2-15
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
The following table describes the ports and switches.
Ports
Pin designation
Description of ports
Floppy Disk
X50
Two-drive capacity (82078 compatible)
360kB, 720kB, 1.2MB, 1.44MB
3F0h-3F7h, 370h-377h, disconnectable
IRQ 6, edge triggered
34-pin standard connector
IDE hard disks
X4, X3
Four-drive capacity
170h-177h, 1F0h-1F7h, disconnectable
IRQ14, IRQ15, edge triggered
2*40-pin standard connector
COM1
X10
3F8h-3FFh, disconnectable
IRQ4, edge triggered
25-pin socket connector, V24/V28
COM2
X11
2F8h-2FFh, disconnectable
IRQ3, edge triggered
9-pin, standard connector
LPT1/PRINTER
X9
378h-37Fh, disconnectable
IRQ7, edge triggered
25p-pin standard socket connector
VGA
X402
3B0h-3BFh, 3C0h-3CFh, 3D0h-3DFh, disconnectable
IRQ9, edge triggered
15-pin standard connector
Keyboard
X6
060h-064h
IRQ1, edge triggered
6-pin mini Din socket
Mouse
X7
060h-064h
IRQ12, edge triggered
6-pin mini Din socket
Power supply
X80, X90
2 PS/2 connector (P8, P9), 6-pin
MPI/DP
X800
0CC000h-0CC7FFn or 0DC000h-0DC7FFh
IRQ5, edge triggered
9-pin sub-D socket connector
Special connector
Pin designation
Description of ports
X15
Reset key, speaker, status bar indicators, power supply, front
connections
only RI25/45: 10-pin connector
X16
Status bar indicators
only PG 740, 760: socket connector for 8-pin flexible connection
X26, X30
Fan supply, 2 connectors (2-pin)
X19, 20, 21, 22
4 SIMM sockets, 32-bit
X1
EISA socket connector for direct connector (ISA; PCI signals)
X23
Socket for second level cache, 64-bit
X12
ZIF socket, CPU socket 7
X24
Lithium battery port
Description of
Ports and
Switches
Motherboard