The document shows the work done on simple parallel port interface with the computer using c language. With this knowledge anybody can set up a simple circuit for interfacing microcontroller with c...
The document shows the work done on simple parallel port interface with the computer using c language. With this knowledge anybody can set up a simple circuit for interfacing microcontroller with c...
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Parallel Port Interfacing using Assembly Language
Computer
port (hardware)
A 'port' serves as an interface between the computer and other computers or peripheral devices. A port is a specialized outlet on a piece of equipment to which a plug or cable connects.
Example
ports
USB
Example
ports
FireWire
Example
ports
Ethernet
port
Example
ports
Serial Port
Example
Parallel Port
ports
Example
ports
PS/2 Connector
Example
ports
VGA Connector
Electrical
signal transfer
Electronically, hardware ports can almost
always be divided into two groups based on the signal transfer:
Serial ports send and receive one bit at a time via a single wire pair (Ground and +/-). Parallel ports send multiple bits at the same time over several sets of wires.
Electrical
signal transfer
Parallel Port a type of interface found on computers for connecting various peripherals. is a parallel communication physical interface. is also known as a printer port
Parallel Port Addresses When the computer is first turned on, BIOS (Basic Input/Output System) will determine the number of ports you have and assign device labels LPT1, LPT2 & LPT3 to them. Usually the address for LPT1 is 378h.
PORT Name
PORT Address
LPT1
0x3BC (956)
LPT2
0x378 (888)
LPT3
0x278 (632)
Parallel Port Addresses To know your Parallel Port address, do the following: Go to Start > Control Panel > System > Hardware Tab > Click on Device Manager > Look for Ports in the device list > Double click on LPT1 > Click on the Resources Tab. In that you can see the starting address of I/O Range.
Parallel Port Pins
Circuit
Diagram
CPU
Modes
Kernel Mode In Kernel mode, the executing code has
complete and unrestricted access to the underlying hardware.
User Mode In User mode, the executing code has no ability to directly access hardware or
reference memory.
User Port Driver is a kernel mode driver for Windows NT/2000/XP/Vista/Win7 that gives usermode programs access to I/O ports. from Tomas Franzon. Download Site: http://hem.passagen.se/tomasf/UserPort/ UserPort.zip
UserPort Installation Copy UserPort.SYS to %WINDIR%\SYSTEM32\DRIVERS Start UserPort.EXE
add the addresses you want and remove the others click on start
Programming .model tiny .code main: mov al, 00000001b mov dx, 378h out dx, al mov ax, 4c00h int 21h end main
