[sdiy] MIDI velocity

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


>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.


The information contained in this e-mail message is privileged and confidential and is for the exclusive use of the addressee. The person who receives this message and who is not the addressee, one of his employees or an agent entitled to hand it over to the addressee, is informed that he may not use, disclose or reproduce the contents thereof, and is kindly asked to notify the sender and delete the e-mail immediately.

More information about the Synth-diy mailing list