Since you've taken the time to read this Roland Boss DR-110 Service Manual, I'd much appreciate it that if you do some kind of nifty (or even minimal) modification to the DR-110, please email me and let me know what you've done, and if you'd be so kind to provide schemes and/or instructions as a sort of 'thanks for letting me have the DR-110 schemes Matt' kind of gesture. Please send em to levithnt@nfdc.net and let me know if you would mind if I posted them publicly on the same web site that these schemes are available from. Enjoy, happy modding!.
Intermittent DC supply (such as loose AC adaptor or battery connection or quick turning OFF-ON of the power switch) may up set power ON. Reset when a transient of DC voltage is shorter than the time constant of RESET circuit. The resultant will be loss of noise sound. Four generators oscillate at different frequencies which are determined based on analyses of live symbal sounds. Interrelations between frequencies are so critical that slight deviation of one frequency can cause beat sound or distortion. To let the generators stay in a specific frequency, CI, C4, C12 and C13 should be less than 5% (j) of tolerance. The voice generators are categorized into two groups: damping oscillator for drum sound and a combination of swing type VCA and envelope generator for metalic sounds.
The CPU enters external interrupt routine on a rising edge of INT CLK from IC2a, b which also serve as a part of CY sound generator, and reads in TEMPO CLK and key switches through ports D0-D3 and through R00-R03. In reading the above, the CPU first turns ports D0-D3 "H", cutting off D5A-D8A, D5B-D8B and D1B-D4B, disconnecting the diodes from IC3 NAND gates and the ports R00-R03. With an H being applied on one input pin, each gate of IC3 will turn its output to "L" when the other in put pin is H (closing of STOP, START or BANK, or during H period of TEMPO CLK). Ports R00-R03 are pulled up internally and go low when their mate IC3 outputs turn to L.
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