Author Archives: grantb4

Kawai R100 QuadROM (x4) Board

It’s important to have a bunch of unfinished projects on the go 😉 so here is one more on my list. If you recall, I sell a PCB for the Kawaii R100 that has three EPROMs on it. This gives … Continue reading

Posted in Kawai R100 | Tagged , , , , | 5 Comments

Yamaha DX7 ROM Cartridge BINs

I needed to get the BIN data from some DX7 cartridges, but I don’t have them all. I only have ROM3. So I desoldered the EPROM in the ROM 3 and compared that to the .SYX files found easily on … Continue reading

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Yamaha DX7 SuperMAX Redux

Something else I’m working on… The new circuit boards just arrived and the testing so far is good. The boards are a slight improvement over the original: I’ve increased the size to allow for a screw to hold the board … Continue reading

Posted in Yamaha DX7 | 11 Comments

Vintage Synth CPU Updates, Upgrades and Expansions

There are so many CPU upgrades now for our beloved synths of old, that I thought it would be nice to have a catalog of them all in one place. If someone else has done this already, please let me … Continue reading

Posted in Pro One CPU, Uncategorized, Yamaha DX7 | 4 Comments

TurboCPU v1.40 (beta) is available

A new version of the TurboCPU+MIDI firmware has been uploaded to the website, along with a new version of the Windows application TurboCPU.exe. Added: “MIDI Note Priority” which supports 4 modes: Lowest Note, Highest Note, Last Note and my original … Continue reading

Posted in Pro One CPU | 1 Comment

MIDI Patch Change Editor v3.31

Ok folks, I have uploaded v3.31 of the PC editor for the MIDI Patch Changer. There are several bugfixes regarding Preset Navigation and the MIDI Events Editor. As well, by popular demand, a “Cancel” button has been added to the … Continue reading

Posted in MIDI Patch Changer | 2 Comments

MIDI Patch Changer: Set Patch Range Hack

Here is a relatively easy hack to let you change how the MPC keypad display MIDI Program Change numbers: as 1-to-128 or 0-to-127. This setting is made available as kind of a “hidden” feature. Hidden in the sense that you … Continue reading

Posted in MIDI Patch Changer | 1 Comment

A Plethora of DX7 Backlit LCDs

I had a chance to grab a bunch of LCD’s for the original Yamaha DX7 and picked up a variety of colors.  They are all really nice and look much better than my photography suggests.

Posted in Yamaha DX7 | 2 Comments

TurboCPU DAC/CV Option – New Parts Source?

I made an interesting discovery on the web today. There are a lot of companies making “Breakout Boards” and “SMT to DIP Adapters” but I’ve never found an assembled one for the MCP4728 DAC used in the TurboCPU’s CV/DAC option … Continue reading

Posted in Pro One CPU | 2 Comments

Time for Kidney Transplant

Hey kids, I’m getting a new kidney.  Wish me luck!  Soldering and programming to resume as soon as I’m able, but I imagine that’s at least a few months away.  

Posted in Kidney Transplant | 3 Comments