Iron
As promised, we bring to your attention an article about the
connection hayes-compatible modem to Zx-Spectrum.
We searched for searched the man who we
it in the newspaper writes, and he found us.:)
For that he thanks a lot.
And yet - a big request to the authors of articles,
especially those which provide any scheme. Remember that in
ZxNews only one output driver
Text - 42 characters per line. And when we
obtain a scheme that takes all the 64 characters, a slight
problem ...
(C) Igor Gruzdev
Hello, ZX-Spectrum fan's!
When the lion cage
says "Jackass" - not
believe your eyes.
(Prutkov)
I, as one of the initiators (not true
Do a little immodest, but I hope you
forgive me) movement in the FIDO with Spectrum on a normal
Hayes compatible modem has recently been much surprised. And
that's what.
As I learned in the Petersburg Spectrum
Traffic there is a perception that the combination of
Spectrum + modem is possible only if ZS-256. And this view will
strengthen further and after in the market for sale there
developed by Scorpion at the direction of Mr. Zonova controller
hard drive and a slot to connect an external periphery that is
compatible with ibm'noy technique. A Why, you ask, the
Pentagon, Leningrad, Kai?
Let's leave aside questions of the connection
Winchester and blaster to _not_ Scorpion
aside and consider the most urgent
problem - what if someone wanted to connect the internal modem
for 2400 (And maybe more) and enjoy the vast and interesting
possibilities organization Fidonet, if there is only the
Pentagon 128?
I'll give the answer - take a soldering iron in hand and
connect. And be thankful if you have the Pentagon, because the
scheme will be just slightly shorter than the Scorpio, because
they do not required to block additional ports
(Skorpionovsy inheritance) does not have to worry about
subsequent work button Magik.
Although, for especially love this "device"
possible and implement the work of the buttons on the Magic
Pentagon, but who uses it?
Thus, we consider the wiring diagram of Hayes to Scorpio.
(Although this name modem is not quite true, correct we would
have to say, "Hayes-compatible modem, but to save will take
place this terminology)
Scheme as amended by Boris Sokol,
copyright on circuit solution
belongs to Michael Kondratyev
(2:5030 / 362.1).
Board approval Modem Scorpion'om
(Figure 1)
B18/RD LL1 12> IOR/B14
> 1> IOW/B13
November 13
A24/A4 September 8
> 1
B17/IORQ 10 LL1
> March 1
1 TM2
B19/WR LL1 February 1
> Or
A28/A11 May 2
> D
3
/ C
A20/RESET 4
> OS
1 o> RESET/B2
April 3
> IORQ4/B24
LN1 1
1 o
LN1 2
4
6 LL1
May 1
b23/NMI>
> - Contact number on the system bus /
/ Signal name
-> Name of the signal / modem raz'ei
Products: 555LL1, 555LN1, 555TM2
Conclusion: 7 - Land
Circuits: 14 - + 5 v
capacitors connected:
to 7 and 14 feet LL1 m TM2
on the +12 v modem capacity: 0,01-0,1 yF
-----------------------------------------
Refinement scheme SCORPIO
cut
\ 6 D55
> X
3
1
A4
> 2
to Z80 DD 555LI1
(Figure 2)
cut 34
\ 1917 -> A4 m / s 555LI1
> X solder on the following
6 Z80 pyshe, next to
4 System
raz'emom
<5
NMI/b23
on the system connector
(Figure 3)
-----------------------------------------
scorpion modem
A 8 b26 ----> a31 A 0
A 9 a27 ----> a30 A 1
A10 b27 ----> a29 A 2
D 0 b6 ----> a9 D 0
D 1 b7 ----> a8 D 1
D 2 b8 ----> a7 D 2
D 3 b11 ----> a6 D 3
D 4 b12 ----> a5 D 4
D 5 b10 ----> a4 D 5
D 6 b9 ----> a3 D 6
D 7 b3 ----> a2 D 7
a28 A 3 -
a27 A 4 IN
a26 A 5 +5 v
a25 A 6 through
a24 A March 7-10k
a23 A 8
a22 A 9
a21 A10 -
a11 AEN to the ground
+5 V a3 ----> b3 +5 v
-> +12 V a17 ----> b9 +12 v
->-12v a14 ----> b7-12v
->-5V a16 ----> b5-5v
GND a30 ----> b1 GND
GND b30 ----> b31 GND
RESET a20 - on
RD b18 -
A4 a24 - n
IORQ b17 - l - b2 RESET
WR b19 - a - b14 IOR
A11 a28 - r - b13 IOW
-> NMI b23 - y - b24 IORQ4
signal signal
---> To bring the signal to
sistemnyyu shiny
Cable that connects the system connector
Scorpion with board approval from her pocket sealed connector
modem (slot), should be no longer than 25 cm
So, what do we see? Do not be afraid,
if it is written, saying the scheme matching the modem and the
Scorpion. The fact that no Scorpio circuit shown in Figure 2
collect do not need. A revision is indicated in Figure 3, that
worked underground service monitor. If you want on your button
and the Pentagon worked Magik, you have to make this revision.
But, as I think magico already long ago no one uses it and his
loss for not skorpionschikov will be small. Look at scheme. Pay
attention to the input and output signals. Nothing but
skorpionovskogo you will not see. The same conventional signals
Spectrum.
Top-down:
/ RD - 21 output Z80
A4 - 34 output Z80
/ IORQ - 20-pin Z80
/ WR - 22 output Z80
A11 - 7 output Z80
/ Reset - 26 output Z80
/ NMI - 17 output Z80
Oh yeah ... Remains an open question about ROM flashing ..
With that little bit more complicated. But if there is someone
with a programmer who can reflash from 27512 Pentagon firmware
on it the same, but with corrected byte in BASIC-48, ie,
judging by the three-volume ZX-Revue 'assembler programming',
p.108, third paragraph above: "... to correct the error in
standard program. To do this, at 006DH replace the code 020H
(JP NZ,) to code 028H (JP Z, )..." Then
you already no that did not stop to connect the modem to his
Pentagon or Leningrad. Be of good cheer and see you at the vast
expanses of the computer world called FidoNet.
With all kinds of regard'ami and wishes'ami.
Igor.
P.S. If you still doubt that
Pentagon + modem is not possible, room
filamentary, author of the scheme, the one who first
internal modem connected to your
computer, too, had only
Pentagon-128 ...
Editorial Note: wiring diagram for Scorpio can simplify ...
(C), Alexander Mayorov
Instead of the scheme in Figure 3:
6-th output 555LL1 (on the controller modem)
served on the contact system b14/MNI
raz'ema through resistor 300 ... 600 ohms.
Instead of the scheme in Figure 2:
on the controller card is still treated in a
m / s: 555LP8
March 1
A4> O> a13/IORQCE
on the system
+5 V raz'eme
2
But other elements can be used
as inverters instead of m / 555LN1, and the very
555LN1 can remove ...
__________________________
