9. Parallel Printer Port Interface
ÛZIATECH
55
INTERRUPT SELECTION
The interrupt mapping for the PC standard architecture and the ZT 8907 is shown
below.
Parallel Port PC Interrupt
ZT 8907 Interrupt
LPT1
IR5
IR7 or disabled for off-board LPT support
PROGRAMMABLE REGISTERS
There are three registers for the compatibility/extended mode parallel port interface. The
"Compatibility/Extended Mode Parallel Port Interface Addressing" table below shows
the I/O port addressing.
Compatibility/Extended Mode Parallel Port Interface Addressing
Address
Register
Operation
0378h
Line Printer Data
Read/Write
0379h
Line Printer Status
Read
037Ah
Line Printer Control
Read/Write
ADDITIONAL INFORMATION
Refer to the
Standard Microsystems
®
FDC37C665GT
data book for more information on
the parallel controller operating modes. The data sheet is available online at
http://www.smsc.com/main/catalog/fdc37c665gt.html
The data sheet is in Adobe Acrobat format (PDF). If you do not have the Acrobat
Reader, it is available on the Adobe Home Page at