SPC8106 S-MOS Systems, SPC8106 Datasheet - Page 225

• Manufacturer Part Number: SPC8106
• Description: LCD/CRT VGA CONTROLLER
• Manufacturer: S-MOS Systems

Appendix H SIMULTANEOUS DISPLAY ISSUES
Here are the BIOS limitations for this display mode.
The basic rules for Simultaneous Display:
IF Allow SimultaneousDisplay = 1
ENDIF
SPC8106
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411-1.0
Allow SimultaneousDisplay
Without Error Checking = 0
Allow SimultaneousDisplay
Without Error Checking = 1
Simultaneous Display will only be officially supported in 480 scan line modes.
The BIOS will use two reserved bits in Auxiliary Register 0Ah to determine if Simultaneous Display should
occur on a mode set. This will follow the rules set in the following table.
Simultaneous Display will only work on a Single Panel.
Autocenter and Stretch will be hardware suppressed during Simultaneous Display, they will continue to read-
back as though they were on.
All power save modes will continue to work in Simultaneous Display.
LCD frame rate may change when Simultaneous Display occurs.
IF Mode 11/12/108 OR Allow SimultaneousDisplay Without Error Checking = 1
ELSE
ENDIF
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
turn LCD on
turn CRT on
IF CRT Available
disable LCD
turn CRT on.
ENDIF
Allow SimultaneousDisplay
= 0
On a mode set:
no Simultaneous Display will
occur
On a mode set:
no Simultaneous Display will
occur
X12-SP-002-03.1
Allow SimultaneousDisplay
= 1
On a mode set:
If mode 11/12/101/108,
enable LCD,
but only if originally on CRT.
If not mode 11/12/101/108,
set CRT active,
disable LCD.
On a mode set:
all modes will be Simultaneous
Display
BIOS Functional Specification
SP2-55