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2025-01-22 11:09:34

BOSS Dr. Rhythm DR-55 Teardown

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2025-01-22 12:52:34

BOSS Dr. Rhythm DR-55 Teardown

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2024-12-07 15:59:12

Roland T8 Beat Machine Teardown

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BTW, to debug the circuit we used these schematics provided by Florian Anwander's blog:

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There’s some clones of this machine, like the Sound Master SR-88, that also have issues with their NAND gates going bad. Did it affect storing your own patterns? Nice job adding the IC socket

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Before the fix, the clock was not running (two NAND gates are used in the oscillator), so it's hard to tell if patterns were stored correctly. However, after the fix, storing patterns works fine.

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I'm really happy to see a proprietary roland branded chip.

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I am wondering whether it is a custom system-on-chip with, e.g., one or multiple ARM cores, or whether it is just an off-the-shelf but powerful microcontroller that was rebranded...

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If you have ever wondered what's inside Roland's T-8 Beat Machine, here you go: It appears to contain a custom application-specific integrated circuit (ASIC) called Roland E4E (I could not find any information about this microchip). The user interface is likely controlled by the STM326030 microcontroller (from the range of cost-effective MCUs). The T-8 also contains a surprisingly tiny battery; a second battery of the same size would easily fit (thereby potentially doubling the battery runtime).

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