Implement the more flexiable `evcnt' interface as discussed (briefly) on
tech-kern and now documented in evcnt(9).

- Have SYS_DEV_xxx device cookie symbols to select and install proper
interrupt handlers into intrtab[] array, rather than the idea of devices
in 'psuedo' TURBOchannel slots.
- Nuke symbols for p

- Have SYS_DEV_xxx device cookie symbols to select and install proper
interrupt handlers into intrtab[] array, rather than the idea of devices
in 'psuedo' TURBOchannel slots.
- Nuke symbols for psuedo TC slots.
- Abandon never/unlikely used intr_disestablish()s.

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RCS ID police.

Arrange comment descriptions for internals of TC DECstations.

Very large scale change to sweep obstracles to remove 3MAX IOASIC disguise.
- Rework ibus device configuration and interrupt handler assignment.
- Remove TC device exposure in 'mainbus.c'
- Squash 'i

Very large scale change to sweep obstracles to remove 3MAX IOASIC disguise.
- Rework ibus device configuration and interrupt handler assignment.
- Remove TC device exposure in 'mainbus.c'
- Squash 'ibus_{3100,5100}.c' into a file; it can not cope with 3max.
- 'struct confargs' -> 'struct mainbus_attach_args'
Now about to remove tc_slot_info[] and tc_enable_interrupt inherited from
4.4BSD.

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- Nuke old leftover bogocities, round one; externs for non-existent
functions, less-intuitive #define's in inappropriate header files.

Rework pmax turbochannel config, as suggested by Jason Thorpe.
Also make TC framebuffer-console search table-driven.

Does not yet include "tcasic" layer; there's no such hardware on DECstations
and

Rework pmax turbochannel config, as suggested by Jason Thorpe.
Also make TC framebuffer-console search table-driven.

Does not yet include "tcasic" layer; there's no such hardware on DECstations
and nothing for a tcasic layer to do.

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