ZX-News #15 19 ноября 1996

Железо

Iron - Connection Hays-compatible modem to the Scorpio.

                 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 ...


       __________________________