Parallel port: Difference between revisions
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* LPT2: 0x278 (IRQ 6) |
* LPT2: 0x278 (IRQ 6) |
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* LPT3: 0x3BC (IRQ 5) |
* LPT3: 0x3BC (IRQ 5) |
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==Using the Parallel Port== |
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{{Stub}} |
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Address = Base Address + 0 |
Address = Base Address + 0 |
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Any byte writen to this register is put on pins 2 through 9 of the port. |
Any byte writen to this register is put on pins 2 through 9 of the port. |
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Any read from this register reflects the state of the port. |
Any read from this register reflects the state of the port. |
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==Status Register== |
===Status Register=== |
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Address = Base Address + 1 |
Address = Base Address + 1 |
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==Control Register== |
===Control Register=== |
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Address = Base Address + 2 |
Address = Base Address + 2 |
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Revision as of 02:46, 1 June 2008
The parallel port uses a sub-d 25 connector to provide a 8-bit data bus. It is commonly used by printers. There are 3 kinds of parallel ports: Standard Parallel Port (SPP), Enhanced Parallel Port (EPP) and Extended Capabilities Parallel Port (ECP). iirc they are all part of IEEE Standard 1284, or is it just the second two?
Pin types
Most parallel ports come in either 36 or 25 pin varieties. 25 being the most common.
Registers & Common Address
Common base addresses are:
- LPT1: 0x378 (or occasionally 0x3BC) (IRQ 7)
- LPT2: 0x278 (IRQ 6)
- LPT3: 0x3BC (IRQ 5)
Using the Parallel Port
This page is a stub.
You can help the wiki by accurately adding more contents to it.
Data Register
Address = Base Address + 0
Any byte writen to this register is put on pins 2 through 9 of the port. Any read from this register reflects the state of the port.
Status Register
Address = Base Address + 1
Control Register
Address = Base Address + 2