Duration: 14:45

Kicking off #MARCHintosh in style, emulating the original Macintosh on a microcontroller.

Huge thanks to Micro Center for sponsoring a series of videos exploring Macintosh history this month!

Mentioned in this video (some links are affiliate links):

 - JCM - PicoMicroMac (v3) hardware: https://jcm-1.com/product/picomicromac/

 - Pico Micro Mac (pico-umac) software for Pi Pico: https://github.com/evansm7/pico-mac

 - PicoMicroMac UF2 Creator: https://picomac.bluescsi.com

 - Eyoyo 5" VGA Monitor: https://amzn.to/4cOULz9

 - 1ft VGA cable: https://amzn.to/4bdaaIq

 - Micro USB to USB OTG cable: https://amzn.to/3OGeXt9

 - Action Retro's video: https://www.youtube.com/watch?v=jYOTAGBqoW0

 - MARCHintosh info: https://marchintosh.com

 - nanofix's video on solder wick: https://www.youtube.com/watch?v=IjOh5ShVX_w

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Pico Micro Mac

01:13 - Some assembly required

02:29 - Firmware and old Mac OS image

03:08 - First boot

04:44 - Exploring old applications and games

10:38 - Exploring the Apple menu

14:11 - Fin!

Duration: 17:33

Lucky for my retro computing hobby, this giant display still handles 640x480 VGA like a champ!

 - Dell UltraSharp 52 U5226KW: https://www.dell.com/en-us/shop/dell-ultrasharp-52-thunderbolt-hub-monitor-u5226kw/apd/210-bthw/monitors-monitor-accessories

 - Mac Server G4/733: https://everymac.com/systems/apple/mac_server_g4/specs/macserver_g4_733_qs.html

Dell sent this monitor to me for testing; I mark the video as 'sponsored' because I did not pay for all the hardware in the video. Dell did not have any say over the content of this video, nor have any chance to review it prior to publication.

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Contents:

00:00 - Quicksilver

03:42 - VGA Shenanigans

06:26 - A more reasonable computer (GB10 via DisplayPort)

08:29 - As big as a walrus (setting it up)

09:25 - Gaming in 6K (on Arm Linux)

11:34 - Two displays, one monitor

12:24 - Three displays, one monitor (adding Thunderbolt)

14:37 - Multi-monitor setups

16:38 - Power consumption

Duration: 12:25

Problems scale linearly, performance does not.

 - Video on Exo on M3 Ultra Mac Studio cluster: https://www.youtube.com/watch?v=x4_RsUxRjKU

 - Video on Dell Pro Max with GB10 Mini PC: https://www.youtube.com/watch?v=FjRKvKC4ntw

 - Video on Framework Desktop Cluster: https://www.youtube.com/watch?v=N5xhOqlvRh4

 - My YouTube repo on GitHub: https://github.com/geerlingguy/youtube

The Mac Studios in this video were provided for testing by Apple, so I'm marking this video as 'sponsored'. As with the last video, they did not pay for this video nor have any input into its contents.

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Duration: 04:37

Time Station Emulator: https://timestation.pages.dev

And the source code is here: https://github.com/kangtastic/timestation

Other things I used in this video (some links are affiliate links):

 - HydraSDR: https://hydrasdr.com

 - Nooelec Ham It Up: https://amzn.to/49NLUfr

 - GQRX: https://www.gqrx.dk

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Time Station Emulator

01:07 - SDR test setup

02:11 - Let's get phreaky

Duration: 05:59

For some projects, I don't need my bench power supply anymore.

Some of the things I mentioned in this video (some links are affiliate links):

 - Werewolf VFLEX DIY Bundle: https://werewolf.us/collections/werewolf-products/products/vflex-diy-adapter

 - Werewolf VFLEX kit: https://werewolf.us/collections/werewolf-products/products/vflex-3-pack-starter-kit

 - DIY clock kit for practice soldering: https://amzn.to/4bW2gUr

 - Big Clive's clock video: https://www.youtube.com/watch?v=0hwWnPxKU14

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - USB-C PD for all electronics

01:24 - DIY Clock I found through Big Clive

02:39 - Programming the VFLEX

03:58 - Testing the VFLEX

04:49 - Moment of truth

Duration: 16:18

My PreSonus Eris E3.5 speakers starting having issues. First with loud sound, then whenever I turned them on.

The click-click-click WUB WUB WUB was not very pleasant. So I took them apart, and found the problem!

My old speakers (PreSonus Eris E3.5): https://amzn.to/3LVd3DY

My new speakers (PreSonus Eris E5 x2): https://amzn.to/4bUArvL

My audio interface (Behringer UMC202HD): https://amzn.to/3ZzpUie

Tools I used for the repair (note: some things you don't *need*, it just makes things easier)

 - Hakko FR-301 Desoldering Gun: https://amzn.to/45wW6Xb

 - Hakko 633-01 Soldering Iron Holder: https://amzn.to/4pYuEsA

 - ISO-TIP Model 8000 Cordless Soldering Iron: https://amzn.to/45zu7G9

 - Kester 44 Solder wire: https://amzn.to/4t5KUuI

 - Hakko CHP PN-2007 Long-nose Pliers: https://amzn.to/46f0UAx

 - Dowell Micro Flush Cutters: https://amzn.to/3YWH7SD

 - Hakko CHP PN-20-M Micro Pliers: https://amzn.to/4akwDlp

And the capacitor that was needed for the repair: 24V 1000µf (I used a 35V 1000µf). This kit has a suitable replacement: https://amzn.to/4bT0aVs

As an Amazon Associate I earn from qualifying purchases.

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - The speaker on the bench goes wub wub wub

01:00 - Bulging caps

02:07 - Not taking apart, breaking apart

03:40 - Glued and screwed

04:51 - The connectors do not come off

06:21 - Pop a cap (or two)

09:22 - New cap is a bit wide

11:10 - Reassembly

13:00 - Will it explode?

14:04 - Moment of truth (and YouTube Jazz)

Duration: 16:37

I waited far too long to buy one of these portable oscilloscopes.

The FNIRSI 2C53T is $90 on Amazon: https://amzn.to/49BxVJA (Amazon affiliate link)

Here are the other videos I referenced:

 - Branchus Creations' overview of the 2C53T: https://www.youtube.com/watch?v=RyU4aKOZWcY

 - Matthias Wandel's review of the DPOS350P: https://www.youtube.com/watch?v=dcexJ4CTvOg

 - My previous video on the Pico GPS clock: https://www.youtube.com/watch?v=w_EJMtji93g

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - FNIRSI 2C53T

01:45 - Testing timing

03:05 - Probe setup

04:54 - Triggering on nanoseconds

07:22 - Cable length matters

08:45 - Quick summary of the oscope

09:31 - 3D printed clock LCD filter update

10:09 - Testing the signal generator (sine wave)

12:12 - Other waveforms

14:02 - When 1 Hz is actually 2 Hz

Duration: 08:34

Check out my time-pi project for full details: https://github.com/geerlingguy/time-pi

And the previous video on this mini rack 1U Pico GPS clock project: https://www.youtube.com/watch?v=E5qA4fgdS28

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Contents:

00:00 - Upgrading the Pico GPS clock

00:26 - PPS via LED

02:15 - PPS bodge to GPIO 16

03:16 - LCD's too bright

04:09 - UV tint and plastic tape filter

06:01 - 3D printing an integrated filter

07:45 - Any other ideas?

Duration: 13:20

I wanted the most accurate clock possible in my mini rack. But nobody makes clocks for mini racks!

So I made my own.

Parts required for this clock build (some links are affiliate links):

 - Waveshare L76K GNSS Module for Pi Pico: https://amzn.to/4nKlL5J

 - Adafruit 0.56" 4-Digit 7-Segment Display w/I2C Backpack: https://www.adafruit.com/product/879

 - Raspberry Pi Pico 2 (with Headers): https://www.raspberrypi.com/products/raspberry-pi-pico-2/

  - If you don't have the 'with Header' version, solder on 2x 20 pin headers: https://amzn.to/4jClLn1

 - Waveshare L76K GNSS Module for Pico: https://amzn.to/4qgiFaQ

 - 15cm jumper wires: https://amzn.to/4aT5jwj

 - 1220 3V Lithium coin cell battery: https://amzn.to/3YzptnL (if you want RTC clock holdover)

 - M2x6mm screws: https://amzn.to/45NaeLM (optional, to hold the display in securely)

Full instructions and code on GitHub, in my time-pi project:

https://github.com/geerlingguy/time-pi/tree/master/pico-clock-mini-rack

3D design files for printing are on Printables:

https://www.printables.com/model/1549682-pico-gps-clock-1u-mini-rack-faceplate

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - A Pico GPS Clock

02:34 - Modeling a 1U mini rack panel

05:59 - Clock face extrusion

07:19 - V3 and day two

08:22 - V4 clock and Pico fitment

10:17 - Debugging the clock

11:17 - LCD Lenses and Kapton test

12:25 - PPS and 1U mini rack

Duration: 04:25

See my comparison video last year, when the Mini PC was cheaper: https://www.youtube.com/watch?v=TORg5FhKf-4

And Happy New Year! Hope the rest of 2026 has more happy news, lol.

Prices were taken from Micro Center (as I could go to the store today and buy the hardware at that price immediately), or from Amazon product listings that are able to ship in 2 days or less.

If you want to support the channel, Amazon will give me 2.5% back on your purchase of the GMKTec mini PC (note: GMKtec offered me a 10% commission, but I don't participate in any manufacturer's commission-based marketing!): https://amzn.to/4bhsi4e

But I'd recommend buying some used hardware or using what you have already for now ;)

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Duration: 03:09

New York City's 2026 Inauguration Block Party singled out Raspberry Pi and Flipper Zero in their 'Prohibited Items' list.

I'm in St. Louis and won't be going there anyway, so it doesn't impact me, but I thought this was funny, and slightly alarming (they don't single out particular gun manufacturers, just 'guns', so why the Pi?).

But here's the prohibited items list: https://www.transition2025.com/inauguration#faqs (under "What Should I Wear and What Should I Bring?").

And here are two articles on the topic:

 - Adafruit: https://blog.adafruit.com/2025/12/30/nyc-mayoral-inauguration-bans-raspberry-pi-and-flipper-zero-alongside-explosives/

 - The Register: https://www.theregister.com/2025/12/31/zohran_mamdani_raspberry_pi_ban/

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Duration: 18:07

Find out more about the Switchberry: https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/715

And let me know what you think of this style of video? I just clamped my camera to a monitor mount on my desk, and away I went! Merry Christmas, and Happy New Year!

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Contents:

00:00 - Hello Switchberry

02:43 - Assembly - Heatsets and CNC Kitchen's tips

08:56 - Assembly - Installing the PCB

12:44 - Assembly - Screwing on the bottom

14:56 - Assembly - Rubber feet

16:18 - It's assembled!

Duration: 04:45

My original review (titled, "A RISC-V Stick-on"):

- YouTube: https://www.youtube.com/watch?v=riDd6d0Vmy0

- Blog: https://www.jeffgeerling.com/blog/2024/sipeed-nanokvm-risc-v-stick-on

Here's the article everyone's been linking for the past few days: https://telefoncek.si/2025/02/2025-02-10-hidden-microphone-on-nanokvm/

And a few good discussions:

- Hacker News: https://news.ycombinator.com/item?id=46173383

- Level1Techs: https://forum.level1techs.com/t/nanokvm-l1-os/215414/19?u=geerlingguy

- GitHub: https://github.com/sipeed/NanoKVM/issues/301

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Duration: 06:52

Apple could make a ton of money building little external touch ID sensors, or licensing the tech to keyboard manufacturers. Why don't they?

 - Snazzy Labs' video: https://www.youtube.com/watch?v=hz9Ek6fxX48

 - Model I used: https://www.printables.com/model/355924-clickable-touch-id-box-tkl-board-wired#instructions

 - The M1.2 Screw set I used: https://amzn.to/48xqYYe

 - The M1.2 Nut set I used: https://amzn.to/4ozzb43

 - Hakko curved-tip tweezers: https://amzn.to/443cldQ

 - iFixit Mako Screwdriver kit: https://amzn.to/4iBGRkL

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Touch ID

00:44 - Torn down

04:00 - Transformed

06:11 - Tested

Duration: 06:04

Thanks to commenters on my other video, my old Temtop CO2 monitor lives again!

Resources / other things I mentioned in this video (some links are affiliate links):

 - Air Lab video: https://www.youtube.com/watch?v=r21lvaw40nY

 - Temtop M2000C Air Quality Monitor: https://amzn.to/3Mkn4dv

 - CR1220 battery pack: https://amzn.to/4oSAFqY

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - CO2 wasn't working anymore

01:42 - Replacing the CR1220 battery

03:09 - Did it work?

04:24 - Repairability is really nice

04:48 - I say what I want

Duration: 11:37

Screaming server racks right in the middle of the show floor.

If that's not a good time, I don't know what is. Supercomputing 25 was a great experience, and can't-miss for me, since it was right in my back yard this year :)

A few of the highlights of the show, that I mentioned here:

 - EPCC's Wee Archie Pi cluster: https://www.epcc.ed.ac.uk/whats-happening/articles/wee-archie-earns-its-wings

 - Student Cluster Competition: https://sc25.supercomputing.org/students/student-cluster-competition/

 - IndySCC: https://sc25.supercomputing.org/students/indyscc/

 - Dolphin PCIe Interconnect box: https://www.dolphinics.com/products/eBox_5.html

 - SCinet: https://sc25.supercomputing.org/scinet/

Huge thanks to the various folks who talked to me throughout the conference. I got to learn a lot from the HPC community, and even met many of the folks I interact with online for the first time in person!

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Supercomputing in STL

00:31 - Wee Archie, the 18-node Pi Cluster for learning

02:42 - IndySCC - Student clusters in the cloud

04:20 - SCC - Student Cluster Competition

06:05 - PCIe everywhere

06:27 - Dolphin's SR-IOV demo sharing PCIe devices with many PCs

09:18 - 13.75 Tbps through SCinet

Duration: 16:46

It's not always easy. But at least I'm learning!

If you want to read more about what happened in my HPL benchmarks on the Radxa Orion O6 and Minisforum MS-R1 with the Cix P1, read the following issues:

 - https://github.com/geerlingguy/top500-benchmark/issues/54#issuecomment-3518813579

 - https://github.com/geerlingguy/top500-benchmark/issues/82#issuecomment-3514084323

And I've since updated my blog post with the new HPL performance and efficiency numbers: https://www.jeffgeerling.com/blog/2025/minisforum-stuffs-entire-arm-homelab-ms-r1

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Benchmarking is kind-of hard, actually

01:50 - Methodology and results in the open

04:02 - Big, Medium, Little cores

05:34 - Fixing what's wrong

06:49 - Reproducible benchmarks and power monitoring

09:03 - Arm vs x86 benchmarking

09:50 - Firmware on the O6

11:11 - Annoying case and cooling with a copper shim

13:34 - Lockups and slowing things down

14:28 - What went wrong

Duration: 08:20

Crossover Preview finally supports Arm64 Linux, so you can run (some of) your favorite x86 Windows games on Linux more easily.

Check out their blog post about it here: https://www.codeweavers.com/blog/mjohnson/2025/11/6/twist-our-arm64-heres-the-latest-crossover-preview

See my previous coverage of the two system I tested in this video:

 - System76 Thelio Astra: https://www.youtube.com/watch?v=AshDjtlV6go

 - Minisforum MS-R1: https://www.youtube.com/watch?v=WXfd0rOOtkg

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - What is Codeweavers' CrossOver?

01:01 - Testing it on a Thelio Astra and MS-R1

01:58 - Testing Cyberpunk 2077

02:55 - Can it run Crysis?

04:02 - The purpose

04:39 - Repurposing old tech

05:29 - It's still buggy

07:08 - Jeff goes on a tangent about the keyboard

Duration: 18:48

I copied my video footage to the wrong place, deleted it off my Sony camera's SD card, then deleted it from my local computer as well. Can I restore the MP4 video files, or are they toast?

All the info in this video is up on my blog as well—check there for the latest links and any future additions:

https://www.jeffgeerling.com/blog/2025/recovering-videos-my-sony-camera-i-stupidly-deleted

Here are the resources mentioned in this video:

 - Basic photorec guide: https://www.jeffgeerling.com/blog/2019/rescue-photos-and-other-files-sd-or-microsd-card-photorec

 - Untrunc (anthwlock's fork): https://github.com/anthwlock/untrunc

 - Ponchio's guide to MP4 files: https://vcg.isti.cnr.it/~ponchio/untrunc.php

 - mp4fixer: https://github.com/bookkojot/mp4fixer

 - Disk Drill: https://www.disk-drill.com

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

Main Channel: https://www.youtube.com/@JeffGeerling

2nd Channel: https://www.youtube.com/@GeerlingEngineering

Contents:

00:00 - Oops I did it again

02:02 - photorec scrubs for deleted files

02:58 - MP4 atoms and Sony XAVC moov.mov

04:57 - What I should've done first - dd

07:17 - untrunc to restore MP4

09:47 - Researching MP4 file structure and brute-forcing untrunc

12:42 - Sometimes you just have to pay the piper

14:21 - Disk Drill's advanced camera recovery module

15:55 - Lessons learned

Duration: 12:41

Thermal Master sent me a P3 to test, and test it I shall! What's your favorite way of measuring thermals?

Mentioned in this video (some links are affiliate links):

 - Thermal Master P3: https://amzn.to/48xbUvb

 - Topdon TC004: https://amzn.to/3Lcrlz7

Support me on Patreon: https://www.patreon.com/geerlingguy

Sponsor me on GitHub: https://github.com/sponsors/geerlingguy

Merch: https://www.redshirtjeff.com

2nd Channel: https://www.youtube.com/@GeerlingEngineering

3rd Channel: https://www.youtube.com/@Level2Jeff

Contents:

00:00 - Lights out!

00:24 - What's in the box

01:51 - Demo and emissivity exploration

05:18 - Focus and macro for PCB inspection

08:16 - Temp Master App walkthrough

11:33 - Price and recommendations