MEKA v0.80 Alpha is released. MEKA is a multi-machine emulator for MS-DOS, MS-Windows and maybe GNU/Linux. The following machines are supported by MEKA:

* Sega Game 1000 (SG-1000)
* Sega Computer 3000 (SC-3000)
* Sega Super Control Station (SF-7000)
* Sega Mark III (+ FM Unit)
* Sega Master System (SMS)
* Sega Game Gear (GG)
* ColecoVision (COLECO)
* Othello Multivision (OMV)

MEKA v0.80 Alpha Changelog:
Inputs: Fixed dead keys when switching focus in/out of the application (namely with ALT+TAB).
Inputs: Cleaned up inputs inconsistencies, ALT+F9 --> CTRL+F9 (Sega Keyboard toggle), ALT+F11 --> CTRL+F11 (Background display toggle)
Debugger: fixed disassembly/backtracking bug with IX/IY instructions using offset + constant.
Debugger: STACK command more generous with evaluating symbols.
Debugger: STACK command shortcut added in debugger interface.
Debugger: fixed visual glitch on most-right side of disassembly.
Debugger: Added "Step Frame" (CTRL+F12) item in Debug Menu.
Debugger: Added "Load State & Continue" (CTRL+F7) item in Debug Menu.
added new fonts
added the possibility to resize windows by clicking on lower-right corner
added the possibility the change some fonts in .CFG file
fixed some GUI focusing issues
made scrollbar easier to use

Download: MEKA v0.80 Alpha
Source:Here