Specifications

Little Board/P5i Technical Manual
2–48
PC/104-compatible expansion modules can be installed on the Little Board/P5i expansion bus. The
buffered output signals to the expansion bus are standard TTL level signals. All inputs to the Little
Board/P5i operate at TTL levels and present a typical CMOS load to the expansion bus. The current
ratings for most output signals driving the ISA portion of the expansion bus are shown in Tables 2-35
through 2-38, and indicate how the signals are terminated on the Little Board/P5i. The PCI portion of the
expansion bus is shown in Table 2-39.
2.16.1 On-board MiniModule Expansion
You can install one or more Ampro MiniModule products or other PC/104 modules on the Little
Board/P5i expansion connectors. When installed on P1 and P2, the expansion modules fit within the
Little Board/P5i’s outline dimensions. Most Ampro MiniModule products have stackthrough connectors
compatible with the PC/104 specification. You can stack several modules on the Little Board/P5i
headers. Each additional module increases the thickness of the package by 0.66 inches (15 mm). See
Figure 2–12.
Figure 2–12 Stacking PC/104 Modules on the Little Board/P5i
2.16.2 Using Standard PC and AT Bus Cards
Ampro offers several options that allow you to add conventional 8-bit and 16-bit ISA expansion cards to
the Little Board/P5i system. Contact Ampro for further information about optional bus expansion
products.
2.16.3 Expansion Bus Connector Pinouts
Table 2–39 through Table 2–43 show the pinout and signal functions on the PC/104-Plus-compatible
expansion bus connectors. These include P1, P2, and J21.
The Little Board/P5i does not generate ±12VDC or -5VDC for the expansion bus. If devices on the bus
require these voltages, -12V and -5V can be supplied to the bus connector from the utility connector
(J16). +12V can be supplied through J10-4. If a PCI peripheral board requires 3.3V, you can attach this
voltage to J10-5.