤
│ KR1533TM2 │ The microcircuits can be taken from other
│ KR1533LI1 │ goy series, for example, 555.
│ KR1533LL1 │
├────────────┤
│ Resistors  │
├────────────┤
│  10 KOhm   │ It is best to take resistors
│  300 Ohm   │ small, for example, 0.125
├────────────┤ or 0.25 W.
│ LED  │ LED can be taken from another
├────────────┤ suitable, but this one is
│AL307a,b,c,d│ the cheapest.
├────────────┤
│  Button   │ Button, in principle, any without
├────────────┤ fixations, i.e. you press -
│ MP3-1, MP9 │ there is contact, let go-
└────────────┘ контакта нет.


             Схема:
                                       300 Ом    светодиод
                                  ┌─────▒▒▒────────┤>├────┐
                                  │                      ─┴─
                                  │     к дорожке 1[DD47](DD49)
┌───────╦────────────╦─────>+5v   │ ┌──────────────────────────>
│       │            │            │ │       ЛИ1
│       │    TM2     │     TM2    │ │      ┌───┐       к ноге
│ 10КОм │  ┌─┬─┬─┐   │   ┌─┬─┬─┐  │ ╠─────1┤&  │   1[DD47](DD49)
│  ┌▒▒▒─╩─4┤S│ │ │   └─10┤S│ │ │  │ │      │   ├3──────────────>
│  │       ├─┤ │Q├5─     ├─┤ │Q├9─┘ │   ┌─2┤   │
│  ╠──────2┤D│ │ │   ┌─12┤D│ │ │    │   │  └───┘│  │  KC-  │ │ │ │   │   │ │ │ │    │   │   ЛЛ1
│   <────3┤C│ │_│ ┌─┼─11┤C│ │_│    │   │  ┌───┐
│         ├─┤ │Q├6┘ │   ├─┤ │Q├8─╦─┼───╩─2┤1  │
│  │   ┌──1┤R│ │ │ ┌─┼─13┤R│ │ │  │ │      │   ├3─┐
│ ─┴─  │   └─┴─┴─┘ │ │   └─┴─┴─┘  │ │ ┌───1┤   │  │
│      │           │ └────────────┘ │ │    └───┘  │
└──────┘      ЛИ1  │                │ │ ┌─────────┘
 NMI-        ┌───┐ │                │ │ │   ЛИ1
<──────────10┤&  │ │                │ │ │  ┌───┐
             │   ├8┘                │ │ └─4┤&  │  15[DD45](DD52)
          ┌─9┤   │                  │ │    │   ├6──────────────>
          │  └───┘                  │ │ ┌─5┤   │
          └─────────────────────────┘ │ │  └───┘13[DD52](DD53)
 │ └──────────────────────>
 │ 15[DD52](DD53)
 └────────────────────────>

   IMPORTANT NOTE: in square brackets
chip numbers for the new one are indicated
boards (TURBO+), in round ones for the old board
(released before April 1996).

 How the circuit works.

   The circuit operates on the one-bit principle
counter, i.e. one press on the microphone turns on
turns it on, and the other turns it off, etc. Slightly
Further details for the picky: inclusion
diagram occurs immediately after clicking on
Mikrik and with the arrival of personnel synchro-
pulse, i.e. after pressing the microphone, trigger-
ger waits for the start of drawing a new frame and
only then does it turn on. Therefore, if you
by some miracle you manage to press and release -
Press the button between drawing the current and
next frame of the screen, then the circuit does not work
nerds. But you're so quick to press the button
It’s unlikely you can :-) Shutdown occurs
also. As in the previous diagram, port #1FFD
automatically unlocks when pressed
to MAGIC or RESET.

   The following information is only for those who have
there is already a revision.

   The circuit uses the other half
trigger TM2,which was previously unused
called. Unsolder everything that goes to the feet of the microphone
circuitsTM2,except for legs7,8,13,14 (they are not
touch!!!). Further according to the diagram. Resistor on
10K and 300 Ohm need to be taken from the old circuit
(they were soldered to the base of the transistor and
LED). The signal KS- is taken from the system
connector: 22th contact from the bottom. But the beam
best with12-th DD42 legs (for TUR-board
BO+), because no need to pull the wire all the way
fee. By system connector I mean-
I mean the one to which power is supplied,
monitor, tape recorder, etc. Although instead of KS-
you can use any signal that
constantly changes its state from log.0 to
log.1, etc., at least 1/50 of a second (e.g.
INT-). It would be possible to get by altogetherwithout
all sorts ofKS-,for example, assemble a trigger
on the left according to the standard one-shot circuit,
but this would require more condensation
a torus of several nanofarads, a diode KD522  and
resistor If you don't mind the extra
details, I present the modified part of the diagram.

 mikrik
 /
 ┌───/ ──┐
 ─┴─ │ TM2
 3KOhm │ ┌─┬─┬─┐
+5v<────▒▒▒─╩─4┤S│ │ │ to the 11th leg of TM2
 ├─┤ │Q├5───────────────>
 ┌───╦──╦─2┤D│ │ │
 │ │ │ │ │ │ │
 ─┴─ │ └─3┤C│ │_│
 │ ├─┤ │Q├6─┐
 ─┴─ ┌─1┤R│ │ │ │
 47nf ─┬─ │ └─┴─┴─┘ │
 │ │ KD522 │
 └──╬────┤<├────╣
 │ 1.5KOhm │
 └────▒▒▒────┘

   The diode can be KD521 or KD510,but
the capacitor terminal can also be changed
by 75%.
 But I still recommend the first option
schemes, because it requires fewer parts. I
I tried both options, but still stopped
on the first, he plows like a beast.

   The general conclusion speaks in favor of the new
revision schemes #1FFD ON/OFF: firstly,
no new parts for this modification
not required; secondly, in the end there should be
there are extra ones: a resistor of 1K and a transistor
KT315,which can be used in the future
use at your own discretion, and thirdly
them: this scheme brings more benefits,
than old! The only downside: you have to
still spend a few centimeters
wires

   Information for those who do not have modifications
ki according to the scheme from ZX FORMAT'a.

   If you are not very good at
electronics, then it’s better not to climb into
board, computer - a complex thing, still open
If you don’t give him his head, what will you do then?
It’s better to ask knowledgeable people about this,
I bet they'll do everything for you for half a liter
necessary, unless, of course, they accept these terms
-liter inside before...
   So, first, find the mic on the board.
schematic [DD47](DD49) this is TM9 and carefully
remove1th leg from the track (without disturbing the
my path!!!), and bend it (leg). Pe-
cut the path between 13-th leg [DD52]
(DD53) this is ID7, and 15th foot [DD45](DD52)
this is KP12. That's it, no need to cut the board anymore.
   Next, solder according to the diagram. And don't forget to
supply +5V to all14-legs, and to all
7-th general. And another good piece of advice, because... 2-s
the legs of the microcircuits LI1 and LL1 are connected, yes
and 7-s and14-s too, then the chip LL1 beam
Place it above LI1, so all the modification
will take up less free space
mounting field. It is better to take thin wires
and soft, so it’s easier to solder. I don't think it's necessary
explain that the shorter the wire, the better
she. All the best to you, see you soon.

                Cardinal/PGC/BDA
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