Summary of BARE METAL GIVES THIS PI SOME CLASSIC SYNTHS
This article describes MiniDexed, a bare-metal Raspberry Pi project that emulates eight Yamaha DX7 synthesizers without an operating system. By utilizing direct programming similar to microcontrollers, the project transforms any Pi into a functional 1980s FM synthesizer unit when paired with specific hardware components like an audio board, rotary encoder, and LCD display.
Parts used in the MiniDexed Project:
- Raspberry Pi
- Audio board
- Rotary encoder
- LCD display
We’re used to seeing the Raspberry Pi crop up in a wide range of the projects we show you here, but it’s fair to say that they usually feature some sort of operating system. There’s another way to use a Pi, more akin to using a microcontroller such as the Arduino: by programming it directly, so-called bare-metal programming. MiniDexed is an example, and it copies a classic Yamaha professional synthesiser of the 1980s, by emulating the equivalent of eight of the company’s famous DX7 synthesisers in one unit. It takes almost any Pi, and with the addition of an audio board, a rotary encoder, and an LCD display, makes a ready-to-go unit. Below the break is a video of it in operation.
It’s fair to say that we’re not experts in Raspberry Pi bare metal programming, but it’s worth a diversion into the world of 1980s synthesisers to explore the DX7. This instrument was a staple of popular music throughout the 1980s and was a major commercial success for Yamaha as an affordable FM synthesiser. This was a process patented at Stanford University in the 1970s and subsequently licensed by the company, unlike other synths of the day it generated sound entirely digitally. It’s difficult to overestimate the influence of the DX7 as its sound can be heard everywhere, and it’s not impossible that you own a Yamaha FM synth even today if you have in your possession a sound card.
Curious about the DX7? Master chip-reverse-engineer [Ken Shirriff] exposed its secrets late last year.
Source: BARE METAL GIVES THIS PI SOME CLASSIC SYNTHS
- What is MiniDexed?
It is a bare-metal Raspberry Pi project that emulates eight Yamaha DX7 synthesizers. - How does MiniDexed differ from typical Pi projects?
It uses bare-metal programming directly on the hardware instead of running an operating system. - Can any Raspberry Pi be used for this project?
Yes, the project takes almost any Pi model. - What additional hardware is required to make the unit ready-to-go?
An audio board, a rotary encoder, and an LCD display are needed. - What type of sound generation did the original DX7 use?
The DX7 generated sound entirely digitally using Frequency Modulation (FM) synthesis. - Where was the technology behind the DX7 patented?
The process was patented at Stanford University in the 1970s. - Who exposed the secrets of the DX7 master chip?
Master chip-reverse-engineer Ken Shirriff exposed its secrets.
