Anil Natha anilnatha

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

iPad Pro 12.9" (2020) Magic Keyboard Portrait Mode DIY Smart Connector Cable

I wanted my iPad Pro to be able to use the Magic Keyboard in portrait mode, but the current Smart Connector configuration does not allow this. With too much time on my hands, I made a short jumper cable using a section of USB cable, 5-pin POGO connectors (the 5-pin works using pins 1, 3, and 5, and removing pins 2 and 4), a small electrical project box, 3mm N52 magnets, and some epoxy and Sugru to pack everything into place. My cable and connections orientation had more to do with the boxes I found to encase the connector (with holes on the small end) than anything else. Obviously, there will be many ways to do this.

WARNING: Getting any of these steps wrong will probably ruin your iPad.

Note: These measurements are for the 12.9" (2020) model. The magnets did not line up and the polarity was different for my wife's iPad Pro 11" (2021).

![iPad-Pro-MmagicKeyboard-Jumper-Cable-min](https://user-images.githubusercontent.c

Change Git Commit Date

Commit your git using

git add -A
git commit -m "commit message"

Change time or date of your latest commit

GIT_COMMITTER_DATE="Wed Sep 9 22:00 2020 +0530" git commit --amend --date="Wed Sep 9 22:00 2020 +0530"

A common name for the interface is HUB75

The displays use shift registers for columns and two sets of row multiplexers.

Typical organization

32x32 panel

Organized in two halfs of 16x32 tiles
32 bit long RGB column drive shift registers
4 bit to 16 row drive demultiplexers

demo terraform module

A terraform module to provide a in AWS/AZURE/ETC,ETC.

This should be used an a generic template to be included in every terraform module.

Module Input Variables

Using `<details>` in GitHub

Suppose you're opening an issue and there's a lot noisey logs that may be useful.

Rather than wrecking readability, wrap it in a <details> tag!

<details>
 Summary Goes Here

	#!/bin/bash
	# Raspberry Pi stress CPU temperature measurement script.
	#
	# Download this script (e.g. with wget) and give it execute permissions (chmod +x).
	# Then run it with ./pi-cpu-stress.sh
	#
	# NOTE: In recent years, I've switched to using s-tui. See:
	# https://github.com/amanusk/s-tui?tab=readme-ov-file#options

	# Variables.

	def site_authors(request):
	return Author.objects.filter(site_id=request.site.id)

	class Authorships(Orderable, models.Model):
	author = models.ForeignKey('Author', related_name='author_paper_relationship', on_delete=models.CASCADE)
	paper = ParentalKey('Page', related_name='paper_author_relationship', on_delete=models.CASCADE)

	panels = [
	SnippetChooserPanel('author', qs_restriction=site_authors, editable=False)
	]

	@register_snippet
	class Author(models.Model):
	first_name = models.CharField(max_length=128)
	last_name = models.CharField(max_length=128)
	site = models.ForeignKey('wagtailcore.Site', on_delete=models.CASCADE)

	panels = [
	MultiFieldPanel([
	FieldPanel('first_name', classname='col6 first-name'),
	FieldPanel('last_name', classname='col6 last-name'),

	class MyModel(models.Model):
	onefield = models.CharField('The field', max_length=100)
	class MyModelAdmin(admin.ModelAdmin):
	def has_add_permission(self, request):
	# if there's already an entry, do not allow adding
	count = MyModel.objects.all().count()
	if count == 0:
	return True
	return False