Nuked SC-55

Roland SC-55 emulator, by nukeykt.

Supported models:

• SC-55mk2 (v1.01 firmware is confirmed to work)
• SC-55mk1 (v1.21/v2.0 firmwares are confirmed to work)
• CM-300/SCC-1 (v1.10/v1.20 firmwares are confirmed to work)
• SC-55st (v1.01)
• JV-880 (v1.0.0)
• SCB-55/RLP-3194
• RLP-3237

Special thanks:

• John McMaster: SC-55 PCM chip decap.
• org/ogamespec: deroute tool.
• SDL team.
• Wohlstand: linux/macos port.
• mattw.
• HardWareMan.
• giulioz: JV-880 support

License

Nuked SC-55 can be distributed and used under the original MAME license (see LICENSE file). Non-commercial license was chosen to prevent making and selling SC-55 emulation boxes using (or around) this code, as well as preventing from using it in the commercial music production.

Status

3 ICs are needed to be emulated:

• Roland PCM chip
• Hitachi H8/532 MCU
• Mitsubishi M37450M2 MCU

MCUs are emulated using info from their datasheets. PCM chip info is derived from analyzing decapped chip.

PCM chip tracing progress

MCU emulation progress

Install

Put firmware image into the same folder as Nuked SC-55. Files should be names as such:

SC-55mk2 (v1.01):
R15199858 (H8/532 mcu) -> rom1.bin
R00233567 (H8/532 extra code) -> rom2.bin
R15199880 (M37450M2 mcu) -> rom_sm.bin
R15209359 (WAVE 16M) -> waverom1.bin
R15279813 (WAVE 8M) -> waverom2.bin

SC-55st (v1.01):
R15199858 (H8/532 mcu) -> rom1.bin
R00561413 (H8/532 extra code) -> rom2_st.bin
R15199880 (M37450M2 mcu) -> rom_sm.bin
R15209359 (WAVE 16M) -> waverom1.bin
R15279813 (WAVE 8M) -> waverom2.bin

SC-55 (v1.21):
R15199778 (H8/532 mcu) -> sc55_rom1.bin
R15209363 (H8/532 extra code) -> sc55_rom2.bin
R15209276 (WAVE A) -> sc55_waverom1.bin
R15209277 (WAVE B) -> sc55_waverom2.bin
R15209281 (WAVE C) -> sc55_waverom3.bin

SC-55 (v2.0):
R15199799 (H8/532 mcu) -> sc55_rom1.bin
R15209387 (H8/532 extra code) -> sc55_rom2.bin
R15209276 (WAVE A) -> sc55_waverom1.bin
R15209277 (WAVE B) -> sc55_waverom2.bin
R15209281 (WAVE C) -> sc55_waverom3.bin

CM-300/SCC-1 (v1.10):
R15199774 (H8/532 mcu) -> cm300_rom1.bin
R15279809 (H8/532 extra code) -> cm300_rom2.bin
R15279806 (WAVE A) -> cm300_waverom1.bin
R15279807 (WAVE B) -> cm300_waverom2.bin
R15279808 (WAVE C) -> cm300_waverom3.bin

CM-300/SCC-1 (v1.20):
R15199774 (H8/532 mcu) -> cm300_rom1.bin
R15279812 (H8/532 extra code) -> cm300_rom2.bin
R15279806 (WAVE A) -> cm300_waverom1.bin
R15279807 (WAVE B) -> cm300_waverom2.bin
R15279808 (WAVE C) -> cm300_waverom3.bin

JV-880 (v1.0.0):
R15199810 (H8/532 mcu) -> jv880_rom1.bin
R15209386 (H8/532 extra code) -> jv880_rom2.bin
R15209312 (WAVE A) -> jv880_waverom1.bin
R15209313 (WAVE B) -> jv880_waverom2.bin
Expansion PCBs -> jv880_waverom_expansion.bin (optional)

SCB-55/RLP-3194:
R15199827 (H8/532 mcu) -> scb55_rom1.bin
R15279828 (H8/532 extra code) -> scb55_rom2.bin
R15209359 (WAVE 16M) -> scb55_waverom1.bin
R15279813 (WAVE 8M) -> scb55_waverom2.bin

RLP-3237:
R15199827 (H8/532 mcu) -> rlp3237_rom1.bin
R15209486 (H8/532 extra code) -> rlp3237_rom2.bin
R15279824 (WAVE 16M) -> rlp3237_waverom1.bin

Additional info

• Nuked SC-55 will listen to the specified MIDI IN port (default is port 0). Use -p:<port_number> command line argument to specify port number. To use it with the other applications use external MIDI pipe software (e.g. loopMIDI).

• SC-55mk2/SC-55mk1 buttons are mapped as such (currently hardcoded):

Q -> POWER
W -> INST ALL
E -> INST MUTE
R -> PART L
T -> PART R
Y -> INST L
U -> INST R
I -> KEY SHIFT L
O -> KEY SHIFT R
P -> LEVEL L
LEFTBRACKET  -> LEVEL R
A -> MIDI CH L
S -> MIDI CH R
D -> PAN L
F -> PAN R
G -> REVERB L
H -> REVERB R
J -> CHORUS L
K -> CHORUS R
LEFT -> PART L
RIGHT -> PART R

• JV-880 buttons are mapped as such (currently hardcoded):

P -> PREVIEW
LEFT -> CURSOR L
RIGHT -> CURSOR R
TAB -> DATA
Q -> TONE_SELECT
A -> PATCH_PERFORM
W -> EDIT
E -> SYSTEM
R -> RHYTHM
T -> UTILITY
S -> MUTE
D -> MONITOR
F -> COMPARE
G -> ENTER
COMMA -> ENCODER L
PERIOD -> ENCODER R

• -mk2, -st, -mk1, -cm300, -jv880, -scb55 and -rlp3237 command line arguments can be used to specify rom set. If no model is specified emulator will try to autodetect rom set (based on file names).

• Due to a bug in the SC-55mk2's firmware, some parameters don't reset properly on startup. Do GM, GS or MT-32 reset using buttons to fix this issue.