Printronix P6000 Series Maintenance Manual page 57

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Not all of the available 68901 MFP vectors are used. Table 2-11 defines unused vectors.
Table 2-11. Logic C3 Unused Interrupt Vectors
Vector (Hex)
48
45
44
41
40
P6040/P6080 Principles of Operation
Definition Function
Timer B
Timer C
Timer D
GPIB1 GPIB 1 is configured as an I/O output
port, DTR (Data Terminal Ready) to the
Host.
GPIB 0 GPIB 0 is configured as an I/O output
port, RTS (Request to Send) to the
Host.
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