MIDIbox

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====== MIDIbox VGM Player ======

This small synth is a demo of the [[MBHP_Genesis]] module ([[http://midiboxshop.bigcartel.com/product/midibox-quad-genesis-board|available now from the MIDIbox Shop!]]).

===== Hardware Features =====
  * 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

===== VGM Playback Engine Features =====
  * 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

====== Construction ======

You need:
  * STM32F4 core with SD card
  * 2x20 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

===== Front panel 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.

====== Software ======

An [[http://svnmios.midibox.org/listing.php?repname=svn.mios32&path=%2Ftrunk%2Fapps%2Fsynthesizers%2Fmidibox_vgmplayer%2F|official build]] is available now on SVN! Report bugs to me on the forums.
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