Ampro Corporation LITTLE BOARD 5001451A - Manual (Page 35)

Little Board P6d Module
2-17
Using Arrow Keys During Setup
During Setup, the serial console arrow keys and function keys must be simulated. To simulate the
function keys, enter two keystrokes, an “F” followed by the function key number. Thus, function
key F3 is simulated with the literal “F3” typed on the keyboard. (Don’t type the quotes). F10 is
simulated with “F0”.
Note
The keystroke simulations are only valid during Setup, not during
normal operation. The arrow keys are simulated with the substitute
keystrokes shown in Table 2-15.
Table 2-15. Arrow Key Substitutions
Function Substitute Keys
Up ^ or Ctrl e
Down v or Ctrl x
Right > or Ctrl d
Left < or Ctrl s
PgUp Ctrl r
PgDn Ctrl c
COM Port Table
When the system boots under DOS, the serial ports are initialized to 9600 baud (typical). To
preserve the selected console port parameters stored in Setup, the Ampro ROM BIOS deletes the
selected console port from the internal COM port table, normally used by DOS to locate the serial
ports. With the port deleted from the COM port table, DOS cannot change its parameters. Because
it is not listed in the BIOS COM port table, it is not assigned a COMn designation (COM1, COM2,
etc.).
Universal Serial Bus (USB) Ports
The Universal Serial Bus connects USB devices with a USB host, in this case, the Little Board P6d
module. The USB physical interconnect is a tiered star topology, or tree, consisting of hubs and
USB devices. Each USB segment is a point-to-point connection between hubs or between hubs and
USB devices. The entire tree can support up to 127 USB devices. The USB interface standard is
for keyboards, mice, modems, digitizer pads, and other low- to medium-speed peripherals. The bus
can run at 12Mbps or 1.5Mbps, depending on the pull-up resistor on the peripheral device. A 1.5k
ohm pull-up on the +data line sets the speed to 12Mbps. A 1.5k ohm pull-up on the -data line sets
the speed to 1.5Mbps. The power to the peripheral device is current limited with self-resetting
fuses. Each USB interface is implemented as a two-wire differential pair for data, a power wire, a
ground wire, and a shield wire. The USB port signals appear on the two USB connectors (J4 and
J5), as shown in Table 2-16 and Table 2-17.