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Cirrus Logic BIOS - GET USER OPTIONS

AH = 12h
BL = 9Ah

Return:
AX = options word 1 (see #00031)
CX = options word 2 (see #00032)
BX,DX reserved

See Also: AH=12h/BL=80h - AH=12h/BL=84h - AH=12h/BL=93h - See Also: AH=12h/BL=A3h - AH=12h/BL=A4h - #00732 at INT 1A/AX=B102h

Bitfields for Cirrus Logic options word 1:

Bit(s)  Description     (Table 00031)
0,1    reserved
2-4    monitor type
5-6    maximum vertical resolution
7-9    reserved
10     force 8-bit operation
11-13  reserved
14     vertical refresh frequency at 640x480.
=0 60 Hz.
=1 high refresh
15     reserved

See Also: AH=12h/BL=AEh

Bitfields for Cirrus Logic options word 2:

Bit(s)  Description     (Table 00032)
15-13  vertical refresh frequency at 1024x768
12-11  vertical refresh frequency at 800x600
10-6   reserved
5-4    vertical refresh frequency at 1280x1024
3-0    reserved

See Also: #00033

Bitfields for Cirrus Logic Options word 2 (alternate???):

Bit(s)  Description     (Table 00033)
15-12  vertical refresh frequency at 1024x768.
0000 43i Hz.
0001 60  Hz.
0010 70  Hz.
0011 72  Hz.
0100 76  Hz.
Other reserved
11-8   vertical refresh frequency at 800x600.
0000 56 Hz.
0001 60 Hz.
0010 72 Hz.
0011 75 Hz.
Other reserved
7-4    maximum vertical resolution.
0000 480  scanlines.
0001 600  scanlines.
0010 768  scanlines.
0011 1024 scanlines.
Other reserved
3-1    vertical refresh frequency at 1280x1024.
000 43i  Hz.
001 60   Hz.
010 71.2 Hz (CL-GD5434 rev. E and F).
011 74   Hz (CL-GD5434 rev. E and F).
Other reserved
0      reserved

See Also: #00032

Category: Video - Int 10h - C

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