(someone wrote)
"I may be wrong but I have the Impression hat the 360/20 version of
BAS/BASR (that machine's equivalent to BAL/BALR had a different op
code from the current BAS/BASR."
I have assembled BAS and BASR with the Tachyon assemmbler with the
right X'4D' and X'0D' opcodes. I believe these are from the 360/67.
There are some other diagnoses.
I believe one jumps to a specified address in microcode, but the
useful addresses aren't well documented.
More are for the later serial numbers, with microcode in core.
-- glen