Miracle #03 16 июля 1999

Железо

Myself - Modems: Diagrams, charts! Scheme G. Shepeleva Kondratiev and M. Hayes modem connection.

    (C) Darth Vader / Triumph

    -----------------------

    Consider the 'railroad' to connect the inner side HAYES - 
the modem to Speccy. Due to the fact that the authors of these 
letters do not pointed out that reprinting in magazines banned, 
I allow myself quote here the schema. Yes, and I would not want 
to make the people they sought with such same difficulties as 
me. 


    So, here we go:
---------------------------------------
  Wiring diagram domestic HAYES

                 modem.
(Reproduced with modifications)

           Copyright G. Shepelev


    from the computer contacts the slot modem:


     DATA 0-7 A9-A2 DATA 0-7


        A15 555LL1

                     1

                             1 A22, A23 A9, A8

        A14 O

                                             A24, A25 A7, A6

      A13, A12 10k

                                +5 V  IORD (B14)

     RD 1> IOWR (B13)

           LL1 November 13

         March 1 ___

     A4 1 |___|> IORQ4 (B24)

    ____ 2 LL1 LA3

    IORQ June 4 e 4

                   1 TM2 '6

     __ 5 1 5 o

     WR +5 B> oR 6

                     2 o

    A11 D

                             March 1 LP8

                              / C o 3

    ___ 4 5 2

    RES oS

                                e

                                        5 LP8

              LA3 +5> e 6

            4 ___ 4

              '6 |___| o

            5 o LP8


                                       12

                                             11

     __ 13

     M1 o


     D1

    ___

    INT

                                           > RESET (B2)


    +5 B>> to vyv.14 chips LL1, LA3, TM2, LP8


            > To vyv.7 chips LL1, LA3, TM2, LP8

       e

Note: In brackets are indicated rates

            contacts on the modem board.

            Signals connected to the left

            Speccy, and the right to the modem.

Products: 555LL1

            555LA3

            555TM2

            555LP8

Resistors: 1k
-+-------------------------------------
      Refinement scheme Spectrum


                   Z80

      cut

                ___

           x INT
 ___
|___|
/

    add

                   ___

                  > INT

Note: Resistor 560 Ohm.
-+-------------------------------------
     Wiring diagram for Spectrum'u


      SystemModem

       port

     _______________

    | A 8 |----> | a31 | A 0 |

    | A 9 |----> | a30 | A 1 |

    | A10 |----> | a29 | A 2 |

    | D 0 |----> | a9 | D 0 |

    | D 1 |----> | a8 | D 1 |

    | D 2 |----> | a7 | D 2 |

    | D 3 |----> | a6 | D 3 |

    | D 4 |----> | a5 | D 4 |

    | D 5 |----> | a4 | D 5 |

    | D 6 |----> | a3 | D 6 |

    | D 7 |----> | a2 | D 7 |

    | | | A28 | A 3 | -

    | | | A27 | A 4 | AT

    | | | A26 | A 5 | +5 v

    | | | A25 | A 6 | a

    | | | A24 | A 7 | 3-10k

    | | | A23 | A 8 |

    | | | A22 | A 9 | -

    | | | A21 | A10 | - on the ground

    | | | A11 | AEN | - on the ground

    | | | B9 | +12 v | to the corresponding IP
    | | | B7 |-12v |> source of stress

    | | | B |-5v | / modem if required

    | GND |----> | b1 | GND |

    | GND |----> | b31 | GND |

    | +5 V |----> | b3 | +5 v |

    | RESET | - by - | b2 | RESET |

    | RD | - | b13 | IOWR |

    | A4 | - n | b14 | IORD |

    | IORQ | - L | b24 | IORQ4 |

    | WR | - a | | |

    | A11 | - T | | |

    | INT | - y | | |

    | _D1__ | - |__________|

     signal signal
-+------------------------------------- Difference between the 
scheme of the prototype method of issuing interrupts to the 
computer. Because possible alter ROMs have

nebylo, we decided to use a conventional
INT, rather than NMI. Interrupt Handling
made in the mode of IM2. Must
noted that the issue of termination on
computer from the modem is accompanied by
change the interrupt vector, which is easily
tracked mode IM2. Thus
retained the ability to work with
interrupts coming from the computer.
No other differences and programs that
do not use the interrupt from the modem
the same will work on any version of
scheme.
=== Cut ===
****************************************


    Personally, I plugged the modem in the first
scheme (Shepeleva) because while the other
did not. Seems to work is not bad
Although people disliked this scheme,
prefer Kondratieff. There is also talk that it is obligatory to 
fast modems with buffering scheme Kondratiev, besides new 
terminalka (Judging by the reviews pretty cool)

only works with this scheme! In general,
Choose ...


    And finally, some words about
nutrition. If you have pC'shny block
nutrition, problemma not arise - there
has all the right voltage. Otherwise
event will gather a small
shemku, forming voltage-5V and
-12V. This scheme leads to the Journal
"OBERON # 5." If you do not have it, do not
discouraged scheme elementary, its
can make any beginner: transformer, diode bridge, 3 capacitors
and 2 KREN'ki - stabilizers negative voltages. ABOVE ALL, do 
not forget connect the common wire of this unit

power to that already feeds your
computer!


    By the way, look at the modem connector
maybe you will not need to do
additional power supply.


                 Good luck!

 Sincerely, Darth Vader / Orion / Triumph