properly distinguishes between intermediate reads which are part of writes,
and ordinary reads. In the former case, only a read which has a different
address than a write is flagged as an error; intermediate reads acting on
the same address as the corresponding write are considered normal, and won't
trigger a break.
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breaks to test whether an illegal read to the write port of cartridge
RAM has occurred. It can be used as follows:
breakif {_rwport == 100} // break if read was done at wport address 100
breakif {_rwport} // break if read was done at *any* wport address
This currently works for all extended RAM carts that worked before.
Specifically, 4A50, DPC, AR and possibly several others aren't supported
yet. More testing is required.
Renamed CartFASC and CartMB to CartFA and CartF0, respectively. This
naming now matches that used in other emulators.
CartMC now properly handles read from write port, by using random
values instead of just zero. However, no test ROMs are available for
this scheme, so there may still be issues.
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The values written and returned in such a case are now more accurate,
and are a combination of the previous databus value and randomization
(the latter emulating the randomness of Z-state bits). This provides
more accurate emulation than before, where zeros were used instead.
In particular, types 3E and E7 are now working correctly for the first
time. Thanks to Batari for suggestions in this area.
Moved random number generation from Cartridge to System class.
The Subversion build number is now shown in the AboutDialog box.
Still TODO is add architecture information (i386, x86_64, etc).
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was duplicate code in many Cart classes and in M6532 class, and since all
these classes are subclasses of Device, it made sense to move the
functionality there instead.
Carts 3E and E7 now return a random value when attempting to read from
the write port. Still TODO is determine what happens to the value at
that address (is it randomized or zeroed?). Thanks to Batari for
suggestions and sample code.
Fixed bug in E7 carts when entering the debugger; bankswitch was being
inadvertantly triggered which caused emulation to fail.
Overall, I need to figure out exactly what happens when reading from
the write port for all carts with extended RAM. There are two things
to consider: what value is written to the address, and what value
is returned.
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starfield effect. More research is required in this area.
Large update to exception handling throughout the codebase. It seems
that in many cases, the correct 'catch' block was never being called.
I never see exceptions thrown very much, so that area doesn't get much
testing. But I guess it's good that Stella doesn't generate many
exceptions :)
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class reworking. Serializer class now handles read/write of state from
files as well as in-memory streams. As a result, Deserializer class has
been removed.
Added state rewinding to the debugger. For now, this is limited to 100
levels of undo, with a new state generated each time a step/trace/frame/
scanline advance is performed. The undo level is 'rolling', in that it
remembers the last 100 levels (so you lose the oldest states when you
start adding more than 100). For now, this is tied to the 'Alt-r' key
in the debugger. Still TODO is add a button for it, and clean up some
TIA output issues when rewinding.
Added support for 6K version of Supercharger ROMs (this fixes issues
with the 6K version of Cubis).
Cleaned up the Serializable infrastructure, making sure that all
classes that need to implement it actually do so now.
Fixed issue with editable widgets in the UI, where pressing Enter
on the keypad wasn't actually being registered.
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the ones that bankswitch in RAM, since I don't know what should happen there.
Added 'exitlauncher' commandline argument, which specifies the functionality
of the 'Exit to launcher' action; should exiting a game actually go back to
the launcher, or exit the program entirely. Also added a UI item in UIDialog
for this.
Reworked the fullscreen/windowed handling in FrameBuffer, simplifying the
logic for determining whether the SDL surface is actually in fullscreen
or not.
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schemes that have multiples areas of RAM. Converted F4SC, F6SC, F8SC,
FASC to this new functionality.
Added ability to modify extended RAM in 3E, CV, E7 and EFSC ROMs.
Note that these ROMs can swap RAM in and out dynamically, so what
you see in the RAM area won't always be RAM.
Updated debugger CpuWidget; decimal and binary values for SP/A/X/Y
are now all shown at the same time (previously the registers had to
share a decimal/binary view).
Updated debugger documentation for recent additions.
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Added CRT simulation as described by Ian Bogost in the AtariAge thread
'CRT simulation for Stella. This is just the first pass, but things
are working nicely so far (for those systems that can support it). It
requires at least OpenGL 2.0 with GLSL (GL Shading language). Added
the commandline arugments 'tv_tex', 'tv_bleed', 'tv_noise' and 'tv_phos'
used to set these various effects, as well as the ability to set them
within the Video Settings dialog. More documentation is forthcoming
on this.
All bankswitch modes that use SC RAM now act correctly when reading
from the write port (the RAM is erased).
Patching ROMs with bankswitch type 0840, SB, UA and X07 is now working.
Went through all the bankswitch classes and converted multiplication/
division to shift operations whenever possible. It's a
micro-optimization, but what the heck; every little bit of speed counts.
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stephena