1. Do not stall the guest when the passthrough mode is on, fixes hang ups in Windows 3.1 using the 2.3 drivers.
2. In the pitch register, make sure the passthrough goes on when needed only on the ATI Mach32, not 8, fixes mode on/off in text mode when needed.
3. Cosmetic changes and logs.
1. See above, as best as possible, but manuals would be helpful.
2. Reverted the ramdac of the 924 to the sierra one because of a bug that triggers 24bpp mode when it shouldn't.
This patch fixes the pitch that was originally 0 when specifying the 8514/A compatible side in the Mach8/32 cards, which should be 1024 for 8514/A compatible stuff.
1. As tiring as it seems, XOR properly the passthrough bits for mode changes. Fixes everything tested as of now (Mach8/32).
2. Implemented separate destination and source GE pitch and offsets. Fixes Windows 3.1 mach8/32 drivers using devicebitmap enabled (or dmp=1).
3. Properly fixed high and true color patterns so that the aforementioned patterns are drawn correctly in various stuff.
4. Implemented in the best possible way the CRT offset (currently in on conjunction with the GE offset).
5. On ScanToX with bpp set to 24 and dpconfig 0x6211, optmize the SRC/CUR X-Y coordinates at the end of the blit.
6. For mode changes, don't call the mode change recalctimings function if we aren't in the appropriate bits of the respective ports.
7. Separate 8514/A compatible and Extended foreground/background selection implemented, fixes Windows 3.x ATI Ultra drivers from 1992 without hacks.
8. Clear the busy flags when needed without stalling the entire guests (but not the emulator itself) (Mach8/32).
9. The MMIO regs should be enabled only when the VGA aperture has reached a graphics mode (0xA000). This fixes NT 3.x mach drivers in true color mode and making Win3.1 drivers working without a hitch at the same time.
10. Actually implement the hardware 4bpp cursor properly on Mach32.
11. Cosmetic cleanups.
