TTMAC.DOC	Documentation for TTMAC.COR file changes

1) audit trail BTKB13		used and tested under v2.1 on 11/70

If you have a DMA terminal interface (such as a DH-11 or DHV-11), you
may find that getting an output interrupt every 36 characters (when
TTDRV buffer is 40. bytes long) is undesirable on a finely tuned system.
The TTMAC.COR file here changes the buffer size to 128. - note that any
size > 40. will work.
	Warning **** when no packets for output character buffering are
available in TTCOM, the TTDRV will use primary pool. Use the TAC program
to study your TTCOM packet usage (included here). If you do large output
QIOs all characters will be copied into TTCOM (or pool) packets for the
duration of the I/O; that is to say they will not free up until the I/O
is killed or completed.

Changing the TTDRV's TTCOM packet size is in no way supported by DEC or myself.

		- Kitty Bethe	(212) 775-4190

2) audit trail BTKB21		used and tested under v2.0 on 11/70

If you have extremely remote dial-in terminals (from countries without
local network carriers or good telephone systems) you may find it useful
to extend the time-out after ring time as we did.