This small synth is a demo of the MBHP_Genesis module (available now from the MIDIbox Shop!).

• Supports one to four MBHP_Genesis modules, allowing the user to play that number of VGM files simultaneously (one on each board)
• OPN2: supports YM2612 and YM3438
• PSG: supports SN76489 and SN76496 directly, SN76494 with external clock generator
• Simple front panel interface
• Entire synth can be powered from USB

• Stream VGM data from SD card; supports Sega Genesis / Mega Drive, Sega Master System, Sega Game Gear, and any other VGM file that includes a YM2612 or SN76489
• Advanced multithreaded system for optimal performance
• Corrects OPN2 frequency commands in real time (hardware OPN2 clocked at 8 MHz rather than 7.67 MHz)
• Corrects PSG noise zero frequency issue to match Sega Genesis embedded PSG behavior
• Supports block and embedded samples
• Seamless VGM looping
• Simple API–project is contained in one short app.c file

You need:

• STM32F4 core with SD card
• 2×20 or larger character LCD
• Small custom front panel board with 1 encoder and 6 buttons (see below)
• One to four MBHP_Genesis modules
• One MBHP_Genesis_LS level shifter board

The front panel board has a single 74HC165 DIN shift register, with the following connections:

• Pin 0: Encoder A
• Pin 1: Encoder B
• Pin 2: Enter button (currently “Play”)
• Pin 3: Menu/Back button (currently “Stop”)
• Pin 4: Softkey 1
• Pin 5: Softkey 2
• Pin 6: Softkey 3
• Pin 7: Softkey 4

The four softkeys each correspond to five characters on the LCD display's bottom row.

An official build is available now on SVN! Report bugs to me on the forums.