SPC8104 S-MOS Systems, SPC8104 Datasheet - Page 159

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

1.0
The purpose of this document is to demonstrate how to initialize the SPC8104F0A into a mode
similar to IBM's Standard VGA mode 3 by supplying sample code. The steps involved in this are:
The resulting mode is not BIOS supported, so no DOS text will work, however, writing to the
memory location B800:0000 values 41 07 will put a white letter A in the top left corner.
; MODE3.ASM
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; Programs the SPC8104 for dual 640x480 LCD panels.
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; Sets up registers for mode 3 without the BIOS.
; The code ignores power down issues.
; The code assumes 4ms memory refresh clock.
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; Instructions:
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; Note:
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PW
TEXT SEGMENT WORD PUBLIC 'TEXT'
ASSUME CS:TEXT, DS:TEXT, SS:TEXT
SPC8104
- Make your changes
- Assemble
- Link
- Make a .COM file
412-1.0
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EQU
INITIALIZING THE SPC8104 IN MODE 03 WITHOUT A
BIOS
This program was tested by MS MASM 5.1
Enabling the SPC8104
Unlocking the Auxiliary Port
Setting up the SPC8104 panel specific registers
In this case for a Dual STN, Monochrome 640x480 LCD panel
Setting up the Standard VGA registers for Mode 3 (with the exception of only loading an 8 point font ver-
sus the 16 point font)
Loading the font into Memory (required for text mode only)
Initializing the Palette values
Setting up the attribute registers
Initializing Video Memory
S-MOS Systems, Inc. • Tel: [phone] • Fax: [phone] • http://www.smos.com
8000h
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link MODE3;
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masm MODE3.asm;
exe2bin MODE3.exe MODE3.com
; Port write (RunTable)
Programming Notes and Examples
SP3-5