RSX-llM/S - RSX-lIM-PLUS Software Dispatch, September 1980 tie Bau

RSX-1IM V3.2 . Seg 3.1.3.9 N
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FULL DUPLEX TERMINAL DRIVER OUESTIONS ANSWERED. (SPR ll-89929Z DD)

A13

How do IT select the size of the driver'"s partition, called

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The following is a compilation of answers to often asked guestions
about the Full Duplex Terminal Driver. These procedures are pro- TEA
vided for information only and are unsupported.

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TTPAR in RSXejiM systems, or TTCOM for RSXeliiMePLUS Systems?

By default, SYSGEN sets tne size o£ TTPAR (TTCOM) to BK words,
but it can usually be made smaller,  TTPAR contains code plus

a private buffer pool, which is allocated in 20 word ehunks

for typeahead bu£fers, (C8 extensions, and I/O0 buffers,

Since the amount o£ I/0 buffers reguired depnends on both system
activity and the length of the I/0 redauests, an exact sizinao
guideline cannot be given, NA rouah algorithm £or determining

; the size of TTPAR is: zda

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(73 PEC % (20 % T) % (60 8 A) z Od 4; si Ro?
Where; P is the size of TTPAR in decimal words
C is tne code size of the driver (from the line "TASK
IMAGE SIZE" in [1,34] TTDRV,MAP)
—T is the number of terminals in tne system
A is the average number of I/0 reanuests pending at any time

The above formula can be used to determine the size of TTCOM £or
RSXe]1MePLIS systems by setting C z 0 (since the code is strictiy
Instruction space and TTCOM is strictly Data space), 2

The value obtained for P is in decimal words; convert to octal A da
byvtes/100(8) for tne TTPAR SET /MAIN command, For MePLIIS Systems,
Convert P to octal words and use the result as the argument £or

the /SIZE switch of the VMR LOAA command. h t .

If space is exhausted in TTPAR (TTCOM), the terminal driver will ita
attemot to use orimary p00l, so i£ you're short on system pool,

pad TTPAR (TTCOM) for comfort, i: iPBg9Tt.9)

Tne following answers involve Changina code within the driver,

It is recommended that a correction file be created to apply the
Changes stated, although it is possible to make the changes with

ZAP or OPEn, The line numbers cited refer to version i of the
aPProvriate module, All the modules reside in (11,10),

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