SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 125

• Manufacturer Part Number: SPC8104
• Description: VGA LCD CONTROLLER
• Manufacturer: S-MOS Systems

Functions 14h to 19h are reserved by VGA definition. Any requests of these functions will just
simply return and nothing happens.
SPC8104
Function 13h - Write String Functions
If any scrolling occurs, the active page will be scrolled, not the requested page! This “feature” is
also present in IBM's code and it has been determined that it is better to reproduce this in our
code for compatibility.
Function 14h To Function 19h - Null Functions
Function 1Ah - Read/Write Display Combination Code
412-1.0
Return:
Input:
Return:
Input:
Return:
Input:
Return:
Input:
Return:
Input:
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
BL=34h
AL
AL=12h
AH=12h
BL=35h
AL
n/a
AH=12h
BL=36h
AL
AL=12h
AH=13h
AL
BL
BH
CX
DX
ES:BP
n/a
n/a
n/a
AH=1Ah
AL
Cursor emulation control
0=enable, 1=disable
Miscellaneous Function
Display control
Function request
00 - Adapter off (initial)
01 - Planar on (initial)
02 - Active off
03 - Inactive on
ES:DX
Miscellaneous Function
Video data control
0=enable, 1=disable
Write String function
String function
0 - BL=attribute, string=char, char,...
1 - BL=attribute, string=char, char,... cursor moved
2 - String=char, attr, char, attr...
3 - String=char, attr, char, attr... cursor moved
Attribute (if AL=0 or 1)
Page number
Character count
Start cursor position
String pointer
Read/write Display Combination Code
0=read, 1=write
Pointer to 128-byte buffer
(VGA)
X15-SP-002-03
(VGA)
(VGA)
BIOS Functional Specification
SP2-19