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ISABR(4) Device Drivers Manual (hp300) ISABR(4)

isabrFrodo ISA bridge

isabr0 at frodo?
isa* at isabr?

The isabr driver provides access to the ISA slot found in model ‘t’ HP 9000/4xx workstations.

frodo(4), intro(4), isa(4)

Interrupt numbers 0, 1, 2 and 8 are permanently masked on hp300 systems. Therefore ISA devices should not configured to use them.

ISA interrupts are not handled correctly. Some devices cause the frodo(4) chip to interrupt, but without any change in its status registers; others will correctly interrupt, but frodo(4) will not ack the interrupt, resulting in an interrupt storm.

The 4-slot EISA bridge found in model ‘s’ workstations is not supported yet.

May 31, 2007 OpenBSD-5.3