Here are some scans from the Roland PB-300 service manual. It was released in '83 as a
companion to their HP-400 digital piano. It stands as Roland's final, fully-analog drum machine.
First, a runthrough of the presets:
Higher resolution and additional images on imgur here.
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| An AVR replacement CPU offering MIDI triggers |
The Boss DR-110 is an analogue voiced drum machine which was released in 1984. I believe the Dr-110 was the last analogue drum machine by Boss/Roland Corp.
ReplyDeleteThe DR-110's digital noise source keeps it from being fully analog.
DeleteDid you try adding trigger ins for the PB300?
ReplyDeleteI didn't add voltage triggers, but I did replace the CPU and include MIDI triggers.
DeleteHere's a picture: https://i.imgur.com/9X9oU5h.jpg
what cpu replacement is that? I just got a PB300 and am investigating what can be changed.
DeleteThe chip is an AVR microcontroller. The board and code are something custom I made. I can make you one.
DeleteIt's a bit hard to remove the original without damaging the board though. The traces are particularly fragile.
Amazing. Let me know how best to reach you to discuss this. I'm really intrigued by what's possible. I finally switched the notification on here so I can get back to you sooner. Safe and happy holidays!
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ReplyDeleteHey sorry I missed this! I just saw your response. I would love one of these CPUs. I'll reach out now. Thank you for offering!
ReplyDeleteHi Aldergrove.
DeleteI found the schematic for the CPU adapter. I've added it to my Github:
https://github.com/Skidlz/PB-300-CPU
I can't find the code I wrote for it though. I only got as far as implementing the MIDI triggers. There was no pattern support.
Cool thanks! Having a look. I messaged you on Soundcloud if you want to discuss this in more detail. I have ton of questions! Thank for doing this.
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