and implemented in SDL
* sequencer controller register 0x01 bit 0 controls the width of the characters.
This value is used to calculate the screen width.
* attribute controller register 0x10 bit 2 controls the appearance of graphics
characters (ASCII 0xC0 - 0cDF). A change of this value forces a charmap update
to rebuild the font bitmaps.
* the SDL display library uses the new feature described above
* the other display libraries recalculate the screen width, since they are using
a fixed font width of 8 for now.
- VGA: attribute controller register 0x10 bit 2 (enable_line_graphics) does not
switch the palatte in CGA mode
check.
Commented out a number of instances of invalidate_prefetch_q(),
for branches which do not change CS since the EIP window mechanism
takes care of validating that EIP lands in the current page or not
in the main cpu loop anyways.
Fixed a couple cases (v8086 mode and real mode) of loading CS where
the EIP page window was not invalidated in segment_ctrl_pro.cc.
That may fix some aliasing problems reported before (OS2).
- line offset handling simplified
- calculate textres_x and textres_y after changing the font dimensions
- unnecessary size check in function dimension_update() removed
ATTENTION: the Elpin VGA BIOS uses a delay of 280 vertical retraces after
displaying the copyright text
- changes to the horizontal or vertical pel panning registers force a redraw of
the screen
- screen update problems in text mode fixed
- sort order of the CRT register write cases changed
- fixed calculation of the byte offset for standard VGA modes if line compare
is active
- force a resize of the screen after a change of the display mode (text/graphics)
- mem_write(): skip the rotation of the cpu byte if 'data_rotate' is 0
You can now choose for each disk on the ata interfaces the
disk mode, between :
- flat : one file flat layout
- concat : multiple files layout
- external : developer's specific, through a C++ class
- dll : developer's specific, through a DLL
- sparse : stackable, commitable, rollbackable
- vmware3 : vmware3 disk support
- undoable : flat file with commitable redolog
- growable : growing file
- volatile : flat file with volatile redolog
- z-undoable : gziped flat file with commitable redolog
- z-volatile : gziped flat file with volatile redolog
A new "bxcommit" utility can merge commitable redologs to
flat images.
Notes from the author:
Here is another one of my speed up patches. Unlike my previous speedups
this one will help more platforms than just X86. It cleans up the Data
Xfer instructions. Since the Data Xfer instructions are the most often
executed instructions it gives a noticable boost in speed. The basic
optimization technique was to eliminate intermediate variables and pass
a pointer to the final destination or original source to the
read_virtual_whatever and the write_virtual_whatever functions.
If set, the screen size will be horizontally doubled in CGA and standard
VGA modes.
- doublescan feature for CGA mode 320x200x4 added
- removed trailing spaces in VBE update code
the address offset between two lines on the screen in all VGA modes.
It depends on the CRTC offset register value and the address mode (byte, word,
dword)
- moved screen update code to the end of the write handler. If a register change
should force a redraw of the screen, the variable 'needs_update' must be set
to 1.
- changes to the attribute controller palette index register now force a redraw
of the screen
- modeX: calculation of the tile numbers fixed
