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2006-10-19
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Club 100 Library - 415/939-1246 BBS
937-5039 NEWSLETTER, 932-8856 VOICE
FASTMODEM - A software modem speed up for the Model 100 : Bob Scott
This file describes the use of FSTMDM.100, a program which allows you to
speed up the M100 modem by 50% to 450 baud. Some CIS direct dial numbers
support this rate (use GO PHONES to check), however it is NOT supported by
TeleNet or TYMNET. Of course, two M100's can use this rate to communicate
with each other over a dialup circuit.
Cautions:
This program nastily grabs and clears high memory. It also reassigns the
TELCOM f7 key to give you a readout of bytes free while you're online. f6
is reset as described below. This program CANNOT be used with an autologin
macro of any type (yet). If you can put up with these "features", it
really does speed up the internal modem.
Theory:
The M100 modem can be pushed to as much as 600 baud over standard phone
lines. Since CIS thoughtfully supports 450 baud, it is possible to
communicate at that faster rate with an M100. The program FASTMDM loads a
machine language routine above HIMEM and assigns the online TELCOM function
key F6 to call the routine. When executed, the M/L program resets the
internal baud rate generator to 450 baud. Since TELCOM sets the rate to
300 when it shifts to online mode, you must press F6 after going online,
but BEFORE typing anything(hence the restriction on login macros). If you
type anything before pressing F6, CIS will sense that you are at 300 baud,
and will not let you change to 450.
Use:
Clear any machine language programs out of high memory. Place the cursor
over FASTMDM and press RETURN. You will see the screen flash "Installing
450 bps" then get the menu back. You may now enter TELCOM and dial CIS
manually, or with a number from ADRS.DO, just so long as it is followed by
only a "<>" (remember, NO login strings!). After you get connected,
indicated by the label line chaning to the online mode ("Up Down" etc.) and
BEFORE typing anything press F6. You'll hear a beep, which indicates that
you are in 450 baud mode. You can then hit "ENTER", login and enjoy.
After you finish your TELCOM session, you can remove the machine language
routine, and free up high memory for other uses, by again executing FSTMDM
from the main menu. You'll see the legend "Removing 450 bps.." and be
returned to the main menu. (The TELCOM F6 key will be set to a CLEAR
SCREEN function by the program when it deinstalls).
Reference:
For you hackers, the M/L routine is:
DI
PUSH PSW
MVI A,85
OUT 188
MVI A,65
OUT 189
MVI A,195
OUT 184
CALL 16937
POP PSW
EI
RET
Permission for non-commercial use granted to M100 SIG members. All other rights reserved.