VGA register snapshot collection.

These tarballs contain video RAM and VGA register contents
captured from various VGA/SVGA cards in various video modes.
They are intended to capture how video ram is actually laid
out for the various modes.

Layout:

In each file VGADMPxx.* where XX is the video mode in hexadecimal:

*.CRT       Snapshot of the CRT controller registers
*.SEQ       Snapshot of the sequencer registers
*.DAC       Snapshot of the VGA DAC (palette)
*.GC        Snapshot of the graphics controller registers
*.AC        Snapshot of the attribute controller registers
*.RED       Snapshot of all registers 0x3B0-0x3DF
*.PL0       Video RAM snapshot, VGA plane 0
*.PL1       Video RAM snapshot, VGA plane 1
*.PL2       Video RAM snapshot, VGA plane 2
*.PL3       Video RAM snapshot, VGA plane 3

Since the focus of the snapshot is on standard VGA registers,
SVGA registers are not considered, though extended registers in
each block will be captured as well. The video RAM snapshots
for this reason are also focused only on the 256KB of VRAM
offered in standard VGA mapping, any video RAM following that
(SVGA cards) was not captured.