Appendix C
Fill Character Requirements

Fill characters are required to keep the VT100 synchronized with the host computer when the XON/XOFF control codes are not used. Table C-1 shows the VT100 fill character requirements for every receive speed at which the terminal is capable of operating. No entry in a column indicates that fill characters are not required in that specific case.

Receive Baud Rate Control Function
NEL, IND, LF, RI (Smooth scroll feature selected) DECALN DECCOLM ED NEL, IND, LF, RI (Jump scroll feature selected) EL DECINLM All others except DECTST and RIS
19200.0 384 243 243 90 60 4 2 2
9600.0 192 122 122 45 30 2 1 1
4800.0 96 61 61 23 15 1 1
2400.0 48 30 30 11 7
2000.0 40 25 25 9 6
1800.0 36 23 23 9 6
1200.0 24 15 15 6 4
600.0 12 8 8 3 2
300.0 6 4 4 1 1
200.0 4 3 3 1 1
150.0 3 2 2 1
134.5 3 2 2 1
110.0 2 1 1 1
75.0 2 1 1
50.0 1 1 1