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msu-md

msu logo

MegaCD driver for msu-like interfacing with CD hardware

for MegaDrive/Genesis

control registers

Address Type Details
0xA12010 command see section commands
0xA12011 argument argument for each command
0xA1201F command clock increment it for command execution
0xA12020 mcd status 0-ready, 1-init, 2-cmd busy

commands

Code Type Arguments Details
0x11 PLAY decimal no. of track (1-99) playback will be stopped in the end of track
0x12 PLAY LOOP decimal no. of track (1-99) playback will restart the track when end is reached
0x13 PAUSE vol fading time.
1/75 of sec
(75 equal to 1 sec) instant stop if 0		 pause playback
0x14 RESUME none resume playback
0x15 VOL volume 0-255 set cdda volume
0x16 NOSEEK 0-on(default state),
1-off(no seek delays)		 seek time emulation switch
0x1A PLAYOF #1 = decimal no. of track (1-99)
#2 = offset in sectors from the start of the track to apply when looping		 play cdda track and loop from specified sector offset

usage

  • Include msu-drv.bin in your binary and call it as function for initialization.
  • Function will return 0 if driver loaded successfully or 1 if MCD hardware not detected.
    • Driver ready for commands processing when 0xA12020 sets to 0

repository contents

content Details
msu-drv.bin compiled driver binary
msu-md-drv driver sources
msu-md-sample driver usage sample

Mega Everdrive Pro

support files and firmware download | buy

  • Cyclone IV FPGA
  • 16MB PSRAM and 1MB SRAM memory
  • High quality 6-layers PCB with hard gold surface finish
  • Supported ROM formats: Genesis, 32X[1], Mega-CD, Master System, NES[2]
  • Ram cart for Mega-CD
  • CD bios swap function turns off region locks for Mega-CD games
  • Hardware MegaKey turns off region locks for Genesis games
  • YM2413 core for Master System games
  • SVP core support
  • Pier Solar mapper support
  • In-game menu. You can save game or return to system menu without physical reset
  • In-game menu supported for Genesis and Master System modes
  • Full EEPROM saves support
  • Real time clock for logging date and time of saves
  • ARM based 32bit I/O co-processor for SD and USB operations acceleration
  • Up to 1024 files per folder or unlimited if file sorting is disabled
  • Multi slot save states. 100 save states slots for each game
  • Instant ROM loading
  • USB port for development and system update without removing SD card
  • Battery voltage monitoring. Battery can be replaced in time if it runs dry
  • Game Genie cheats support

[1] 32X games require 32X addon to be attached.
[2] NES core has limited compatibility. Refer to user manual for details.
NES core currently supported only for NTSC systems.
For Mega-SG "Zero lag" option should be turned off for NES games (accurate Genesis timings required).