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Didn't start a new adventure yet, but continued an old one a bit... went and did some reading and configuring - now the memory protection unit, or MPU to friends, is working for the money, enforcing the user/supervisor split as it should. Now you can't just run a program that zero-fills memory...

I'm interested in the information this conclusion is based on. Could you provide links?

I was (and am) surprised by the I/O speed and the overall snappiness of it. I haven't benchmarked the raw SD card access speed, but even when writing a single large file to the filesystem (read: with the filesystem layer making things slower) I'm getting 6-7 megabytes per second.When I'm running...

Then almost none of the '70s Unixes are "real deal" either. Ditto for all of the PC Unix ports of the early '80s etc. If your "real deal" criteria is demand paging, then the real Unix history starts at 3BSD.

I'm not sure there are any, unless you're already familiar with it. This is more of an exercise in futility than anything else - though I have to admit that it does perform way better than I expected.

Now we are booting to multi-user mode, need to hook up another UART. Repository needs attention, I've been hacking together horrible code to get to this point, general idea being "I'll clean it later". There's a slight glitch in the UART driver still - I have hooked up a button to the board so I...

DiscoBSD 2.3-current (TEENSY35) #2 588: Fri Nov 29 11:17:32 EET 2024 esp@tieteislaskin:/sys/mk64/teensy35 cpu: Kinetis K64, 120 MHz, bus 60 MHz mpu: enabled, 12 regions mpu: region 0: 0x00000000-0xffffffff flags 0x0061f7df oscillator: oscillating uart1: found, 64 tx/64 rx bytes FIFO...

Sorry, but it's dead now.

Noise being modulated by bus activity is quite common - when I build things on my work laptop, I can tell by the sound when the build is finished.

What is the scale of the graph? The code is all int but I'm seeing decimals. Are we jumping back and forth by 2 LSB, full scale or something else? Let's focus on the modulation and aftertouch first. Do these work completely satisfactorily now? Let me expand a bit... By setting the analog read...

Okay, we're definitely multitasking now. 20241123 03:32:07 connected to /dev/ttyACM0 press C-z q to exit DiscoBSD 2.3-current (TEENSY35) #109 576: Sat Nov 23 03:31:54 EET 2024 esp@tieteislaskin:/sys/mk64/teensy35 cpu: MK64FX512, 120 MHz, bus 60 MHz, MPU enabled, 12 regions mpu...

You meant int16_t

First, a disclaimer: I'm doing this for fun, not because it made any particular sense. For background, I've dabbled with embedded systems as a hobby for some time. I've mostly made things that work together with my modular synthesizer setup. Lately I've been working on a one-hand chording...