Lynx EPM-4 manual Default Enabled, Default IRQ7, Default SPP, Default 133 MHz, Default Write-Back

CMOS Setup / Advanced Configuration

PS/2 MOUSE (IRQ12)

Default: Enabled

When disabled, IRQ12 is freed for other devices.

LPT1 (0378H)

Default: IRQ7

Allows you to disable or specify the IRQ used by LPT1 on the SMSC FDC37B727 Super I/O. When disabled, the IRQ and I/O space are freed.

PARALLEL PORT MODE

Default: SPP

This option allows the user to change the communication mode of the parallel port. The options are: SPP, SPP/EPP1.9, ECP, ECP/EPP1.9, Printer, SPP/EPP1.7, ECP/EPP1.7, and FDD. The FDD option must be set if a floppy drive is used.

CPU SPEED

Default: 133 MHz

The maximum clock rate for the ÉlanSC520 Microcontroller is 133 MHz. It can optionally be set to 100 MHz for a slight power savings. If an extended temperature board version is detected, the default will change to 100 MHz.

CACHE MODE

Default: Write-Back

The 16 kb L1 cache can be configured for either write-through or write-back mode. This option controls the CACHE_WR_MODE in the CPUCTL register (MMCR offset 02h).

WRITE BUFFER

Default: Enabled

When the write buffer is enabled, it buffers all write activity from the CPU, PCI bus, or GP bus. This option controls the WB_ENB bit in the DBCTL register (MMCR offset 40h).

GP BUS TIMINGS

Default: Normal

The GP (ISA) bus timings may need to be slowed to accommodate ISA Plug-n-Play cards. This option modifies registers in the GP Bus Controller, MMCR offsets C08h through C10h.

EPM-4 Reference Manual Configuration / Operation – 13