Category Archives: Notes

Specs for M5 Pro MacBook Pro

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My IRC friend @ngoldbaum got a new MacBook Pro and I was reading about about the specs over here: Apple introduces MacBook Pro with all‑new M5 Pro and M5 Max, delivering breakthrough pro performance and next-level on-device AI.

One feature which jumped out at me was the insanely fast memory bandwidth. This “unified” memory is on the CPU die and shared between CPU and GPU, which, apparently, can eliminate duplication. The M5 Pro supports up to 307 GB/s and the M5 Max supports up to 614 GB/s.

Electronic components to avoid in a product

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In this latest video from John Teel, electronic components to avoid in a real product:

  1. USB Micro-B Connections → use USB-C instead
  2. Through-Hole Components → use SMD instead
  3. Barrel Jack Power Connections → use USB-C instead
    • Note: 5.5 × 2.1 mm (5.5×2.1mm) is the common DC barrel jack size, 5.5 × 2.5 mm (5.5×2.5mm) is less common
  4. Unshielded DC-DC Converter Inductors → use shielded inductors instead
  5. Cheap No-Name Electrolytic Capacitors → buy from reputable brand instead, or, better, switch to ceramic or polymer aluminium capacitors
    • If you want no surprises, stick to: Nichicon, Rubycon, Panasonic, Nippon Chemi-Con (aka United Chemi-Con), Elna
    • For professional/industrial designs, also consider: KEMET, Vishay, TDK
  6. Bare Pin Headers as Production Connectors → use connectors rated for your application instead
  7. Mechanical Relays → use solid state instead, for DC consider MOSFET
  8. Single-Source or End-of-Life Components → use widely available components instead
  9. Counterfeit of Clone ICs → buy from authorized distributors instead:
  10. Hobby-Grade Sensors → look for higher grade instead with I2C or SPI digital interfaces

Git Commands to Run Before Reading Any Code

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Via Hacker News today was The Git Commands I Run Before Reading Any Code. I made a git-rep.sh script based on these:

#!/bin/bash

# 2026-04-09 jj5 - SEE: https://piechowski.io/post/git-commands-before-reading-code/

main() {

  set -euo pipefail;

  report 'What Changes the Most';
  git log --format=format: --name-only --since="1 year ago" | sort | uniq -c | sort -nr | head -20;

  report 'Who Built This';
  git shortlog -sn --no-merges;

  report 'Where Do Bugs Cluster';
  git log -i -E --grep="fix|bug|broken" --name-only --format='' | sort | uniq -c | sort -nr | head -20;

  report 'Is This Project Accelerating or Dying';
  git log --format='%ad' --date=format:'%Y-%m' | sort | uniq -c;

  report 'How Often Is the Team Firefighting';
  git log --oneline --since="1 year ago" | grep -iE 'revert|hotfix|emergency|rollback';

}

report() {

  echo;
  echo "$1":
  echo;

}

main "$@";