Turbo Switch Connector; Turbo Led Connector - Intel 486MIS Quick Start Manual

Turbo Switch Connector

The Turbo switch (TURBO) is a 2-pin BERG strip. It is used to connect
the front panel 2-position push switch to the system board speed
switching circuitry. In Turbo speed, the cache memory is enabled and full
speed of 32-bit memory transfer is utilized.
cache memory is disabled. In both speeds, the ISA expansion bus timing
compatibility is still preserved.
Pin
1
2
Notes:
- System runs at Turbo speed when pins 1 and 2 are shorted.
- System runs at Slow speed when pins 1 and 2 are open.

Turbo LED Connector

The Turbo LED connector, marked as 'TB/LED', is a 2-pin BERG strip. It
is used to connect a CPU operating frequency indicator LED from the
front panel to the system board. The pin assignments are indicated
below:
Pin
1
2
Page 16
Description
Turbo Speed
Ground
Description
LED Cathode
LED Anode
486MIS System Board User's Manual
In non-turbo speed, the