Page 19 — Daniel Cosenza's Blog — Daniel Cosenza's Blog

macOSDeep Dive June 19, 2026 4 min read

Automating macOS with launchd Agents and Daemons

A practical guide to writing, installing, and debugging your own scheduled or persistent launchd jobs.

#launchd#automation#macos

RetrogamingDeep Dive June 19, 2026 3 min read

Emulation vs. Virtualization: Two Different Ways to Run Foreign Software

Both let you run software that wasn't written for the machine in front of you — but one translates between two different instruction sets, and the other doesn't translate at all.

#emulation#virtualization#architecture

RetrogamingDeep Dive June 17, 2026 3 min read

CRT Shaders and Integer Scaling: Making Old Pixels Look Right on New Screens

A 256x224 image was never meant to be seen as a grid of hard, discrete pixels. Recreating how it actually looked on the display it was designed for is its own genuine technical problem.

#shaders#crt#scaling

LinuxDeep Dive June 16, 2026 3 min read

Reading /proc and /sys: The Kernel's Window into Userspace

How procfs and sysfs expose live kernel state as ordinary files, and the specific paths worth knowing for debugging a running system.

#proc#sysfs#kernel

RetrogamingDeep Dive June 15, 2026 3 min read

ROM Dumping and Preservation: From Cartridge to File

A ROM file isn't downloaded into existence — it's read directly off the memory chips inside a real cartridge, with the same care a museum takes digitizing a fragile original.

#rom-dumping#preservation#retrogaming

FreeBSDDeep Dive June 13, 2026 3 min read

FreeBSD Networking Internals: Interfaces, Routing, and netstat

How FreeBSD names and configures network interfaces, manages routing tables, and exposes the tools to inspect both.

#networking#routing#sysadmin

RetrogamingDeep Dive June 12, 2026 4 min read

Rollback Netcode: How Online Fighting Games Hide Latency

The internet has unavoidable latency. Rollback netcode doesn't eliminate it — it hides it, by having both players simulate a guessed future and quietly correcting the guess when reality disagrees.

#netcode#rollback#multiplayer

macOSDeep Dive June 10, 2026 4 min read

macOS App Sandboxing and Entitlements Explained

How the App Sandbox confines what an application can access by default, and how entitlements grant it specific, narrow exceptions.

#sandboxing#entitlements#macos

RetrogamingDeep Dive June 10, 2026 3 min read

Inside Libretro: The Core/Frontend Architecture Behind RetroArch

RetroArch supports dozens of systems without reimplementing shaders, netplay, or rewind for each one — because the emulator logic and everything around it are deliberately different programs.

#libretro#retroarch#architecture

RetrogamingDeep Dive June 8, 2026 3 min read

How Save States Work: Serializing an Entire Virtual Machine to Disk

A save state isn't a save file — it's a snapshot of literally everything, taken mid-execution. That distinction is why it's so powerful, and why it's so fragile across versions.

#savestates#emulation#retrogaming