When I say banking should be 0 when IBM VGA modes are set, they must be, Cirrus...
Also, updated the vram mask using the gd54xx struct rather than svga's for consistency.
Attempt at fixing the half horizontal display bugs in the best possible way without affecting the vendor drivers (which don't enable bit 6 of gdcreg5 for 256 colors and greater but generic non-vendor specific drivers do).
1. Remove some useless parentheses and correct some identation.
2. The reversed linear mapping activation and a5 vram test are reset properly now.
3. More correct Area Fill emulation, especially in 640x480 mode, (800x600 and 1024x768 too).
This is in lieu of whatever the correct emulation would be (as per the text modes).
Somehow I forgot to add this when reworking the fine scroll implementations.
1. Make the RTG VGA series work on XT's.
2. The RTG3105 is limited to up to 512K of memory, not 1M.
3. Fixed rowoffset in 8bpp mode used by the RTG3105.
If the chips are PCI-based, assume linear addressing is always enabled when the linear base is on valid value (e.g.: not 0). Should fix a regression when linear addressing is used by almost everything in the PCI world (e.g.: Win95's drivers).
1. Cleanups and moving the mach8/32 struct to a dedicated header so that would allow for future 8514/A add-on clones (in paper).
2. Mach8/32's port 0x4ae8/9 and shadow set ports (0x5aee and 0x46ee) now account to the mode changes seriously, should fix most of the horizontal/vertical coordinates while entering GUI modes of various stuff.
3. Horizontal/Vertical window coordinates can only be modified if the display enable bit of port 0x22e8 is set as well as bit 0 of port 0x4aee, fixes most problems noted above.
4. Implemented horizontal blanking stuff a la VGA but actually for 8514/A and clones (like ATI).
5. Added some comments regarding the current situation.
6. The Mach8 was actually a 8514/A clone co-processor, not a single solution card of its own. The ATI Graphics Ultra was a single solution card that is actually a Mach8 + ATI 28800-6 in one, so renaming it accordingly.
7. Fixed garbled/distorted acceleration when device bitmap acceleration is enabled in the ATI Mach8 3.0 Win3.1 drivers.
