Radio Shack TRS-80 Model 3 - Page 56

TRS-80 MODEL III
In technical terms, we are storing the send-rate code in the most significant four bits
(' 'nibble' ') of 16888, and the receive-code in the least significant nibble.
Baud-Rate Codes
Desired
Error
Baud Rate
Baud Rate
(0/0)
Code
50
0
0
75
0 1
110
0
2
134.5
0.016
3
150
0
4
300
0
5
600
0
6
1200 0 7
1800 0
8
2000
0.253
9
2400
0
10
3600
0
11
4800
0
12
7200
0
13
9600
0
14
19200
3.125
15
Parity/WordLength/Stop-Bit Code
You pack all of this information into one byte, using the following formula:
Code (Parityselect* 128) + (Word *32) + (Stop *16) +(Parityonoff* 8)
+ (Transmit *4) +(DTR *2) + RTS
where:
Parityselect
= 0 for odd parity
= 1for evenparity
Word
= ofor 5-bit words
= 1for 6-bit words
= 2 for 7-bit words
= 3 for 8-bit words
Stop
= 0 for 1stop-bit
= 1for 2 stop-bit
Parityonoff
= 0 to enable parity
= 1to disableparity
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