RSX-11M/S - RSX-11M-PLUS Software Dispatch, September 1980

RSX-11M V3.2 ; Seg 3.1.3.9 N
DRIVERS

FDX-TTDRV 2 2 o£ Z

02: Tne Full Duplex Terminal Driver will attempt to buffer both input

and output reguests to allow the task to be cneckpointed, How do
.I1 disable this feature if it is causing thrashing in my system?

A23 -o Tne driver stops a task while it per£forms terminal I/0,
Cneckpointing will ocevr only if there is contention for the
memory the I/0 hound task occupies, Thrashing between many tasks
performinoa terminal I/0 can ocecur and will degrade system response due
to excessive checkpointing, especially if the I/0 reguests are for
single characters, To disable stopping and checkpointing a task
performing terminal input, ehande line 134 of the module
m, MAC which reads:

BCS  — UNBI C' .z75/'— RN e JUMP
to INPRIJDAZ$ na ,'J889941-3 :
primtare?sh I01 zdjitoplis: sroni s:
BR UNBI 7DISALLOW ČHECKPOTNTING DURING INPUT

To disable stoprnina and checkpointing a task performing terminal
output, ehange line 811 o£ the module TTRW,MAC which :'readst

8C6 "US CLR16 »$YIIH JN » JUMP

te 1 neživi
BR CLR16 1DISALLOW CHECKPOINTING DURING OUTPUT

Note that a read with prompt £funetion is considered an output reguest
wben the check for buffering is made,

033 . When a remote (dialeup) line is answered, the characteristics of
:" tne line are reset and the speed is changed to a rate specified at
SYSGEN, How can I disable the resetting of the spoj
eharacteristics and baud rate? vi

A33 Tne regetting of the line characteristics is done by routine MANS
in the module TTMOD,MAC (line 167), To maintain the line parameters
across dialvins or to reset them to a particular setting, modify lines
167 through 178 appropriately, Note that this routine returns tne
Cebit clear, so make sure that any local modifications adhere to this,
Also note that line 173 is where the speed is reset, This line should
be commented out (place a semiscolon before it) to not af£ect the baud
rate, In addition, to maintain tbe baud rate constant, the following

line should also be commented out?

If your remote lines are interfaced through a DHeji,
comment out line 594 o£ the module TTYH,MAC, which readss

MOV — TSSMAN,LPR(R3) 333SET LINE PARAMETERS

If your remote lines are inter£aced through a DZei1,
comment out line 190 o£ the module TTYZ,MAC, whieh readsi

kov 0SP,LPR(R3) JLOAD PARAMETERS |

TAM GG

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