Little Board™/486e Technical Manual
2–2
Table 2–1. Connector Usage Summary
Connector Function Size Key Pin
P1A/B PC/104 Expansion Bus 64-Pin B10
P2C/D PC/104 Expans io n Bus 40-pin C19
J2 Compact Flash Card 50-pin
J3 Flat Panel Video 50-pin 35
J4 LCD Bias Supply Connector 12-pin 3, 10
J5 CRT Video 10-pin None
J6 RS-485 2-pin None
J7 Ethernet Twisted Pair RJ45 None
J10 Power, +5V and +12V 4-pin
Molex None
J11 Serial 1 and Serial 2 20-pin 20
J12 IDE Hard Disk 40-pin 20
J13 Serial 3 and Serial 4 20-pin 20
J14 Floppy Interface 34-p in 6
J15 Parallel Port 26-pin 26
J16 Utility/Keyboard 16-pin 2
Connectors
The I/O connectors are dual-row headers for use with insulation displacement connectors (IDC) and
flat ribbon cable.
A number of the connectors have key pins. Install a blocking key in the corresponding connector
socket on the mating ribbon cable to prevent misalignment.
You can design PC boards with female c onne ctor s in th e same rela tive pos ition s as the Lit tle
Board’s connectors. This eliminates cables, meets p ackag ing requ ire ments , add s EMI f ilter ing, o r
customizes the installation in other ways.
The PC/104-compatible expansion bus is located on connectors P1A/B and P2C/D. The system can
be expanded using Ampro MiniModule expansion products or other PC/104-compliant expansion
modules. These modules can be attached by stacking them directly on the P1 and P2 connectors or
by using standard or custom expansion hardware; including solutions available from Ampro.
Contact your Ampro sales representative for information about alternatives offered by Ampro.
If you plan to use the on-board video controller with a flat-panel LCD that requires a Vee voltage,
you can install Ampro’s optional LCD Bias Supply board on connector J4, as shown in Figure 2-1.
This board can be jumpered to supply positive or negativ e Vee from ±15V to ±3 5V (adj ust able).