TwoMbit is a cycle accurate emulator for Sega's 8-bit game consoles
(Master System, Gamegear, SG-1000)

includes a cross-platform emulation library, so someone could build a gui without having to know the sms internals

notes:

- if you are using a mouse as input device, the cursor is hidden after activation. Press escape to show the cursor again.

- if you are using a bios keep in mind that the combination of game, bios and region matters like the real systems. So not all combinations are working.

- there are a few pal games which have glitches playing with us/jp region selected. These are no emulation bugs. It behaves the same at a real system.

- you can emulate a sms1 or sms2 unit. Like the real system, not all games run on both revisions correctly.

- if you want to use a window/fullscreen resolution not listed, please modify the config.ini

- most lcd monitor supports 60 Hz only. If you want to play a pal game with original scrolling, you should use a crt monitor. With a tool like powerstrip you can prepare a resolution for 50 Hz. But beware some crt models could be damaged permanently. So read manual and find out if 50 Hz is supported.


v 1.0 beta -> v 1.0.1
[general]
- switched to gcc for compiler
- switched to QT 4.8 for Gui ( c# / .net is no more )
- build libsms (cross-plattform)

[emulation]
- gamegear emulation
- sg-1000 emulation
- emulating additional cart work ram (Ernie Els Golf, the castle, Othello)
- emulating bus contention
- emulating game gear bios
- emulating custom sram sizes (Shining force)
- emulating eeprom of the baseball series games
- emulating lightpahser, paddle (japanese and export), sportspad (japanese and export), 3d glasses, Terebi Oekaki
- emulating gear-2-gear at cycle level
	- parallel (Squinky Tennis in micro machines, Primal Rage, ...)
	- serial 
	- different baud rate settings
- emulating backward compatibillity of gamegear(mastergear) and sms
- emulating yamaha2413
- fex(zip, 7z, rar, gzip), bzip2, untar for compressed roms

[bugfixes]
- removed cache for irq detection, now irqs will be detected one cpu cycle before opcode edge ( simplified the overall process)
- fixed sample playback
- differentiate between sg and sms/gg vdp delay and access window behavior.

to do:

feature doings
- cheats
- savestates
- replace directx to make TwoMbit platform independant

accuracy doings
- sn76489: writing to regs will not processed without delay
- vdp: accurate access windows during sprite processing
- vdp: split sprite subprocessing in timed steps (like bg processing) and not one sprite at a time
- yamaha2413: sub sample accuracy

