B&B Electronics Parallel Printer Card PIOC Manuale Utente Scaricare il pdf (Pagina 17)

Interfacing the Standard Parallel Port http://www.senet.com.au/~cpeacock

Interfacing the Standard Parallel Port Page 17

Reserved Currently Reserved.

Under Microsoft’s Extended Capabilities Port Protocol and ISA Interface Standard this

mode is Vendor Specified.

FIFO Test Mode While in this mode, any data written to the Test FIFO Register will be placed into

the FIFO and any data read from the Test FIFO register will be read from the

FIFO buffer. The FIFO Full/Empty Status Bits will reflect their true value, thus

FIFO depth, among other things can be determined in this mode.

Configuration Mode In this mode, the two configuration registers, cnfgA & cnfgB become available at

their designated Register Addresses.

If you are in ECP Mode under BIOS, or if your card is jumpered to use ECP then it is a good

idea to initialize the mode of your ECP port to a pre-defined state before use. If you are using SPP,

then set the port to Standard Mode as the first thing you do. Don't assume that the port will already be

in Standard (SPP) mode.

Under some of the modes, the SPP registers may disappear or not work correctly. If you

are using SPP, then set the ECR to Standard Mode. This is one of the most common mistakes that

people make.

Notes

Note

Using Interrupts is available in PDF from

http://www.geocities.com/SiliconValley/Bay/8302/interupt.pdf (62kb)

Note

Interfacing the Enhanced Parallel Port is available in PDF from

http://www.geocities.com/SiliconValley/Bay/8302/epp.pdf (33kb)

Note

Interfacing the Extended Capabilities Port is available in PDF from

http://www.geocities.com/SiliconValley/Bay/8302/ecp.pdf (53kb)

Craig Peacock’s Interfacing the PC

http://www.senet.com.au/~cpeacock

http://www.geocities.com/SiliconValley/Bay/8302/

Any errors, ideas, criticisms or problems, please contact the author at [email protected]

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B&B Electronics Parallel Printer Card PIOC Manuale Utente Pagina 17