[syslinux] S3 Virge DX and vesamenu.c32

[H. Peter Anvin]

Fuller, Erik C wrote:
> I can list all video modes, but in another reply it seemed 640x480 is
> what you're interested in --
> 
> VBE version 1.2
> Mode   attrib h_res v_res bpp layout rpos gpos bpos
> 0x0100 0x001b 640   400   8   4      0    0    0 
> 0x0101 0x001b 640   480   8   4      0    0    0
> 0x0110 0x001b 640   480   15  6      10   5    0
> 0x0111 0x001b 640   480   16  6      11   5    0
> 0x0112 0x001b 640   480   32  6      16   8    0
> 
> Looks like it has the video mode needed so it must lack linear frame
> buffering.  
> 
> I appreciate the explanation.  Several of these older boxes are being
> utilized as hard drive test beds where they net boot to the diag tools.
> 

Linear frame buffer is bit 7 in the attributes (0x0080), so yes. 
Specifically, a mode is usable to vesamenu if at least bits 7, 4, 3 and 
0 are set (0x0099).

	-hpa