. .dsk / .nib images
. ProDOS format / DOS 3.3 init
. authentic / enhanced disk access speed
For zero-length files, resize to the complete file size when first opened (#506)
. Support both .dsk and .nib
Created a new class FormatTrack to encapsulate the new track formatting logic
Improved precision of 'authentic' drive mode's spin emulation (#125)
Save-state: (save-state DiskII unit v2)
. support Format Track state
. save DiskLastCycle
DenibblizeTrack(): added some debug asserts and comments
Updated for VS2008/VS2013/2015/2017 projs & remove dependency on ddraw.lib for VS2013/2015
Updated disk logging:
. Moved all LOG_DISK_xx macros to new DiskLog.h (since shared by Disk.cpp and DiskFormatTrack.cpp)
. For write nibble: option to log cycle count & sync byte count
. For written track: option to log gap1/2/3 and track size
. For disk latch r/w: option to log when D5AA96 detected
Other:
. Debugger: Fix CD cmd to support absolute paths (#505)
. Debug 'G(o)' cmd now defaults to normal speed (and precise video updates)
. New debug 'GG' cmd enables full speed (and periodic video updates)
. Single-stepping (normal or full speed) now routed through ContinueExecution()
. Removed Cpu6502()/Cpu65C02() check for debug breakpoints
. Removed the (undocumented) SHIFT+F7 feature to exit debugger for 'normal speed breakpoints'
. Removed the g_bDebugNormalSpeedBreakpoints variable
. Specifically IBIZA.DSK demo which streams data from the disk throughout (ie. so runs at full-speed all the time)
. Update the screen every frame, but only if video memory has changed (check AZTEC.DSK loading time)
. NB. When running at full-speed, then 6502 emulation doesn't do cycle-accurate video updates
Fixed crash that could occur when switch video mode (F9) when running at full-speed
. Occured when g_nVideoClockVert was >= 192
. means that disk accesses (eg. loading) is much quicker
Correct naming of video modes (in UI and code)
Pixel adjust for NTSC B&W and Color video modes to align with other video modes
Fixed JoyUpdateButtonLatch() to debounce in 5mecs instead of 5secs!
SpkrToggle() was using redundant global ('cyclenum') when using the PC speaker.
. I reworked the code (as it looked out-of-date),
but probably better to just remove all the PC speaker support.
Removed complex case below for:
. VideoHasRefreshed(), 'anyupdates'
. VideoCheckPage()
Detailed notes below.
---
Video updates in ContinueExecution() loop:
'anyupdates' gets set if there were any page-flip(s) in last ~17030 cycles:
anyupdates |= VideoHasRefreshed();
ie. VideoRefreshScreen() was called outside of this loop.
If there's been a call to VideoRefreshScreen() outside of this loop,
and then the video framebuffer gets written to, ie. VideoApparentlyDirty() returns TRUE,
then don't call VideoRefreshScreen() from this loop for 3 frames.
(If a VideoRefreshScreen() is called outside of this loop then restart the 3 frame count.)
So..
if the game is flipping, the VideoApparentlyDirty() will return FALSE (since game writes to other framebuffer).
if the game is not flipping, then VideoHasRefreshed() will return FALSE (since no flips occur).
Therefore this complex case above probably only arises at a boundary eg. when the game is transitioning between these 2 modes,
and so if the emulator does the very occasional screen update in this main loop, it is of no consequence.
(I guess this extra logic was to throttle video updates on very old slow machines)
---
VideoCheckPage(BOOL bForce) was called twice in main-loop:
UnexpectedPage if g_bVideoDisplayPage2 != SW_PAGE2
Once each time through the loop (ie. every 1ms), with bForce=0
if UnexpectedPage && >500ms since last flip then VideoRefreshScreen()
Once each video frame (ie. ~17030 cycles) when not flipping, with bForce=1
if UnexpectedPage then VideoRefreshScreen()
Basically this was all about supporting FullSpeed mode, and limiting the calls to VideoRefreshScreen().