The wonderful, perplexing MFB-503

Ah, MFB. Maker of wonderful instruments and usually bewildering user interfaces. Today we look at the MFB-503 Drumcomputer To start, press play. My unit seems to sometimes set the tempo of empty patterns to zero causing the pattern to appear to not play. Each pattern has an a and a b section. To select a …

Booting an Asus x200ca from USB

Here is the procedure to boot an Asus x200 (x200ca in my case) from USB (ie. to install Linux on it). While booting, press F2 to enter the bios Go to the “Security” tab and disable “secure boot” In the boot tab, enable CMS and Enable PXE boot In the boot tab, disable fast boot …

Modifying and rebuilding an RPM from source

This is a topic covered over and over on the internet and yet I can never find the quick guide I need. Here for my notes are how to modify and rebuild an RPM from source. First, download the SRPM and install it: You may see some errors about groups, you can ignore these. You …

Finding an expired certificate

I had a strange issue today regarding a particular expired certificate on a webserver. The problem was that the server in question was an nginx reverse proxy that proxied many domains and contained many hundreds of certificates. For various, um, “technical reasons”, I could not locate the exact cert that was bad. I only knew …