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Category Archive: Macs

Firmware updates for macOS Tahoe, Sequoia and Sonoma

Details of new firmware versions for iMac 2019 models, those with T2 or Apple silicon chips. And how Apple assigns version numbers to iBoot.

February 18, 2026 Macs, Technology

Apple has just released updates to XProtect and XProtect Remediator

Apple has just released updates to XProtect for all supported versions of macOS, bringing it to version 5330, […]

February 17, 2026 Macs, Technology, Updates

In the background: Putting threads to work

From a simple linear Basic program, or a command tool like tar, to working with macOS to get threads allocated to the most appropriate cores and run at the right frequency.

February 17, 2026 Macs, Technology

Solutions to Saturday Mac riddles 347

I hope you enjoyed Saturday’s Mac Riddles, episode 347. Here are my solutions to them. 1: Stop operating […]

February 16, 2026 General, Macs, Technology

An illustrated guide to Recovery on Apple silicon Macs 2.0

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Step by step through all the features, some undocumented by Apple. Two different Recovery Assistants, Repair Assistant, Erase Mac, Startup Security Utility, change settings and more.

February 16, 2026 Macs, Technology

Last Week on My Mac: Repair Assistant has replaced Diagnostics

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Last September, Tahoe replaced Apple Diagnostics with a new and improved suite of tests for Apple silicon Macs. No one seems to have noticed, least of all Apple.

February 15, 2026 Macs, Technology

Saturday Mac riddles 347

Here are this weekend’s Mac riddles to entertain you through family time, shopping and recreation. 1: Stop operating […]

February 14, 2026 General, Macs, Technology

Explainer: % CPU in Activity Monitor

It’s the percentage of time a core in active, when not idle or shut down. That’s confounded by Intel Hyper-threading, and frequencies of Apple silicon cores.

February 14, 2026 Macs, Technology

Friday Magic: See real log entries

How to remove all the privacy redactions, and reveal network diagnostics including the URLs connected to by your Mac.

February 13, 2026 Macs, Technology

In the background: software update, backup & XProtect Remediator

After logging in, macOS may check for system software updates, run an initial Time Machine backup, and run XProtect Remediator scans. This is how those happen.

February 12, 2026 Macs, Technology

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