VT8231 datasheet(57/132 Pages) ETC

57 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-51-

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Parallel Port Registers

These registers are located at I/O ports which are offsets from

“LPTBase” (index C6h of the Super-I/O configuration

registers). LPTBase is typically set to allow these ports to be

accessed at the standard parallel port address range of 378-

37Fh.

Port LPTBase+0 – Parallel Port Data .............................RW

7-0

Parallel Port Data

Port LPTBase+1 – Parallel Port Status............................RO

BUSY#

Printer busy, offline, or error

Printer not busy

ACK#

Data transfer to printer complete

Data transfer to printer in progress

5PE

Paper available

No paper available

4SLCT

Printer offline

Printer online

ERROR#

Printer error

1Printer OK

2-0

Reserved

................................... always read 1 bits

Port LPTBase+2 – Parallel Port Control ........................RW

7-5

Undefined

................................. always read back 1

Hardware Interrupt

Disable ...................................................default

1Enable

Printer Select

Deselect printer ......................................default

Select printer

Printer Initialize

Initialize Printer......................................default

Allow printer to operate normally

Automatic Line Feed

Host handles line feeds...........................default

Printer does automatic line feeds

0Strobe

No data transfer ......................................default

Transfer data to printer

Port LPTBase+3 – Parallel Port EPP Address............... RW

Port LPTBase+4 – Parallel Port EPP Data Port 0......... RW

Port LPTBase+5 – Parallel Port EPP Data Port 1......... RW

Port LPTBase+6 – Parallel Port EPP Data Port 2......... RW

Port LPTBase+7 – Parallel Port EPP Data Port 3......... RW

Port LPTBase+400h – Parallel Port ECP Data / Cfg A RW

Port LPTBase+401h – Parallel Port ECP Config B....... RW

Port LPTBase+401h – Parallel Port ECP Extd Ctrl...... RW

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