HP Vectra Reference Manual page 143

The following chart gives examples of loading the divisor latch
registers to determine the baud-rate.
Baud MSB
(XF9H)
Bits
(XF8H)
Bits LSB
Rate Divisor
7 6 543 2 1
a
7 6 543 2 1
a
75 1536
a a a a a
1 1
a a a a a a a a a
110 1047
a a a a a
1
a a
000 10 111
300 384
a a a a a a a
1 1
a a a a a a a
600 192
a a a a a a a a
11000000
1200 96
a a a a a a a a a
1 100
a a a
2400 48
a a a a a a a a a a
1 1
a a a a
4800 24
a a a a a a a a a a a
1 100
a
9600 12
a a a a a a a a a a a a
1 100
19200 6
a a a a a a a a a a a a
0 1 1
a
Interrupt Enable Register (XF9H)
This register enables and disables the four interrupt signals of the
~
HP24540A.
Bit Data Interrupt
a
1
Enable the received data available interrupt.
a
Disable interrupt.
1
Enable transmitter holding register empty interrupt.
a
Disable interrupt.
2
1
Enable the receiver line status interrupt
a
Disable interrupt.
3 1
Enable the modem status interrupt.
a
Disable interrupt.
~
4-7
a
Always.
126 Serial/Parallel Card