AB-2061G-33 Datasheet, PDF (18/32 Pages) List of Unclassifed Manufacturers – 33Mhz PCI to Local Bus Interface

Printer Handshake Register 70h (2Ch)
This is the mailbox used to pass data from PCI to local. When a PCI write to the
PHR occurs an interrupt to the local processor is generated. When the local
processor reads the register an interrupt to PCI is generated (the interrupt is actu-
ally generated when byte 3 is read, so the local processor should follow the usual
convention of reading that byte last). Each interrupt is individually maskable.
Device Handshake Register 74h (2Dh)
This mailbox is used to pass data from local to PCI. When a local write to the DHR
occurs an interrupt to PCI is generated (again, always write byte 3 last). When PCI
reads the DHR an interrupt to the local processor is generated. Each interrupt is
individually maskable.
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