[sdiy] MIDI velocity

Ullrich Peter Peter.Ullrich at kapsch.net
Wed Apr 6 21:47:33 CEST 2016


Hi!

>All of my (our?) favorite vintage synthesizers were designed with 8-bit processors like the 6800, Z-80, or 8049/8051 running at about 1 MIPS. They usually had a few 8-bit ports and all >use a switch matrix for the keyboard. Some of the Technical Service Manuals actually mention the exact scan rate, and it's usually on the order of 1 millisecond. That's for non-velocity->sensitive keyboards, so perhaps the scan rate is higher for velocity. It would be interesting to find a Service Manual for a velocity-sensitive keyboard that actually describes >the scan rate. My experience is with really old keyboards, so if anyone has pointers to this information on velocity synths, I'd appreciate it!

The Crumar bit one uses a 8051 chip for the keyboard scanning and the has velocity.
The scan rate is about 1000Hz. I measured the rate once in my Crumar Masterkeyboard (that uses the same 8051 chip) when I had problems.

Ciao
Peter



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