Specifications

System Macros Invoked by Drivers
LOADALT
LOADALT
Loads a set of Q22–bus alternate map registers.
Format
LOADALT
Description
The LOADALT macro calls IOC$LOADALTMAP to load a set of Q22–bus
alternate map registers (registers 496 to 8191). Map registers must already be
allocated before the LOADALT macro can be invoked.
When the LOADALT macro is invoked, register R5 must contain the address of
the UCB. LOADALT destroys the contents of R0 through R2.
2–44