HP Compaq Presario,Presario 1234 Brochure page 31

Compaq Global Mini PCI 56k (V.90) Modem by 3Com
S27 Bitmapped Register
Selects the data bit(s) you want the modem set on, and sets S13 to the total of the values
in the Value column. For example, ATS13.0=17 enables bit 0 (value 1) and bit 4 (value
16). Software compatibility mode (128) forces "9600" connect message for V.32
connections greater than 9600 bps for some software which cannot accept these
messages.
S28 V.32 Handshake Time
Sets the V.32 handshaking time in tenths of a second. A value of 0 eliminates V.32
answer tones for a faster connection, while 255 disables all connections except V.32 at
9600 bps.
S29 V.21 Answer Mode Fallback Timer
Sets the duration, in tenths of a seconds, of the V.21 answer mode fallback timer.
0203-0799-A
1 = V.21 mode
2 = Disable TCM
4 = Disable V.32
8 = Disable 2100 Hz
16 = Enable V.23 fallback
32 = Disable V.32bis
128 = Software compatibility mode
Range: 0 - 255
Default: 8
Units: 0.1 seconds
Range: 0 - 255
Default: 20
Units: 0.1 seconds
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