IBM 2193 - Manual (Page 194)

B-14 IBM Personal Computer User Guide
The following table lists the S Registers summary.
Table 6: S registers
Register Function Range/units Default
S0 Auto-answer ring 0-255 /rings 0
S1 Ring counter 0-255 /rings 0
S2 Escape code character 0-255 /ASCII 43
S3 Carriage return character 0-127 /ASCII 13
S4 Line feed character 0-127 /ASCII 10
S5 Backspace character 0-32 /ASCII 8
S6 Dial tone wait time 2-255 /seconds 2
S7 Remote carrier wait time 1-255 /seconds 50
S8 Comma pause time 0-255 /seconds 2
S10 Carrier loss time 1-255 /10ths of a second 14
S11 Touch-tone dialing speed 50-255 /milliseconds 95
S12 Escape character detect time 0-255 /50ths of a second 50
S29 Flash dial modifier time 0-255 /10 milliseconds 70