* Latch and reset mouse axis counts on first falling TR edge while
selected.
* Added mouse support to 4-player adaptor.
* Fixed a bug when reading control pad buttons with 4-player adaptor.
* machine/mc68328.cpp: Split MC68328 device into a base class with shared functionality, and derived MC68328 and MC68EZ328 models.
* video/sed1375.cpp: Added roughly-functional implementation of the Epson SED1375 LCD controller.
Machines promoted to working
------------------------
3Com Palm IIIc [Ryan Holtz]
* Use full country names in description.
* Use lowercase for descriptive text in descriptions.
* Removed zero offsets in regions with a single file loaded.
* bus/megadrive/jcart.cpp: Turned controller ports into slots - no need
to simulate controllers in the cartridge device.
* sega/megadriv.cpp: Simplified wired 6-button controller to use a
single input port per pad.
* megadriv_rad.cpp: Changed to use A/B/C/X/Y/Z button labels like the
real systems, added reset buttons to a couple of units that have them.
* puckpkmn.cpp: Considering boards without the U6612 exist, assume it
uses a Mega Drive II VDP clone with integrated FM sound.
Use a memory view to switching between Game Gear and Master System compatibility I/O space mapping. Got rid of most of the conditional code checking whether it's a Game Gear driver.
Got rid of the special Game Gear EXT port slot. It's the same thing as a Mega Drive controller/expansion I/O port with a different connector.
sega/mdioport.cpp: Added a variant for the Game Gear with the TH/PC6 interrupt latch, and added it to the Game Gear.
* Moved YM sound out of "core" Mega Drive state, and made more devices
required in "base" Mega Drive state.
* Made Pico/Copera derive from "core" Mega Drive state so they aren't
carrying unnecessary baggage (all it uses is the CPU and VDP).
* Corrected title for puckpkmna.
-cpu/avr8: Mask ADC samples to ten bits on acquisition.
-cpu/avr8: Added minimal ADC support (in particular, ADC interrupts are
not implemented).
-sega/megadriv.cpp: Further broke up base Mega Drive class.
* Created a light-weight base class with just the core functionality,
used for "Genie" hardware (Puckman Pockimon).
* Moved built-in controller emulation to a derived class so it isn't
lurking underneath the consoles with pluggable controllers.
* Moved the Sun Mixing Mega Drive bootlegs to their own source file -
they're substantially different, not using the I/O blocks for input.
-sega/sms.cpp: Untangled SG-1000 Mark III slightly.
