OK, according to "Technical Aspects of Data Communication," John McNamara,
Copyright 1977 by Digital Equipment Corporation, these are speeds for
asynchronous communications (doesn't seem to have a sync table):
Five bit:
45.45
50
56.86
74.2
75
91
Six bit:
45.45
48
49.1
55.21
56.75
56.86
60.6
66.67
69.25
74.2
80
135
Seven bit:
45.45
56.75
61.35
67.34
74.2
75
76.92
100
134.5 <- IBM 1050, 2740, 2741 std. speed (selectric-based terms)
600
Eight bit:
45.45
56.75
67.58
73.33
74.07
74.1
74.2
84.61
100
110
135
150
165 Model 37 TTY for Western Union
then 300 up to 9600
For stop bits, the book lists 1, 1.42, 1.5, and 2. The difference stop bits
are what make for such weird numbers, though some modems have even more
bizzare rates, such as 200 (top speed of British Post Office Datel 200
service), and 1800 (top speed of Bell 20-type modems).
Will J
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Received on Fri Oct 27 2000 - 18:23:59 BST