Manuals

Manuals
I/O: Dell� Latitude� LM

I/O: Latitude LM

I/O Port Layout

PS/2 Connector | Parallel Connector | Serial Connector | Monitor Connector | I/O Map | IRQ Line Assignments


PS/2 Connector

Layout

Pin Assignments for the PS/2 Connector

Pin Signal I/O Definition
1 EXK_MSDATA I/O External keyboard/keypad/mouse data
2 NC N/A No connection
3 GND N/A Signal ground
4 EXK_MSPWR N/A External keyboard/keypad/mouse supply voltage
5 EXK_MSCLK I/O External keyboard/keypad/mouse clock
6 NC N/A No connection
Shell N/A N/A Chassis ground

Parallel Connector

Layout

Pin Assignments for the Parallel Connector

Pin Signal I/O Definition
1 STB# I/O Strobe
2 PDO I/O Printer data bit 0
3 PDI I/O Printer data bit 1
4 PD2 I/O Printer data bit 2
5 PD3 I/O Printer data bit 3
6 PD4 I/O Printer data bit 4
7 PD5 I/O Printer data bit 5
8 PD6 I/O Printer data bit 6
9 PD7 I/O Printer data bit 7
10 ACK# I Acknowledge
11 BUSY I Busy
12 PE I Paper end
13 SLCT I Select
14 AFD# O Automatic feed
15 ERR# I Error
16 INIT# O Initialize printer
17 SLIN# O Select in
18-25 N/A N/A Signal ground
Shell N/A N/A Frame ground

Serial Connector

Layout

Pin Assignments for the Serial Connector

Pin Signal I/O Definition
1 DCD I Data carrier detect
2 RXDA I Receive data
3 TXDA O Transmit data
4 DTR O Data terminal ready
5 GND N/A Signal ground
6 DSR I Data set ready
7 RTS O Request to send
8 CTS I Clear to send
9 RI I Ring indicator
Shell N/A N/A Frame ground

Monitor Connector

Layout

Pin Assignments for the Monitor Connector

Pin Signal I/O Definition
1 RED O Red video
2 GREEN O Green video
3 BLUE O Blue video
4 NC N/A No connection
5 GND N/A Signal ground
6 GND N/A Signal ground
7 GND N/A Signal ground
8 GND N/A Signal ground
9 NC N/A No connection
10 GND N/A Signal ground
11 NC N/A No connection
12 NC N/A Reserved
13 HSYNC O Horizontal synchronization
14 VSYNC O Vertical synchronization
15 NC N/A No connection
Shell N/A N/A Frame ground

I/O Map

Address

Device

0000 - 001F DMA controller #1
0020 - 003F Interrupt controller #1
0040 - 005F System timers
0060 - 006F Keyboard controller
0070 - 0071 RTC and NMI enable
0080 - 009F DMA page registers
00A0 - 00BF Interrupt controller #2
00C0 - 00DF DMA controller #2
00F0 Coprocessor busy clear
00F1 Coprocessor busy reset
00F8 - 00FF Coprocessor
01F0 - 01F8 Hard-disk controller
0220 - 022F Audio-board configuration registers
0228 - 028B FM synthesizer
02F8 - 02FF COM2
0330 - 0331 MPU 401 MIDI connector
0378 - 037F LPT1
03C0 - 03DF VGA
03F0 - 03F7 Diskette controller
03F8 - 03FF COM1

IRQ Line Assignments

NOTE: The computer does not support IRQ sharing.
IRQ Line Used/Available
IRQ0 Generated by the system timer
IRQ1 Generated by the keyboard controller to signal that the keyboard output buffer is full
IRQ2 Cascaded to second interrupt controller
IRQ3 Used by the infrared port (COM2)
IRQ4 Used by the serial port (COM1)
IRQ5 Used by the audio controller
IRQ6 Generated by the diskette drive controller to indicate that the diskette drive requires the attention of the microprocessor
IRQ7 Used by the parallel port
IRQ8 Generated by the system RTC
IRQ9 Software redirect to INTOA
IRQ10 Reserved
IRQ11 Reserved
IRQ12 Generated by the keyboard controller to indicate that the output buffer of the integrated touch pad or external PS/2 mouse is full
IRQ13 Used by the math coprocessor on the microprocessor
IRQ14 Generated by the hard-disk drive to indicate that the drive requires the attention of the microprocessor
IRQ15 Reserved

 

 

 

 

 

 

 

 

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