Betreten der Baustelle auf eigene Gefahr!

Sysops haften für ihre User ;-)
10.3  Gängige Computersteckverbindungen

10.3.1 Netzteilstecker

Typische Netzteile haben 6 Stecker raushängen: 2 Stück zu je 6 pins
für das Motherboard und 4 Stück zu je 4 pins für Festplatten, Disketten-
laufwerke etc.


Motherboard-Stecker
     P8                                 P9
    Pin    Signal                      Pin    Signal
-----------------------------      ---------------------------
     1  -  Power Good                   1  -  GND
     2  -  +5v  (or N.C.)               2  -  GND
     3  -  +12v                         3  -  -5v
     4  -  -12v                         4  -  +5v
     5  -  GND                          5  -  +5v
     6  -  GND                          6  -  +5v


Festplattenstecker

    Pin    Signal
-----------------------------
     1  -  +12v
     2  -  GND
     3  -  GND
     4  -  +5v


10.3.2 16-bit AT-Slots

COMPONENT SIDE                     NON-COMPONENT SIDE

Pin  Signal                        Pin  Signal
---------------                    ---------------
C1   SBHE                          D1   -MEM CS16
C2   LA23                          D2   -I/O CS16
C3   LA22                          D3   IRQ10
C4   LA21                          D4   IRQ11
C5   LA20                          D5   IRQ12
C6   LA19                          D6   IRQ15 (!)
C7   LA18                          D7   IRQ14
C8   LA17                          D8   -DACK0
C9   -MEMR                         D9   DRQ0
C10  -MEMW                         D10  -DACK5
C11  SD08                          D11  DRQ5
C12  SD09                          D12  -DACK6
C13  SD10                          D13  DRQ6
C14  SD11                          D14  -DACK7
C15  SD12                          D15  DRQ7
C16  SD13                          D16  +5v
C17  SD14                          D17  -MASTER
C18  SD15                          D18  GND

10.3.3 Parallele Druckerschnittstelle (Centronics)

     I/O Mapping
--------------------------
     LPT1:     $378-37A
     LPT2:     $278-27A

DB-25 Connector (Computer End)

    Pin   Signal                        Pin  Signal
-------------------------------------------------------------------
     1    STROBE                        14   Auto Feed
     2    Data Bit 0                    15   *Error
     3    Data Bit 1                    16   *Initialize Printer
     4    Data Bit 2                    17   *Select Input
     5    Data Bit 3                    18   GND
     6    Data Bit 4                    19   GND
     7    Data Bit 5                    20   GND
     8    Data Bit 6                    21   GND
     9    Data Bit 7                    22   GND
    10    *Acknowledge                  23   GND
    11    Busy                          24   GND
    12    Paper Out                     25   GND
    13    Select


Centronics 36 pin Connector (Printer End)

    Pin   Signal                        Pin  Signal
-------------------------------------------------------------------
     1    *STROBE                       19   GND
     2    Data Bit 0                    20   GND
     3    Data Bit 1                    21   GND
     4    Data Bit 2                    22   GND
     5    Data Bit 3                    23   GND
     6    Data Bit 4                    24   GND
     7    Data Bit 5                    25   GND
     8    Data Bit 6                    26   GND
     9    Data Bit 7                    27   GND
    10    *Acknowledge                  28   GND
    11    Busy                          29   GND
    12    Paper Out                     30   GND
    13    Select                        31   *Prime
    14    Auto Feed XT                  32   Error
    15    {OSCXT}                       33   Signal GND
    16    Signal GND                    34   N/C
    17    Frame GND                     35   N/C
    18    +5v                           36   N/C

Mit DOS V 6.0 (and Central Point Software's PCTools 8.0 w/ Drive Map 1.0)
wurde die Möglichkeit eigeführt, zwei PCs über ein paralleles Kabel zu ver-
binden, um Fesplattenlaufwerke von beiden Rechnern aus benutzen zu können.
Die Belegung des notwendigen "LINK DOS 6.0" Kabels ist wie folgt:

        |--COMPUTER 1--|         |--COMPUTER 2--|
             DB25M                    DB25M
      pin     2 - - - - - - - - - - - - 15
              3 - - - - - - - - - - - - 13
              4 - - - - - - - - - - - - 12
              5 - - - - - - - - - - - - 10
              6 - - - - - - - - - - - - 11
              10- - - - - - - - - - - - 5
              11- - - - - - - - - - - - 6
              12- - - - - - - - - - - - 4
              13- - - - - - - - - - - - 3
              15- - - - - - - - - - - - 2


10.3.4 Tastatur- und Joystickanschlüsse

PS/2-Tastatur (5pin-Mini-DIN)

 6pin DIN Male
     --+--
    / 5+6 \
   | 3   4 |
    \ 1 2 /
     -----

	Pin      Signal
-----------------------------
	 1       +KBD data
	 2       Reserved
	 3       Ground
	 4       +5 Vdc
	 5       +KBD clk
	 6       Reserved
	 Shield  Frame ground

AT-Tastatur (5pin-DIN)

    Pin    Signal
-----------------------------
     1  -  KBD CLK OUT
     2  -  KBD SERIAL OUT
     3  -  KBD RESET IN
     4  -  KBD GND
     5  -  KBD +5v
     
GAME CONNECTOR (DB-15)

    Pin   Signal                   Pin  Signal
-------------------------------------------------------------------
     1    +5v                       9   +5v
     2    Button 1-1               10   Button 2-1
     3    X1                       11   X2
     4    GND                      12   GND
     5    GND                      13   Y2
     6    Y1                       14   Button 2-2
     7    Button 1-2               15   N/C
     8    N/C
 

     Buttons - Connect from GND to Button inputs
     X and Y pots connect from +5v to X-Y inputs.


JOYSTICK CONNECTOR

DB-9 Connector

    Pin   Signal                   Pin  Signal
-------------------------------------------------------------------
     1    JOY0                      6   Fire Button
     2    JOY1                      7   +5v
     3    JOY2                      8   GND
     4    JOY3                      9   POT X
     5    POT Y

_______________________________________________________________________________

10.3.5 Diskettenlaufwerk (Shugart-Bus)

    Pin    Signal        Pin    Signal
-------------------------------------------------------------
     1  -  GND            2  -  N/C
     3  -  GND            4  -  N/C
     5  -  GND            6  -  N/C
     7  -  GND            8  -  Index
     9  -  GND           10  -  Motor Enable A
    11  -  GND           12  -  Drive Select B
    13  -  GND           14  -  Drive Select A
    15  -  GND           16  -  Motor Enable B
    17  -  GND           18  -  Stepper Direction
    19  -  GND           20  -  Step Pulse
    21  -  GND           22  -  Write Data
    23  -  GND           24  -  Write Enable
    25  -  GND           26  -  Track 0
    27  -  GND           28  -  Write Protect
    29  -  GND           30  -  Read Data
    31  -  GND           32  -  Select Head 1
    33  -  GND           34  -  (Spare)


10.3.6 Festplattenschnittstellen

ESDI-Control Cable

    Pin    Signal                  Pin    Signal
-------------------------------------------------------------
     1  -  Head Select 3           2  -  GND
     3  -  Head Select 2           4  -  GND
     5  -  Write Gate              6  -  GND
     7  -  Config/Status Data      8  -  GND
     9  -  Transfer Ack.          10  -  GND
    11  -  Attention              12  -  GND
    13  -  Head Select 0          14  -  GND
    15  -  Sec/Addr Mark Find     16  -  GND
    17  -  Head Select 1          18  -  GND
    19  -  Index                  20  -  GND
    21  -  Ready                  22  -  GND
    23  -  Transfer Request       24  -  GND
    25  -  Drive Select 1         26  -  GND
    27  -  Drive Select 2         28  -  GND
    29  -  Drive Select 3         30  -  GND
    31  -  Read Gate              32  -  GND
    33  -  Command Data           34  -  GND

ESDI-Data Cable

    Pin    Signal                  Pin    Signal
-------------------------------------------------------------
     1  -  Drive Selected          2  -  Sec/Addr Mark Found
     3  -  Seek Completed          4  -  Address Mark Enable
     5  -  Reserved/Step Mode      6  -  GND
     7  -  Write Clock+            8  -  Write Clock-
     9  -  Cartridge Changed      10  -  Read Ref. Clock+
    11  -  Read Ref. Clock-       12  -  GND
    13  -  NRZ Write Data+        14  -  NRZ Write Data-
    15  -  GND                    16  -  GND
    17  -  NRZ Read Data+         18  -  NRZ Read Data-
    19  -  GND                    20  -  Index
    
    
AT-Bus Interface (IDE)

           2,5" Platten                 3,5" - und 5.25" - Platten
          Rastermaß 2 mm                    Rastermaß 2,54 mm
 (die Stecker gibt's bei Farnell)

            NC  o o  NC
         SLAVE  o o  NC

                1 2 Pin                             1 2 Pin
   /HOST RESET  o o  GND               /HOST RESET  o o  GND
   HOST DATA 7  o o  HOST DATA 8       HOST DATA 7  o o  HOST DATA 8
   HOST DATA 6  o o  HOST DATA 9       HOST DATA 6  o o  HOST DATA 9
   HOST DATA 5  o o  HOST DATA 10      HOST DATA 5  o o  HOST DATA 10
   HOST DATA 4  o o  HOST DATA 11      HOST DATA 4  o o  HOST DATA 11
   HOST DATA 3  o o  HOST DATA 12      HOST DATA 3  o o  HOST DATA 12
   HOST DATA 2  o o  HOST DATA 13      HOST DATA 2  o o  HOST DATA 13
   HOST DATA 1  o o  HOST DATA 14      HOST DATA 1  o o  HOST DATA 14
   HOST DATA 0  o o  HOST DATA 15      HOST DATA 0  o o  HOST DATA 15
           gnd  o o                            gnd  o o
       IOCHRDY  o o  GND                   IOCHRDY  o o  GND
         /HIOW  o o  GND                     /HIOW  o o  GND
         /HIOR  o o  GND                     /HIOR  o o  GND
          DACK  o o  Reserved                 DACK  o o  Reserved
           DRQ  o o  GND                       DRQ  o o  GND
        IRQ 14  o o  /Host IO/16            IRQ 14  o o  /Host IO/16
   HOST ADDR 1  o o  /PDIAG            HOST ADDR 1  o o  /PDIAG
   HOST ADDR 0  o o  HOST ADDR 2       HOST ADDR 0  o o  HOST ADDR 2
     /HOST CS0  o o  /HOST CSI           /HOST CS0  o o  /HOST CSI
         /DASP  o o  GND                     /DASP  o o  GND
     +5V LOGIC  o o  +5V MOTOR                     39 40 Pin
           GND  o o  XT/AT
               43 44 Pin

10.3.7 SCSI-Schnittstellen

SCSI-Belegung single-ended (3,5" und 5,25")

    Pin    Signal        Pin    Signal
-------------------------------------------------------------
     1  -  GND            2  -  Data Line 0
     3  -  GND            4  -  Data Line 1
     5  -  GND            6  -  Data Line 2
     7  -  GND            8  -  Data Line 3
     9  -  GND           10  -  Data Line 4
    11  -  GND           12  -  Data Line 5
    13  -  GND           14  -  Data Line 6
    15  -  GND           16  -  Data Line 7
    17  -  GND           18  -  Data Parity Line
    19  -  GND           20  -  GND
    21  -  GND           22  -  GND
    23  -  GND           24  -  GND
    25  -  N/C           26  -  Terminator Power
    27  -  GND           28  -  GND
    29  -  GND           30  -  GND
    31  -  GND           32  -  Attention
    33  -  GND           34  -  GND
    35  -  GND           36  -  Busy
    37  -  GND           38  -  Acknowledge
    39  -  GND           40  -  Reset
    41  -  GND           42  -  Message
    43  -  GND           44  -  Select
    45  -  GND           46  -  C/D
    47  -  GND           48  -  Request
    49  -  GND           50  -  I/O

SCSI-Belegung (2,5") 
 
  39 ...                         ... 5 3 1   7 5 3 1
 +-----------------------------------------+---------+
 | o o o o o o o o o o o o o o o o o o o o | o o o o |
 | o o o o o o o o o o o o o o o o o o o o | o o o o |
 +-----------------------------------------+---------+
  40 ...                         ... 6 4 2   8 6 4 2
 
 \_______________ SCSI-Bus _______________/ \_ ID __/
                                             - A A A
                                               2 1 0
 Pin    Signal          Pin     Signal
 
 1,2    +5V (Power)     25      /ATN
 3,4    GND (Power)     26      /BSY
 5,7,                   28      /ACK
 9,11,                  29      /RST
 13,15,                 30      /MSG
 19,21,                 32      /SEL
 23,27,                 33      IO
 31,35  GND (SCSI)      34      CD
 6      DB0            36      REQ
 8      /DB1            37,38   GND (Motor)
 10     /DB2            39,40   +5V (Motor)
 12     /DB3
 14     /DB4
 16     /DB5
 17     NC
 18     /DB6
 20     /DB7
 22     /PARITY
 24     TERMPWR
 
 SCSI-ID    A0      A1      A2
 
 0          High    High    High
 1          Low     High    High
 2          High    Low     High
 3          Low     Low     High
 4          High    High    Low
 5          Low     High    Low
 6          High    Low     Low
 7          Low     Low     Low

Pinbelegung, für SCSI-Schnittstelle an 25 poligem Sub-D-Stecker (Apple-Norm):

 1 /REQ   2 /MSG   3 /I/O   4 /RST   5 /ACK   6 /BSY   7 GND    8 /DB0
 9 GND   10 /DB3  11 /DB5  12 /DB6  13 /DB7  14 GND   15 /C/D  16 GND
17 /ATN  18 GND   19 /SEL  20 /DBP  21 /DB1  22 /DB2  23 /DB4  24 GND
25 TPWR

Beim Macintosh Plus ist die TERMPWR-Leitung nicht belegt. Eins der SCSI-
Devices muß hier die Spannung für die Abschlußwiderstände liefern.


10.3.8 Bildschirmanschlüsse

Monochrome (MDA), Hercules, Color (CGA) Adaptors
     Connector type - DB-9

    Pin   Signal              Pin  Signal
-------------------------------------------------------------------
     1    GND                  6   Intensity
     2    GND                  7   Video *
     3    N/C or RED           8   Horizontal Drive
     4    N/C or GREEN         9   Vertical Drive
     5    N/C or BLUE

     * NTSC Video on some clone boards


EGA Adaptor
     Connector Type - DB-9

    Pin   Signal              Pin  Signal
-------------------------------------------------------------------
     1    GND                  6   Secondary Green / Intensity
     2    Secondary Red        7   Secondary Blue / Mono Video
     3    Primary Red          8   Horizontal Drive
     4    Primary Green        9   Vertical Drive
     5    Primary Blue

VGA Adaptor
     Connector Type - DB-15
		   1  2  3  4  5
		 6  7  8  9  10
		  11 12 13 14 15

    Pin   Signal                   Pin  Signal
-------------------------------------------------------------------
     1    Red Video                 9   [KEY]
     2    Green Video              10   Sync GND
     3    Blue Video               11   Monitor ID - Bit 1
     4  -  Monitor ID - Bit 2      12   Monitor ID - Bit 0
     5  -  GND                     13   Horizontal Sync
     6  -  Red GND                 14   Vertical Sync
     7  -  Green GND               15   N/C (Reserved)
     8  -  Blue GND


Belegung der Video/Audio-8-pin-DIN-Buchse beim C-64:
 
                  **                1   Luminance
              o8      o7            2   GND
                  o6                3   Audio out
             o1        o3           4   Composite video out
              o4      o5            5   Audio in
                  o2                6   Chrominance
                                    7   NC
                                    8   NC

Belegung der ATARI-Monitor-Buchse:

			  4  3  2  1            4   Monochrom Detect (auf Signal GND)
			  8  7  6  5            9   Horizontal Sync
			 12 11 10  9           11   Monochrom Video
			     13                12   Vertical Sync
                                   13   Signal GND

_______________________________________________________________________________

10.3.9 Serielle Schnittstellen

(Die folgenden Texte sind zum Teil Englisch, wenn ich mal Zeit habe, über-
setze ich sie noch, Freiwillige dürfen sich natürlich auch gern melden)

          I/O Map
-----------------------------
     COM1:     $3F8-3FF
     COM2:     $2F8-2FF
     COM3:     $3E8-3EF
     COM4:     $2E8-2EF

DB-9 Connector

    Pin   Signal                   Pin  Signal
-------------------------------------------------------------------
     1    CD   Carrier Detect       6   DSR  Data Set Ready
     2    RXD  Receive Data         7   RTS  Request to Send
     3    TXD  Transmit Data        8   CTS  Clear to Send
     4    DTR  Data Term. Ready     9   RI   Ring Indicator
     5    GND  Signal GND

DB-25 Connector

    Pin   Signal                   Pin  Signal
-------------------------------------------------------------------
     1    GND  Ground / Shield     14        {2nd TXD}
     2    TXD  Transmit Data       15        Transmit Clock
     3    RXD  Received Data       16        {2nd Rec. Clock}
     4    RTS  Request to Send     17        {Receive Clock}
     5    CTS  Clear to Send       18        {Unassigned}
     6    DSR  Data Set Ready      19        {2nd RTS}
     7    GND  Ground              20   DTR  Data Term Ready
     8    DCD  Carrier Detect      21        {Sig. Quality}
     9         {Reserved}          22   RI   Ring Indicator
    10         {Reserved}          23        {Data Rate Sel.}
    11         {Unassigned}        24        {Transmit Clock}
    12         {2nd CD}            25        {Unassigned}
    13         {2nd CTS}


Nullmodemkabel

RS-232 Definition        Computer/Terminal        Modem
     Signal                     DTE                DCE
                         9-pin      25-pin        25-pin
-------------------------------------------------------------------
GND  Signal GND            5          7             7
TXD  Transmit Data         3          2             3
RXD  Receive Data          2          3             2
RTS  Req. to Send          7          4             5
CTS  Clear to Send         8          5             4
DSR  Data Set Ready        6          6             20
GND  Chassis GND           -          1             1
CD   Carrier Detect        1          8             8
DTR  Data Term. Ready      4          20            6

Null modem cables (Several variations)

        |--COMPUTER 1--|         |--COMPUTER 2--|
         DB9F or   DB25F          DB25F or   DB9F
      pin 2 - - - - 3 - - - - - - - 2 - - - - 3   \ transmit &
          3 - - - - 2 - - - - - - - 3 - - - - 2   / receive data
          5 - - - - 7 - - - - - - - 7 - - - - 5   - signal ground

      pin 4 - - - - 20  - - - - - - 6 - - - - 6 * \
          6 - - - - 6 - - - - - - - 20  - - - 4 *  \handshaking (optional)
          7 - - - - 4 - - - - - - - 5 - - - - 8    /(* required for ZIPDUP)
          8 - - - - 5 - - - - - - - 4 - - - - 7   /

        |--COMPUTER 1--|         |--COMPUTER 2--|
         DB9F or   DB25F          DB25F or   DB9F
      pin   - - - - 1 - - - - - - - 1 - - - -
          3 - - - - 2 - - - - - - - 3 - - - - 2
          2 - - - - 3 - - - - - - - 2 - - - - 3
          7 - - - - 4 - - - - - - - 5 - - - - 8
          8 - - - - 5 - - - - - - - 4 - - - - 7
          6 - - - - 6 - - - - - - - 20- - - - 4 (As you can see here, pins
          1 - - - - 8 - - - - - - - 20- - - - 4 6 & 8 are jumped together
          4 - - - - 20- - - - - - - 6 - - - - 6 and join the 20 on the
          4 - - - - 20- - - - - - - 8 - - - - 1 other end (both ways)).

         |--COMPUTER 1--|         |--COMPUTER 2--|
         DB9F or   DB25F          DB25F or   DB9F
      pin   - - - - 1 - - - - - - - 1 - - - -
          3 - - - - 2 - - - - - - - 3 - - - - 2
          2 - - - - 3 - - - - - - - 2 - - - - 3
          8 - - - - 5 - - - - - - - 20- - - - 4 (As you can see here, pins
          6 - - - - 6 - - - - - - - 20- - - - 4 5, 6 & 8 are jumped together
          1 - - - - 8 - - - - - - - 20- - - - 4 and join the 20 on the
          4 - - - - 20- - - - - - - 5 - - - - 8 other end (both ways)).
          4 - - - - 20- - - - - - - 6 - - - - 6
          4 - - - - 20- - - - - - - 8 - - - - 1

         |--COMPUTER 1--|         |--COMPUTER 2--|
         DB9F or   DB25F          DB25F or   DB9F
      pin   - - - - 1 - - - - - - - 1 - - - -
          3 - - - - 2 - - - - - - - 3 - - - - 2
          2 - - - - 3 - - - - - - - 2 - - - - 3
          7 - - - - 4 - - - - - - -   - - - -   (4 & 5 jumpered on one end
          8 - - - - 5 - - - - - - -   - - - -   but don't connect thru.)
            - - - -   - - - - - - - 4 - - - - 7 (4 & 5 jumpered on one end
            - - - -   - - - - - - - 5 - - - - 8 but don't connect thru.)
          6 - - - - 6 - - - - - - - 20- - - - 4
          4 - - - - 20- - - - - - - 6 - - - - 6

The above 9 pin connections were 'figured out' using the 9<>25 pin
adapters with the following pinouts.

This is the pin outs for adapters from<>to 9<>25 pin cables.

        |-- 9F <> 25M --|                      |-- 25F <> 9M --|
         DB9F or   DB25M                        DB25F or   DB9M
      pin 1 - - - - 8 - - -                         - - - - 1 - - - -
          2 - - - - 3 - - -                       3 - - - - 2 - - - -
          3 - - - - 2 - - -                       2 - - - - 3 - - - -
          4 - - - - 20- - -                       20- - - - 4 - - - -
          5 - - - - 7 - - -                       7 - - - - 5 - - - -
          6 - - - - 6 - - -                         - - - - 6 - - - -
          7 - - - - 4 - - -                       4 - - - - 7 - - - -
          8 - - - - 5 - - -                         - - - - 8 - - - -
          9 - - - - 22- - -                         - - - - 9 - - - -

Another strange cable I ran into was for a HP Plotter (also applies to
the HP Paint Jet).  A standard serial cable would not work, nor would a
null modem cable.  Before you go out and buy an expensive HP cable try
making your own from one of the following pinouts.

Type I (From a Commercially produced cable/computer store)

        |-- COMPUTER --|   >>>   |--HP Plotter--| (Or Paint Jet)
         DB9F  or  DB25F   >>>    DB25M
      pin 3 - - - - 2 - - - - - - - 3
          2 - - - - 3 - - - - - - - 2
          8 - - - - 5 - - - - - - - 20
            - - - - 6 - - - - - - - 20
          5 - - - - 7 - - - - - - - 7

The above 9 pin connections was 'figured out' using the 9<>25 pin
adapters shown above.

Type II (From a Commercially produced cable/computer store)

        |-- COMPUTER --|   >>>   |--HP Plotter--| (Or Paint Jet)
         DB9F  or DB25F    >>>    DB25M
      pin 1 - - - -   - - - - - - - 4
          2 - - - - 3 - - - - - - - 2
          3 - - - - 2 - - - - - - - 3
          4 - - - - 20- - - - - - - 5
          4 - - - - 20- - - - - - - 6
          5 - - - - 7 - - - - - - - 7
          6 - - - -   - - - - - - - 4
          7 - - - - 4 - - - - - - - 8
          8 - - - -   - - - - - - - 20

The above 25 pin connections were 'figured out' using the 9<>25 pin
adapters shown above.

Type III (From a Computer store made cable in use 12/6/93)

        |-- COMPUTER --|   >>>   |--HP Plotter--| (Or Paint Jet)
         DB9F  or  DB25F   >>>    DB25M
      pin   - - - - 1 - - - - - - - 1
          3 - - - - 2 - - - - - - - 3
          2 - - - - 3 - - - - - - - 2
          8 - - - - 5 - - - - - - - 20
          6 - - - - 6 - - - - - - - 20
          5 - - - - 7 - - - - - - - 7
          4 - - - - 20- - - - - - - 5
          4 - - - - 20- - - - - - - 6

The above 9 pin connections were 'figured out' using the 9<>25 pin
adapters shown above.

Type IV (From a Home made cable in use 12/6/93)

        |-- COMPUTER --|   >>>   |--HP Plotter--| (Or Paint Jet)
         DB9F  or *DB25F   >>>    DB25M
      pin 1 - - - -   - - - - - - - 1
          2 - - - - 3 - - - - - - - 2
          3 - - - - 2 - - - - - - - 3
          4 - - - - 20- - - - - - - 5
          4 - - - - 20- - - - - - - 6
          5 - - - - 8 - - - - - - - 7
          6 - - - - 6 - - - - - - - 20
          8 - - - - 5 - - - - - - - 20


* The above 25 pin connections were 'figured out' using the 9<>25 pin
adapters shown above.

Most serial port connections only require a few wires to be connected.
The most common types of connections only require:

        |-- COMPUTER --|         |--  DEVICE  --|
        DB9F  or  DB25F          DB25M  or  DB9F
      pin   - - - - 1 - - - - - - - 1 - - - -
          3 - - - - 2 - - - - - - - 2 - - - - 3
          2 - - - - 3 - - - - - - - 3 - - - - 2
          7 - - - - 4 - - - - - - - 4 - - - - 7
          8 - - - - 5 - - - - - - - 5 - - - - 8
          6 - - - - 6 - - - - - - - 6 - - - - 6
          5 - - - - 7 - - - - - - - 7 - - - - 5
          1 - - - - 8 - - - - - - - 8 - - - - 1
          4 - - - - 20- - - - - - - 20- - - - 4

The above 9 pin connections were 'figured out' using the 9<>25 pin
adapters shown above.

Full pin 25M <> 25F cables have all pins connected straight through:

                  25F        <>        25M

                   1                    1
                   2                    2
                   3                    3
                  ...                  ...
                  23                   23
                  24                   24
                  25                   25

thus making extension cables for either serial or printer cable
connections.

Serial cables that have both Male ends or both Female ends are strange.
The pins are connected from<>to the same pin number on the other end
(1-1, 2-2, 3-3, ... 25-25) but since the gender is the same on both ends
these cables are not extension cables but actually CROSS the wires. If
you were to plug two 'same gender' cables to each other thus making a
connection like:

                  25F  >  25F<>25M  >  25M

                   1      25    25      1
                   2      24    24      2
                   3      23    23      3
                  ...     ...   ...    ...
                  23       3     3     23
                  24       2     2     24
                  25       1     1     25

you would have actually created an extension cable.