Acer 9100 System Manual page 107

ECP DMA Channel
This item becomes active only if you select
Extended
as the operation mode. It allows you to
Capabilities Port (ECP)
assign DMA channel 1 or DMA channel 3 for the ECP parallel port
function (as required in Windows 95).
Onboard Floppy Disk Controller
This parameter lets you enable or disable the onboard floppy disk
controller.
Onboard IDE Primary Channel
This parameter lets you enable or disable the primary IDE channel.
When enabled, it allows you access the devices connected to the
primary channel. When disabled, it deactivates the connected
devices.
Onboard PS/2 Mouse (IRQ 12)
This parameter enables or disables the onboard PS/2 mouse. When
enabled, it allows you to use the onboard PS/2 mouse assigned with
IRQ12. When disabled, it deactivates the mouse and makes IRQ12
available for use by of other devices.
Onboard USB
This parameter lets you enable or disable the USB controller on
board. When enabled, it activates the USB function of the system.
When disabled, it deactivates the function.
USB Legacy Mode
This function, when enabled, lets you use a USB keyboard in DOS.
Set this parameter to to deactivate USB keyboard function.
Disabled
3-26 Altos 9100B System Guide