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Joined: Jun 2001
Posts: 461
O
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O
Joined: Jun 2001
Posts: 461
Oh yeah, the compression format is not trivial at all. DAC dumps would help a lot. Do you know if the 551 has a test mode, like yamaha synths do?

Joined: Jan 2021
Posts: 3
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Joined: Jan 2021
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Yeah, I wrote about it a bit in the driver comments:

Code
	To access the test mode (not mentioned in the service manual):
	Hold the "Start/Stop" and keypad 0 buttons together when turning on the keyboard.
	Afterwards, press one of these buttons:
	- Tone: LCD test (press repeatedly)
	- Keypad 0: switch test (press all front panel buttons in a specific order, generally left to right)
	- Keypad 1 or Rhythm: pedal and key test
	- Keypad 2: ROM test
	- Keypad 4/5/6: sound volume test
	- Keypad 7/8: stereo test
	- Keypad 9: MIDI loopback test
	- Keypad + or Song Bank: power source test
	- Keypad -: pitch wheel test
	- FFWD: exit test mode
	- Stop: power off

I can post DAC captures of the test tone(s) and some other simple ones (i.e. the synth leads) along with the actual ROM data a little later.

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