PIN DESCRIPTION

20/51

Release B

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

2.2.11 MISCELLANEOUS

SPKRD

Speaker Drive. This the output to the

speaker and is AND of the counter 2 output with

bit 1 of Port 61, and drives an external speaker

driver. This output should be connected to 7407

type high voltage driver.

SCL, SDA I C Interface

. These bidirectional pins

are connected to CRTC register 3Fh to implement

specifications, they have open-collector output

through pull-up resistors.

They can be used for the DDC1 (SCL) and DDC0

(SDA) lines of the VGA interface.

SCAN_ENABLE

Reserved. The pin is reserved

for Test and Miscellaneous functions.