Multi-Tech Systems RAS96 Jumpers, J17 Watchdog Timer, J14, J15, J16, J18 CPU Frequency Selection

2 RASCard Description

Table 1. Memory Configurations.

Bank 1	Bank 2	TOTAL
None	None	0 MB
2 × 4 MB	None	8 MB
2 × 4 MB	2 × 4 MB	16 MB
2 × 8 MB	None	16 MB
2 × 8 MB	2 × 4 MB	24 MB
2 × 8 MB	2 × 8 MB	32 MB
2 × 16 MB	None	32 MB
2 × 16 MB	2 × 8 MB	48 MB
2 × 16 MB	2 × 16 MB	64 MB
2 × 32 MB	None	64 MB
2 × 32 MB	2 × 16 MB	96 MB
2 × 32 MB	2 × 32 MB	128 MB

Jumpers

The RASCard has five configuration jumpers. One is used for the watchdog timer; the other four are used to select the CPU frequency and the CPU-to-bus frequency ratio.

J17 Watchdog Timer

Jumper pins 1 and 2 to enable the watchdog timer. Jumper pins 2 and 3 to disable the watchdog timer. The watchdog timer is enabled by default, as shown in Figure 1.

J14, J15, J16, J18 CPU Frequency Selection

Jumper J14, J15, J16, and J18 to select the CPU frequency and CPU-to-bus frequency ratio for the installed CPU, as shown in the following table. In Figure 1, the jumpers are shown configured for a 166 MHz Pentium.

Warning: The RASCard supports only the following Intel Pentium CPUs. Do not replace the original CPU with a Pentium Pro, MMX, AMD, or Cyrix CPU.

Intel Pentium	J14	J15	J16	J18
100 MHz	Out	Out	In	In
133 MHz	In	Out	In	In
166 MHz	In	In	In	In
200 MHz	Out	In	In	In

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