Peritek
Programming On-board Devices and Memories
5-13
Table 5-7 VMEbus Side Device Buffer (continued)
Selected
Relative
See
by LAR
Address
Device
Section
Function
400
103-13F
DUART A
5.12
The 2681 Dual
400
143-17F
DUART B
Asynchronous Receiver
Transmitters (DUARTs)
provide RS-232 ports for
LK401-type keyboard,
mouse or trackball, and
console, etc.
400
183-19F
SCSI
5.13
Used on the VCT and VCU
(optional). The 5380 Small
Computer Systems
Interface (SCSI) supports
intelligent 8-bit parallel I/O
devices.
400
1C2
ZOOM
5.5
16-bit register access only.
The zoom control register
is used to set the dot clock
frequency, and in some
configurations, front and
back porch horizontal sync
adjust, and sync polarity.
800-BFF
0-3FC
HSP
5.15
32-bit access only.
High
Speed Port (optional)
allows the 34020 to directly
copy data into memory via
a 32-bit port connected to
VMEbus P2 connector.
Note
Except where noted, LAR=400 devices are byte (D8) addresses. Convert
to D16 address by subtracting 1. Convert to D32 address by subtracting 3.
This is due to the fact that the 34020 is little endian and the VMEbus is big
endian.
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