BTAMTEST macro - is type 4, gets no lock.
Calls module IGC0006F.
GTF data is:
- R15 and R0
- No applicable data.
- R1
- Address of the IOB when the SVC was issued.
- IOBERINF
- Address of the RFT message, inserted by the channel end appendage
(IGG019MB).
- IOBERNIF+4
- Address of the parameter list, inserted by the terminal test
control (IGG019MR).