Pins 17-25 are signal grounds. Do not connect them direct to a shield ground. Pin 14 provides +5V power. Conned this pin only if power is required by the external device.
Floppy Disk Connector:
Pin:
Name:
Description:
1
/RDY
Disk Ready
2
/DKRD
Disk Read Data
3-7
GND
Ground
8
/MTRXD
Disk Motor Control
9
ISELI
Select Drive 1
10
IDRES
Disk Reset
11
/CHNG
Disk Changed
12
+5V
+5V Power
13
/SIDE
Disk Side Select
14
/WPRO
Write Protected
15
/TKO
Track 0 Detected
16
/DKWE
Disk Write Enable
17
/DKWD
Disk Write Data
18
/STEP
Step Disk Heads
19
DIRB
Select Head Direction
20
/SEL2
Select Drive 2
21
/SEL0
Select Drive 0
22
/INDEX
Disk Index Pulse
23
+12V
+12V Power
External IDE Connector:
Pin:
Name:
Description:
1
/IDE-RESET
Drive Reset
2
D0
Data bit 0
3
D2
Data bit 2
4
D4
Data bit 4
5
D6
Data bit 6
6
GND
Ground
7
D8
Data bit 8
8
D10
Data bit 10
9
D12
Data bit 12
10
D14
Data bit 14
11-17
GND
Ground
18-19
+5V
5V Power
20
GND
Ground
21
D1
Data bit 1
22
D3
Data bit 3
23
D5
Data bit 5
24
D7
Data bit 7
25
GND
Ground
26
D9
Data bit 9
27
D11
Data bit 11
28
D13
Data bit 13
29
D15
Data bit 15
30
/IOW
I/O Write
M
/IOR
I/O Read
32
IDE-IRQ
Interrupt Request
33
IDE-A2
Address bit 2
34
IDE-A1
Address bit 1
35
IDE-A0
Address bit 0
36
/BICS1
Chip Select 1
37
/BICS0
Chip Select 0
Serial Port:
Pin:
Name:
Description:
1
DCD
Carrier Detect
2
RXD
Receive Data
3
TXD
Transmit Data
4
DTR
Data Terminal Ready
5
GND
Ground
6
DSR
Data Set Ready
7
RTS
Request To Send
8
CTS
Clear To Send
9
RI
Ring indicate
RGB Video Connector:
Pin:
Name:
Description:
1
/XCLK
External Clock
2
/XCLKEN
External Clock Enable
3
RED
Analog Red
4
GREEN
Analog Green
5
BLUE
Analog Blue
6
DI
Digital Intensity
7
DB
Digital Blue
8
DG
Digital Green
9
DR
Digital Red
10
/CSYNC
Composite Sync
11
/HSYNC
Horizontal Sync
12
/VSYNC
Vertical Sync
13
GNDRTN
Return for /XCLKEN
14
/ZD
Zero Detect
15
/CI
Clock Out
16-20
GND
Ground
21
NC
No Connect (-12 volts on A1200)
22
+12V
+12V Power
23
+5V
+5V Power
Pins 21-23 provide power. Connect these pins only if the device requires it.
AT Keyboard Port:
Pin:
Name:
Description:
1
KCLK
Keyboard Clock
2
KDAT
Keyboard Data
3
NC
No Connect
4
GND
Ground
5
+5V
+5 volts power
Audio Connector:
Pin:
Name:
Description:
1
AUDIO_12V
Audio Voltage
2
LEFT_EXT
Left Signal Input
3
RIGHT_EXT
Right Signal Input
4
/EXT_AUDIO
5
AUDIO_GND
Audio Ground
6
GND
Ground
APPENDIX B: QUICK REFERENCE JUMPER SETTINGS
"0N" indicates that a jumper block is connecting two pins. "OFF" means that the jumper block is either detached completely, or is hanging off only one pin of the pair.
Jumper Function
1 Controls the number of memory banks contained on the SIMM
ON
=
2 Banks of Memory (a 2 or 8 Megabyte SIMM)
OFF
=
1 Bank of Memory (a 1 or 4 Megabyte SIMM)
Default position: OFF
2 Controls the size of the memory banks contained on the SIMM
ON
=
4 or 8 Megabyte SIMM
OFF
=
1 or 2 Megabyte SIMM
Default position: OFF
3 Disables Memory Configuration
ON
=
Defeat Autoconfiguration or No Ram Installed
OFF
=
Normal Autoconfiguration
Default position: ON
4 Power On Delay
ON
=
Adds additional 10 seconds for hard drive to Spin up on initial cold starts
OFF
=
Normal boot time
Default position: OFF
5 Right Alt control for AT keyboards ON = Keyboard has two ALT keys
OFF
=
Keyboard has no right ALT key so function is mapped to right CTRL key
