word address of the first location to be transferred.
A lower: len
number of words to transfer.
Q upper: index
index in the corefile of the to read/written.
The first word has index 1, the last has index 10.
Q lower: readflag
direction of data transfer
0
write from program to the corefile.
1
read from the corefile into the program.
Description:
TSS allocates 10 words in the UST for communication between subsystems.
This space is called the "core file".
DRL CORFIL is used to read or write the core file.