Category : Tutorials + Patches
Archive   : PCDOCS.ZIP
Filename : PCONNECT.DOC

 
Output of file : PCONNECT.DOC contained in archive : PCDOCS.ZIP
P C C O N N E C T I O N S


Compiled and Annotated by

William C. Parke
(c) 1985,'86,'87,'88

Send comments or corrections to:

William C. Parke
1820 S Street NW
Washington, D.C. 20009



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Serial Ports:

PC, XT 25-pin serial port DB-25P connector configured as DTE (Data-
Terminal-Equipment) RS-232c standard:

Pin Description Direction
1 Chassis ground -
2 Transmit data TX Out
3 Receive data RX In
4 Request to send RTS Out
5 Clear to send CTS In
6 Data set ready DSR In
7 Signal Ground SG -
8 Data Carrier detect DCD In
9 [+Transmit Current loop]
11 [-Transmit Current loop]
18 [+Rec.Current loop 20ma]
20 Data terminal ready DTR Out
22 Ring indicator RI In
25 [-Rec.Current loop 20ma]

A modem or printer would have a DCE (Data-Communication-Equipment)
connector, with the functions of pins 2-3, 4-5, and 6-20 reversed;
and the directions of DCD and RI reversed as well.


AT 9-pin serial port connector (DB-9P) configured as DTE device:

Pin Description Direction
1 Data carrier detect DCD In
2 Receive data RX In
3 Transmit data TX Out
4 Data terminal ready DTR Out
5 Signal Ground SG -
6 Data Set Ready DSR In
7 Request to send RTS Out
8 Clear to send CTS In
9 Ring indicator RI In

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Parallel Ports:

PC 25-pin female DB-25 for printer:

Pin Description Active Polarity Direction
1 Strobe Low Out
2 Data bit 0 High Out
3 1 High Out
4 2 High Out
5 3 High Out
6 4 High Out
7 5 High Out
8 6 High Out
9 7 High Out
10 Acknowledge Low In
11 Busy High In
12 Out of Paper High In
13 Select High In
14 Auto Feed Low Out
15 Error Low In
16 Initialize Low Out
17 Select Input Low In
18 Ground - -
19 Ground - -
20 Ground - -
21 Ground - -
22 Ground - -
23 Ground - -
24 Ground - -
25 Ground - -

Centronics Parallel Connector (Amphenol 57-30360):

Pin Description Active Polarity Direction
1 -Strobe Low In
2 Data bit 0 High In
3 1 High In
4 2 High In
5 3 High In
6 4 High In
7 5 High In
8 6 High In
9 7 High In
10 -Acknowledge Low Out (~5 us pulse)
11 Busy High Out
12 Out of Paper High Out
13 Select High Out
14 -Auto Feed Low In
15 NOT USED - -
16 Logical gnd - -
17 Chassis gnd - -
18 NOT USED - -
19 Gnd for -Strobe - -
20 Gnd for Data 0 - -
21 Gnd for Data 1 - -
22 Gnd for Data 2 - -
23 Gnd for Data 3 - -
24 Gnd for Data 4 - -
25 Gnd for Data 5 - -
26 Gnd for Data 6 - -
27 Gnd for Data 7 - -
28 Gnd for -Ack. - -
29 Gnd for busy - -
30 Ground - -
31 -Initialize Low In
32 -Fault Low Out
33 Ground - -
34 NOT USED - -
35 +5 V (4.7Kohm) - -
36 -Select High In

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Video Ports:

PC Monochrome, DB-9 connector

Pin Description Direction
1 Ground
2 Ground
3 Ground
4 NOT USED
5 NOT USED
6 +Intensity Out
7 +Video Out
8 +Horizontal Out
9 +Vertical Out

PC CGA (Color Graphics Adapter), DB-9 connector

Pin Description Direction
1 Ground Composite Jack:
2 Ground Center : Composite Video ~1.5 V
3 Red Out Outside: Ground
4 Green Out
5 Blue Out
6 +Intensity Out
7 RESERVED
8 +Horizontal Out
9 +Vertical Out

PC EGA RGB, DC-9 connector

Pin Description Direction
1 Ground
2 S. Red Out
3 Red Out
4 Green Out
5 Blue Out
6 +Intensity/S. Green Out
7 S. Blue/mono video Out
8 +Horizontal Out
9 +Vertical Out

VGA RGB, DC-15 connector

Pin Description Direction
1 Red Out
2 Green Out
3 Blue Out
4 RESERVED
5 Digital Ground
6 Red Return
7 Green Return
8 Blue Return
9 Plug
10 Digital Ground
11 RESERVED
12 RESERVED
13 Horizontal Out
14 Vertical Out
15 RESERVED

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Keyboard and Mouse Connections:

PC Keyboard Connector (5-pin DIN)

Pin Description Direction
1 +Keyboard clock In
2 +Keyboard data In
3 +Keyboard reset Out
4 Ground
5 +5 V Out

PS/2 Keyboard and Mouse Connector (6 pin DIN/ 6 pin phone)

Pin Description Direction Phone End Pin
1 Data In B
2 RESERVED A
3 Ground C
4 +5 V Out E
5 Clock In D
6 RESERVED F
Shield Ground Shield

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Game Adapter:

Pin Description
----------------------------------------
1 +5 VDC
2 Button 1
3 Position 0 (X Coordinate)
4 Ground
5 Ground
6 Position 1 (Y Coordinate)
7 Button 2
8 +5 VDC JOYSTICK "A"
----------------------------------------
9 +5 VDC JOYSTICK "B"
10 Button 3
11 Position 2 (X Coordinate)
12 Ground
13 Position 3 (Y Coordinate)
14 Button 4
15 +5 VDC

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Disk Controller Connectors:

PC, XT Floppy Disk 34-pin keyed edge connector (key b/w 6 and 8), even
numbers are on component side:

Pin Discription Direction
1 Ground
2 UNUSED
3 Ground
4 UNUSED
5 Ground
6 UNUSED
7 Ground
8 Index From drive
9 Ground
10 Motor Enable A From controller
11 Ground
12 Drive Select B From controller
13 Ground
14 Drive Select A From controller
15 Ground
16 Motor Enable B From controller
17 Ground
18 Direction (stepper motor) F. C.
19 Ground
20 Step pulse From controller
21 Ground
22 Write data From controller
23 Ground
24 Write enable From controller
25 Ground
26 Track 0 From drive
27 Ground
28 Write protect From drive
29 Ground
30 Read data From drive
31 Ground
32 Select head 1 From controller
33 Ground
34 UNUSED

XT Fixed Disk Controller Connector J1:

Pin Discription Direction
1 Ground
2 -Reduced write current From controller
3 Ground
4 RESERVED
5 Ground
6 -Write gate From controller
7 Ground
8 -Seek complete From drive
9 Ground
10 -Track 00 From drive
11 Ground
12 -Write Fault From drive
13 Ground
14 -Head select 2^0 From controller
15 Ground
16 RESERVED
17 Ground
18 -Head select 2^1 From controller
19 Ground
20 -Index From drive
21 Ground
22 -Ready From drive
23 Ground
24 -Step From controller
25 Ground
26 -Drive select 1 From controller
27 Ground
28 -Drive select 2 From controller
29 Ground
30 RESERVED
31 Ground
32 RESERVED
33 Ground
34 -Direction in From controller

XT Fixed Disk Controller Connectors J2 and J3:

Pin Discription Direction
1 Drive select From drive
2 Ground
3 Reserved
4 Ground
5 NO PIN (key)
6 Ground
7 RESERVED
8 Ground
9 UNUSED
10 UNUSED
11 Ground
12 Ground
13 MFM write data Fron controller
14 -MFM write data From controller
15 Ground
16 Ground
17 MFM read data From drive
18 -MFM read data From drive
19 Ground
20 Ground

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Power Supply Connections:

PC and XT System board AT System board

Pin Function Function
1-1 Ground Power good
1-2 Ground +5V
1-3 -5V +12V
1-4 +5V -12V
1-5 +5V Ground
1-6 +5V Ground
2-1 Power Ground Ground
2-2 KEY Ground
2-3 +12V -5V
2-4 -12V +5V
2-5 Ground +5V
2-6 Ground +5V

Floppy (4-pin molex connector):

Pin Function
1 +12V
2 Ground
3 Ground
4 +5V
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  3 Responses to “Category : Tutorials + Patches
Archive   : PCDOCS.ZIP
Filename : PCONNECT.DOC

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

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