Repair manual

2-78
THEORY OF OPERATION
Table 2-15. SCSI Interface I/O Signal Lines (Con’t)
Pin # Name Mnemonic Function
45 Reset RST This control line transmits the RST signal
from the host computer to the SCSI Board.
The SCSI Board responds to the Reset
condition by terminating any data on the
SCSI bus. pletely transmitted will be
No conditions of the Digital Palette are
affected - (Parameter settings are not
affected. Any prior exposure which was
completely transmitted will be properly
exposed.)
46 Message MSG This control line transmits the MSG signal
from the host computer to the SCSI Board.
It is used to transfer message information
about command conditions between SCSI
Board and the host computer.
47 Select SEL This control line transmits the SEL signal
from the host computer to the SCSI Board
to indicate that the Digital Palette is the
device to receive its image data.
48 Control/Data C/D This control line transmits the C/D signal
from the host computer to the SCSI Board
to indicate whether control or data
information is being asserted on the I/O data
signal lines.
49 Request REQ This control line transmits the REQ signal
from the SCSI Board to the host computer
indicate a request for data transfer.
50 Input/Output I/O This control line transmits the I/O signa
from the SCSI Board to the host computer
to indicate whether the data signal lines are
being used to input or output data.