User manual

ATHENA CPU User Manual V1.40 Page 10
4.2 Main I/O Connector – J3
An 80-pin high-density connector is provided for access to the user I/O. The following functions
are supported by this connector:
♦ 2 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
The 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 +3VSB
Table 2: J3 – Main I/O Connector