3Com 56K manual Bit-mapped registers have up to eight functions

A-4APPENDIX A: S-REGISTERS

		NVRAM Default
S-Registers	Function	Setting
S21	Break length, 10 ms	10
S22	XON character	17
S23	XOFF character	19
S24	Pulsed DSR duration, 20 ms	150
S25	DTR recognition time, 10 ms	5
S26	RTS/CTS delay time, 10 ms	1
S27	Bit-mapped functions*	0
S28	V.32 handshake time, 100 ms	8
S29	V.21 handshake time, 100 ms	20
S33	Bit-mapped functions*	0
S34	Bit-mapped functions*	0
S38	Disconnect wait time, sec	0
S41	Allowable remote log-in attempts	0
S42	Remote Access ASCII character	126
S43	Remote guard time, 200 ms	200
S51	Bit-mapped functions*	0
S53	Bit-mapped functions*	0
S54	Bit-mapped functions*	0
S55	Bit-mapped functions*	0
S56	Bit-mapped functions*	0
S69	Bit-mapped functions*	0
S70	Bit-mapped functions*	0

* Bit-mapped registers have up to eight functions.