Specifications

Installation 19
The SYSGEN display in Example 1–1 shows that for the first DECvoice
the CSR is 761242, and the Vector is 320. The switchpack settings for the
first DECvoice are as follows:
The settings for switchpack E67 (moving from S6 to S1)
are000101.
The settings for switchpack E68 (moving from S6 to S1)
are010001.
The settings for switchpack E59 (moving from S6 to S1)
are011010.
For the second DECvoice the CSR is 761244, and the Vector is 330. The
switchpack settings for the second DECvoice are as follows:
The settings for switchpack E67 (moving from S6 to S1)
are000101.
The settings for switchpack E68 (moving from S6 to S1)
are010010.
The settings for switchpack E59 (moving from S6 to S1)
are011011.
1.4 Interrupt Vector Address Assignments
In a Q-bus system, the addresses between 300
8
and 774
8
are reserved
for floating vector space. Assign these addresses in sequence as listed in
Table 1–4.
Each device needs two 16-bit locations for each vector. For example, a
device with one receive and one transmit vector needs four words of vector
space.
1.4.1 Assignment Rules
The vector assignment rules are as follows:
1. Each device uses a vector address equal to n words, where n is the
Size listed in Table 1–4. For example, DECvoice uses four words of
vector space. If the device’s vector was 300
8
, the next available vector
would be at 310
8
.
2. There are no gaps between vectors, except those needed to align an
octal modulus.