Little Board™/486
e
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 Expansion 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-pin
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 connectors in the same relative positions as the Little
Board’s connectors. This eliminates cables, meets packaging requirements, adds EMI filtering, or
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 negative Vee from ±15V to ±35V (adjustable).
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