Installing Processor Boards
23
4
Adding SCSI Peripherals
The MK401 includes two SCSI-2 controllers — both SCSI buses are available
via connections on the front panel or via the processor module backplane. Up to
3 additional SCSI buses can be added using standard SBus cards, and these are
available via connections on the SBus cards.
The 2 on-board SCSI buses can be taken from the processor module backplane
by using an MK516 module SCSI card. This transfers the buses onto polarised
ribbon cable connectors which can be wired to SCSI disks within the processor
module.
The MK516 can support up to 5 SCSI buses, only 2 are currently used.
SCSI Termination
Two switches on the MK401 front panel allow the SCSI bus termination to be
switched; with the switches down termination is on.
DD
In
17
DA
On
24
DTR
On
20
Table 4-2
RS232 Channel B Pinout.
Signal
Input/Output
Pin number
TXD
Out
14
RXD
In
16
RTS
Out
19
CTS
In
13
DCDB
In
12
Table 4-1
RS232 Channel A Pinout.
Signal
Input/Output
Pin number
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