Human folly for 02017-04-18

older newer index

• USB2 (beyondlogic.org):

  #USB #hardware data rates and tolerances: low speed data is 1.5Mbps ±1.5% so you can use a crystal resonator or even maybe a calibrated ATMega RC oscillator; full-speed is 12 ±0.25%.

• USB lowspeed (compuphase.com):

  more on #USB #hardware and in particular using microcontrollers for low-speed USB

• 2017 03 13 meet BeagleBone blue (beagleboard.org):

  the BeagleBone Blue #hardware has a 1GHz Cortex-A8, two 200MHz “programmable real-time units”, half a gig of RAM, four gigs of Flash, batteries, motor controls, quadrature inputs, Wi-Fi, Bluetooth, #BLE, and supports Debian, ROS, Ardupilot, etc.

• Soclibrary (gaisler.com):

  GRLIB is Cobham Gaisler’s GPL #hardware with LEON3 SPARC, SDRAM, PCI, USB, CAN, etc., with a common on-chip bus

• CPUs pdp8 (github.com):

  Verilog #hardware for a PDP-8/i that can boot TSS/8.

• Keccak tiny (github.com):

  another tiny public-domain #Keccak #SHA-3 #crypto hash in 120 “lines” of C, derived from a Twitter account, #simplesha3 I think. #smallisbeautiful

• Interactive coding challenges (github.com):

  #Algorithms in Python, with Jupyter notebooks for practicing programming them in. “Challenges focus on algorithms and data structures found in coding interviews.”

• Ingalls 2014 smalltalk78 (freudenbergs.de):

  #PDF of #paper “Reviving Smalltalk-78: the First Modern #Smalltalk Lives Again” #history #retrocomputing

• Index (dmitry.gr):

  bitbanging Bluetooth Low-Energy (#BLE) outputs at least, using the Nordic nRF24L01+ #hardware