555 lines
18 KiB
Plaintext
555 lines
18 KiB
Plaintext
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QUICK GUIDE TO COMPUTER CABLES
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by Bill Becwar
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LEGAL STUFF - This guide is as complete and accurate as I can make
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it, however, I can't be responsible for errors, omissions, typing
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mistakes, bad downloads, or your dog biting you. I know that
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somebody, somewhere is going to cross a wire. Best advice if you
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want to build one of these cables: Complete the wiring all in one
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work session. Then check the connections, preferably with an
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ohmmeter. Go away for a while and do something else, then return
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and CHECK the connections again. If you have any comments or find
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any errors, leave E-Mail to William Becwar on EXEC-PC, the largest
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and finest BBS in the country, (414) 789-4210, or on CompuServe
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72060,251. Good Luck!
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POWER SUPPLY CONNECTORS -
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Typical Power Supply has 6 Connectors: 2 ea. - 6 pin for
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Motherboard Power and 4 ea. - 4 pin for Disk Drive Power.
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Motherboard Power Connectors
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P8 P9
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Pin Signal Pin Signal
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----------------------------- ---------------------------
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1 - Power Good 1 - GND
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2 - +5v (or N.C.) 2 - GND
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3 - +12v 3 - -5v
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4 - -12v 4 - +5v
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5 - GND 5 - +5v
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6 - GND 6 - +5v
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Disk Drive Power Connectors (4 - 4 pin)
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Pin Signal
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-----------------------------
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1 - +12v
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2 - GND
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3 - GND
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4 - +5v
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MOTHERBOARD CONNECTORS -
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Motherboards have various combinations of connectors depending
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on design type and built-in facilities. These will be found in a
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typical clone.
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Backup Battery Connector (AT only)
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Pin Signal
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-----------------------------
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1 - Batt+
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2 - [KEY]
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3 - GND
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4 - GND
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LED Power and Key Lock (AT only)
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Pin Signal
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-----------------------------
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1 - LED power
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2 - GND
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3 - GND
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4 - Key Switch
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5 - GND
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Speaker Connector
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Pin Signal
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-----------------------------
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1 - -Speaker
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2 - [KEY]
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3 - GND
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4 - +Speaker +5v
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Turbo Indicator Connector
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Used only on Turbo switchable machines. Safest Connector on
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the machines that have it; can't be connected backwards!
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Pin Signal
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-----------------------------
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1 - +5v
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2 - *HIGH SPEED
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3 - +5v
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MOTHERBOARD I/O CARD EXPANSION SLOTS
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Not exactly for cabling, but a good reference anyway.
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8-bit slots (PC/XT/AT)
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COMPONENT SIDE NON-COMPONENT SIDE
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Pin Signal Pin Signal
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--------------- ---------------
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A1 -I/O CH CLK B1 GND
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A2 SD7 B2 RESET DRV
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A3 SD6 B3 +5v
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A4 SD5 B4 IRQ 9
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A5 SD4 B5 -5v
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A6 SD3 B6 DRQ 2
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A7 SD2 B7 -12v
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A8 SD1 B8 Reserved / OWS
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A9 SD0 B9 +12v
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A10 -I/O CH RDY B10 GND
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A11 AEN B11 -SMEMW
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A12 SA19 B12 -SMEMR
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A13 SA18 B13 -IOW
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A14 SA17 B14 -IOR
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A15 SA16 B15 -DACK3
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A16 SA15 B16 DRQ3
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A17 SA14 B17 -DACK1
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A18 SA13 B18 DRQ1
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A19 SA12 B19 -REFRESH
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A20 SA11 B20 CLK
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A21 SA10 B21 IRQ7
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A22 SA9 B22 IRQ6
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A23 SA8 B23 IRQ5
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A24 SA7 B24 IRQ4
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A25 SA6 B25 IRQ3
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A26 SA5 B26 -DACK2
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A27 SA4 B27 T/C
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A28 SA3 B28 BALE
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A29 SA2 B29 +5v
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A30 SA1 B30 OSC
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A31 SA0 B31 GND
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Motherbaord Expansion slots continued...
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16-bit Slots (AT only)
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COMPONENT SIDE NON-COMPONENT SIDE
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Pin Signal Pin Signal
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--------------- ---------------
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C1 SBHE D1 -MEM CS16
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C2 LA23 D2 -I/O CS16
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C3 LA22 D3 IRQ10
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C4 LA21 D4 IRQ11
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C5 LA20 D5 IRQ12
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C6 LA19 D6 IRQ13
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C7 LA18 D7 IRQ14
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C8 LA17 D8 -DACK0
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C9 -MEMR D9 DRQ0
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C10 -MEMW D10 -DACK5
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C11 SD08 D11 DRQ5
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C12 SD09 D12 -DACK6
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C13 SD10 D13 DRQ6
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C14 SD11 D14 -DACK7
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C15 SD12 D15 DRQ7
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C16 SD13 D16 +5v
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C17 SD14 D17 -MASTER
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C18 SD15 D18 GND
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Keyboard Connector
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Pin Signal
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-----------------------------
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1 - KBD CLK OUT
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2 - KBD SERIAL OUT
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3 - KBD RESET IN
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4 - KBD GND
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5 - KBD +5v
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FLOPPY DISK CABLES -
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Floppy / Hard Drive Power Connectors
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Pin Signal
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-----------------------------
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1 - +12v
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2 - GND
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3 - GND
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4 - +5v
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Floppy Disk Drive Interface Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - GND 2 - N/C
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3 - GND 4 - N/C
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5 - GND 6 - N/C
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7 - GND 8 - Index
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9 - GND 10 - Motor Enable A
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11 - GND 12 - Drive Select B
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13 - GND 14 - Drive Select A
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15 - GND 16 - Motor Enable B
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17 - GND 18 - Stepper Direction
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19 - GND 20 - Step Pulse
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21 - GND 22 - Write Data
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23 - GND 24 - Write Enable
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25 - GND 26 - Track 0
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27 - GND 28 - Write Protect
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29 - GND 30 - Read Data
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31 - GND 32 - Select Head 1
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33 - GND 34 - (Spare)
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HARD DISK CABLES -
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ST-506 Hard Disk Drive Control/Data Cables
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Floppy / Hard Drive Power Connectors
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Pin Signal
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-----------------------------
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1 - +12v
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2 - GND
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3 - GND
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4 - +5v
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ST-506 Control Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - Head Select 8 2 - GND
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3 - Head Select 4 4 - GND
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5 - Write Gate 6 - GND
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7 - Seek Complete 8 - GND
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9 - Track 0 10 - GND
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11 - Write Default 12 - GND
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13 - Head Select 1 14 - GND
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15 - Reserved 16 - GND
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17 - Head Select 2 18 - GND
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19 - Index 20 - GND
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21 - Ready 22 - GND
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23 - Step 24 - GND
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25 - Drive Select 1 26 - GND
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27 - Drive Select 2 28 - GND
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29 - Drive Select 3 30 - GND
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31 - Drive Select 4 32 - GND
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33 - Direction In 34 - GND
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ST-506 Data Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - Drive Selected 2 - GND
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3 - Reserved 4 - GND
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5 - Reserved 6 - GND
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7 - Reserved 8 - GND
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9 - Reserved 10 - GND
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11 - GND 12 - GND
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13 - MFM Write Data+ 14 - MFM Write Data-
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15 - GND 16 - GND
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17 - MFM Read Data+ 18 - MFM Read Data-
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19 - GND 20 - GND
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ESDI Hard Disk Drive Control/Data Cables
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ESDI Control Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - Head Select 3 2 - GND
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3 - Head Select 2 4 - GND
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5 - Write Gate 6 - GND
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7 - Config/Status Data 8 - GND
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9 - Transfer Ack. 10 - GND
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11 - Attention 12 - GND
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13 - Head Select 0 14 - GND
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15 - Sec/Addr Mark Find 16 - GND
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17 - Head Select 1 18 - GND
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19 - Index 20 - GND
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21 - Ready 22 - GND
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23 - Transfer Request 24 - GND
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25 - Drive Select 1 26 - GND
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27 - Drive Select 2 28 - GND
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29 - Drive Select 3 30 - GND
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31 - Read Gate 32 - GND
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33 - Command Data 34 - GND
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ESDI Data Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - Drive Selected 2 - Sec/Addr Mark Found
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3 - Seek Completed 4 - Address Mark Enable
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5 - Reserved/Step Mode 6 - GND
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7 - Write Clock+ 8 - Write Clock-
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9 - Cartridge Changed 10 - Read Ref. Clock+
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11 - Read Ref. Clock- 12 - GND
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13 - NRZ Write Data+ 14 - NRZ Write Data-
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15 - GND 16 - GND
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17 - NRZ Read Data+ 18 - NRZ Read Data-
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19 - GND 20 - Index
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SCSI Hard Disk Drive Interface Cable
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Pin Signal Pin Signal
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-------------------------------------------------------------
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1 - GND 2 - Data Line 0
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3 - GND 4 - Data Line 1
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5 - GND 6 - Data Line 2
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7 - GND 8 - Data Line 3
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9 - GND 10 - Data Line 4
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11 - GND 12 - Data Line 5
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13 - GND 14 - Data Line 6
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15 - GND 16 - Data Line 7
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17 - GND 18 - Data Parity Line
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19 - GND 20 - GND
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21 - GND 22 - GND
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23 - GND 24 - GND
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25 - N/C 26 - Terminator Power
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27 - GND 28 - GND
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29 - GND 30 - GND
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31 - GND 32 - Attention
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33 - GND 34 - GND
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35 - GND 36 - Busy
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37 - GND 38 - Acknowledge
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39 - GND 40 - Reset
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41 - GND 42 - Message
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43 - GND 44 - Select
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45 - GND 46 - C/D
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47 - GND 48 - Request
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49 - GND 50 - I/O
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DISPLAY ADAPTOR CONNECTORS -
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Monochrome (MDA), Hercules, Color (CGA) Adaptors
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Connector type - DB-9
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 GND 6 Intensity
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2 GND 7 Video *
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3 N/C or RED 8 Horizontal Drive
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4 N/C or GREEN 9 Vertical Drive
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5 N/C or BLUE
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* NTSC Video on some clone boards
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EGA Adaptor
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Connector Type - DB-9
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 GND 6 Secondary Green / Intensity
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2 Secondary Red 7 Secondary Blue / Mono Video
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3 Primary Red 8 Horizontal Drive
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4 Primary Green 9 Vertical Drive
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5 Primary Blue
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VGA Adaptor
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Connector Type - DB-15
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 Red Video 9 [KEY]
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2 Green Video 10 Sync GND
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3 Blue Video 11 Monitor ID - Bit 1
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4 - Monitor ID - Bit 2 12 Monitor ID - Bit 0
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5 - GND 13 Horizontal Sync
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6 - Red GND 14 Vertical Sync
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7 - Green GND 15 N/C (Reserved)
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8 - Blue GND
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PARALLEL PRINTER PORT
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I/O Mapping
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--------------------------
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LPT1: $378-37A
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LPT2: $278-27A
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DB-25 Connector (Computer End)
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 *STROBE 14 *Auto Feed
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2 Data Bit 0 15 *Error
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3 Data Bit 1 16 *Initialize Printer
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4 Data Bit 2 17 *Select Input
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5 Data Bit 3 18 GND
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6 Data Bit 4 19 GND
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7 Data Bit 5 20 GND
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8 Data Bit 6 21 GND
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9 Data Bit 7 22 GND
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10 *Acknowledge 23 GND
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11 Busy 24 GND
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12 Paper Out 25 GND
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13 Select
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Centronics 36 pin Connector (Printer End)
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 *STROBE 19 GND
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2 Data Bit 0 20 GND
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3 Data Bit 1 21 GND
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4 Data Bit 2 22 GND
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5 Data Bit 3 23 GND
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6 Data Bit 4 24 GND
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7 Data Bit 5 25 GND
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8 Data Bit 6 26 GND
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9 Data Bit 7 27 GND
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10 *Acknowledge 28 GND
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11 Busy 29 GND
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12 Paper Out 30 GND
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13 Select 31 *Prime
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14 *Auto Feed XT 32 *Error
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15 {OSCXT} 33 Signal GND
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16 Signal GND 34 N/C
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17 Frame GND 35 N/C
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18 +5v 36 N/C
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SERIAL PORTS
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NOTE: The IBM PC uses a DTE (Data Terminal Equipment) Connection
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standard. Most Modems are DCE (Data Communication Equipment).
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I/O Map
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-----------------------------
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COM1: $3F8-3FF
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COM2: $2F8-2FF
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COM3: $3E8-3EF
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COM4: $2E8-2EF
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DB-9 Connector
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 CD Carrier Detect 6 DSR Data Set Ready
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2 RXD Receive Data 7 RTS Request to Send
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3 TXD Transmit Data 8 CTS Clear to Send
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4 DTR Data Term. Ready 9 RI Ring Indicator
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5 GND Signal GND
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DB-25 Connector
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 GND Ground / Shield 14 {2nd TXD}
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2 TXD Transmit Data 15 Transmit Clock
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3 RXD Received Data 16 {2nd Rec. Clock}
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4 RTS Request to Send 17 {Receive Clock}
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5 CTS Clear to Send 18 {Unassigned}
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6 DSR Data Set Ready 19 {2nd RTS}
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7 GND Ground 20 DTR Data Term Ready
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8 DCD Carrier Detect 21 {Sig. Quality}
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9 {Reserved} 22 RI Ring Indicator
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10 {Reserved} 23 {Data Rate Sel.}
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11 {Unassigned} 24 {Transmit Clock}
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12 {2nd CD} 25 {Unassigned}
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13 {2nd CTS}
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NULL MODEM CONNECTION-
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RS-232 Definition Computer/Terminal Modem
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Signal DTE DCE
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9-pin 25-pin 25-pin
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-------------------------------------------------------------------
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GND Signal GND 5 1 1
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TXD Transmit Data 3 2 3
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RXD Receive Data 2 3 2
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RTS Req. to Send 7 4 5
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CTS Clear to Send 8 5 4
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DSR Data Set Ready 6 6 20
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GND Chassis GND - 7 7
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CD Carrier Detect 1 8 8
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DTR Data Term. Ready 4 20 6
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DTE DCE
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1 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1
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2 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 2
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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3 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 3
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4 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 4
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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5 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 5
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6 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ŀ <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 6
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<20> <20>
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7 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 7
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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8 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 8
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<20> <20>
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20 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 20
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GAME CONNECTOR
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DB-15 Connector
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 +5v 9 +5v
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2 Button 1-1 10 Button 2-1
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3 X1 11 X2
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4 GND 12 GND
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5 GND 13 Y2
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6 Y1 14 Button 2-2
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7 Button 1-2 15 N/C
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8 N/C
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Buttons - Connect from GND to Button inputs
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X and Y pots connect from +5v to X-Y inputs.
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JOYSTICK CONNECTOR
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DB-9 Connector
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Pin Signal Pin Signal
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-------------------------------------------------------------------
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1 JOY0 6 Fire Button
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2 JOY1 7 +5v
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3 JOY2 8 GND
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4 JOY3 9 POT X
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5 POT Y |