http://www.benryves.com/projects/cogwheel
A software emulator primarily for 8-bit Sega hardware, such as the Sega
Master System, Sega Game Gear and SG-1000. The ColecoVision is also supported.
The following features are currently supported:
Z80 CPU (emulates all documented and most undocumented features).
TMS9918A video with custom Sega VDP Master System and Game Gear extensions.
Supports multiple versions (hardware revisions, PAL/NTSC) and emulates bugs
depending on version.
SN76489 (PSG) sound.
Standard ROM mapper, Codemasters mapper and various simple flat-memory RAM
and ROM mappers.
More accurate memory emulation than usual allowing you to boot a BIOS
(disabled by default).
Sega joypad emulation and control via keyboard or joysticks.
ColecoVision joypad emulation via keyboard with limited joystick support.
Hardware profiles for SG-1000, SC-3000, SMS1, SMS2, Game Gear and
ColecoVision.
Japanese/Export hardware differences.
The following features are planned:
A decent Windows front-end GUI with debugging features.
More input devices (light gun, rollerball).
The following features would be nice, but are a bit beyond me:
SF-7000 emulation; I can handle the SMS as I've programmed it myself, and the
SG-1000 isn't too different. Having never worked with the SF-7000 hardware, I
have to try and make sense of the system from very limited data and a few
datasheets, and as such have no idea what I'm doing.
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