Ampro Corporation 5001451A manual Universal Serial Bus USB Ports, Using Arrow Keys During Setup

Little Board P6d Module

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 2-16and Table 2-17.

2-17