OXMPCI952 Datasheet, PDF (74/108 Pages) Oxford Semiconductor – Integrated High Performance Dual UARTs, 8-bit Local Bus/Parallel Port. 3.3v PCI/miniPCI interface.

OXFORD SEMICONDUCTOR LTD.
8.2 Parallel port interrupt
The parallel port interrupt is asserted on the INTA#.
It is enabled by setting DCR[4]. When DCR[4] is set, an
interrupt is asserted on the rising edge of the ACK#
(INTR#) pin and is held until the status register is read,
which resets the INT# status bit as held by the bit DSR[2].
OXmPCI952
DS-0020 Jun 05
Page 74