Copyright 2001 Diamond Systems Corp. Jupiter-MM-SIO User Manual V1.3 p. 9
4. SERIAL PORT CONFIGURATION
Please refer to the drawing of Jupiter-MM-SIO on page 4 for locations of the configuration items mentioned here.
Port and Interrupt Register Address Selection
Each peripheral board in the computer system must have a unique I/O address or block of addresses. The
Jupiter-MM-SIO actually uses five I/O address blocks: one for each of the four serial ports and one for the
interrupt status register. Each port’s address block consists of 8 consecutive addresses, while the interrupt status
register occupies a single address.
The I/O addresses are set with jumper block J9, located at the right edge of the board. Eight different I/O address
combinations are selectable. The address shown below for each port is the base address of that port, i.e. the
lowest address of the port’s I/O address block.
J9: Serial Port Address Selection
A
B
C
Port 1
Port 2
Interrupt
Status
In
In
In
3F8
2F8
220
Out
In
In
3E8
2E8
220
In
Out
In
380
388
224
Out
Out
In
240
248
224
In
In
Out
100
108
240
Out
In
Out
120
128
244
In
Out
Out
140
148
248
Out
Out
Out
160
168
24C
Serial Protocol Selection
Different protocol configurations are possible for each serial port. Protocol selection is made by installing jumpers
in the positions indicated below in the configuration headers J7 or J8, depending on the port.
J7:
Port 1 protocol configuration
J8:
Port 2 protocol configuration
Protocol
1
2
3
4
5
6
RS-232
Out
In
Out
Out
In
Out
RS-422
Int
Out
Int
Out
Out
Out
RS-485
In
Out
Out
In
Out
In