Prometheus CPU User Manual V1.44
Page 8
4. I/O HEADERS
All cables mentioned in this chapter are included in Diamond Systems’ cable kit
C-PRZ-KIT
.
These cables are further described in chapter 25. Some cables are also available individually.
4.1 Main I/O Connector – J3
An 80-pin high-density connector is provided for access to the standard user I/O:
♦
4 serial ports
♦
PS/2
keyboard
♦
ATX Power switch
♦
Parallel
port
♦
PS/2
mouse
♦
Reset
switch
♦
Watchdog timer I/O
♦
IrDA
port
♦
Power and HDD LEDs
This connector mates with Diamond Systems’ cable no.
C-PRZ-01
, which consists of a dual-
ribbon-cable assembly with industry-standard connectors at the user end. The CPU mating
connector includes integral latches for enhanced reliability. Each ribbon cable has 40 wires.
Cable “A”
Cable “B”
1 DCD1
1 STB-
2 DSR
1
2 AFD-
3 RXD
1
3 PD0
4 RTS
1
4 ERR-
COM 1
5 TXD
1
5 PD1
6 CTS
1
6 INIT-
7 DTR
1
7 PD2
8 RI
1
8 SLIN-
9 Ground
9 PD3
10 DCD
2
10 Ground
11 DSR
2
11 PD4
12 RXD
2
12 Ground
13
RTS 2
LPT 1
13 PD5
COM 2
14 TXD
2
14 Ground
15 CTS
2
15 PD6
16 DTR
2
16 Ground
17 RI
2
17 PD7
18 Ground
18 Ground
19 DCD
3
19 ACK-
20 DSR
3
20 Ground
21 RXD
3
21 BUSY
22 RTS
3
22 Ground
COM 3
23 TXD
3
23 PE
24 CTS
3
24 Ground
25 DTR
3
25 SLCT
26 RI
3
26 KB
Clk
27 Ground
27 KB/MS
V-
28 DCD
4
Keyboard
28 KB
Data
29 DSR
4
29 KB/MS
V+
30 RXD
4
30 MS
Clk
31 RTS
4
31 KB/MS
V-
COM 4
32 TXD
4
Mouse
32 MS
Data
33 CTS
4
33 KB/MS
V+
34 DTR
4
34 Ground
35 RI
4
35 Reset-
36 Ground
36 ATX
Power
37
+5V Out
Utilities B
37 KB
Lock
38 Speaker
Out
38 IR
RX
Utilities A
39
IDE Drive LED
39 IR
TX
40 Power
LED
40 +5V
In
