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Retro Theory

@retrotheory.bsky.social
2.8K followers 112 following 92 posts

Playing with old computers, breaking them, maybe fixing them.

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Retro Theory @retrotheory.bsky.social · 07/05/2026
Pico-mac with audio has been published github.com/retrotheory/... This is for Pico 2, not tested on Pico 1. PWM or DAC based audio configure at build time. Includes work on the submodule github.com/retrotheory/... ,updated for 464K support and patched audio addressing.
Common DAC, can add crystal clear audio to pico-mac
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Retro Theory @retrotheory.bsky.social · 03/05/2026
PicoMac Pico2 / 464K with Audio Patched the ROM too override of memory size, and skip memory test. Audio Output is 8bit PWM at 22,254 Hz, One sample per scanline, 3-bit volume control (0-7) via VIA Port A bits 0-2 With 464K I had to do shenanigans to get sound buffer in 'right place'
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Retro Theory @retrotheory.bsky.social · 04/04/2026
Ok, I have brought BigMaclock to After Dark screensaver github.com/retrotheory/... Thanks @paulrickards.bsky.social for the AD idea and thanks @kalleboo.bsky.social for pointer on what I was doing wrong. Now with Inversion Timer (phosphor protection) Thanks for idea @thetechknight.bsky.social
Mac Plus running After Dark, with the BigMaclock screen saver module
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Karl Baron @kalleboo.bitbang.social.ap.brid.gy · 01/04/2026
And here it is, the #MARCHintosh #GlobalTalk Canvas timelapse. Thank you to everyone who participated, it was lots of fun to host!
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Retro Theory @retrotheory.bsky.social · 31/03/2026
Failing hard at this, trying to convert my BigMaclock to screensaver module for After Dark and I cannot get it to animate/update , so it just shows the static time. I think I'm right setting Cals 1 resource to 0x0f , but I think AD is catching quickdraw updates , need to find more info
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K-man @kman-aus.bsky.social · 13/03/2026
Reviving a sad Macintosh Plus for #MARCHintosh and its 40th. Playing games, exploring drives, letting it moonlight as a big Maclock, and hopping online with a BlueSCSI. Watch - youtu.be/qFYbTqF4pmM
A sad Mac icon with error code 01001C overlayed on an image of a Macintosh Plus setup with keyboard, mouse, external hard drive and FloppyEmu.  The Mac has a smiley face.  Off to the sides you see soldering gear and an EPROM programmer.
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vlado @mejs.eurosky.social · 17/03/2026
I love to check the time on my SE/30, courtesy of @retrotheory.bsky.social's BigMaclock 😎 github.com/retrotheory/... #marchintosh
Compact Mac showing time
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Retro Theory @retrotheory.bsky.social · 17/03/2026
Source code added github.com/retrotheory/...
github.com
GitHub - retrotheory/BigMaclock: A desk clock for the Macintosh
A desk clock for the Macintosh. Contribute to retrotheory/BigMaclock development by creating an account on GitHub.
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Retro Theory @retrotheory.bsky.social · 16/03/2026
Sometimes my Macs just wont Appletalk to each other. SE/30 gets quite cross with its older sibling. #MARCHintosh
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nulleric @eric.scsi.blue · 15/03/2026
Mac DOOM on an SE/30 tinkerdifferent.com/threads/rele... cc: @actionretro.bsky.social #MARCHintosh
DOOM on an SE/30
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Retro Theory @retrotheory.bsky.social · 12/03/2026
Another #MARCHintosh project, a serial digital multimeter logger , in this case a UT61E. Its very work in progress and tough work for the 68000 of the Macintosh Plus.
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techknight @thetechknight.bsky.social · 06/03/2026
My First #MARCHintosh video of the Year is out! youtu.be/rjN4kAmt8WQ?...
youtu.be
One man's trash: The journey of neglected compact Macs
YouTube video by THEtechknight
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Retro Theory @retrotheory.bsky.social · 04/03/2026
More on what @mac84.bsky.social suggested, temp being a weather symbol. Making a weather symbol in 5x7 'pixels' is kinda meh. So I though make it the same width as the DAY, so 18x11. It needs some work , not bad for first pass. At the moment , its click to change. And saves to prefs.
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Retro Theory @retrotheory.bsky.social · 04/03/2026
YES!
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Retro Theory @retrotheory.bsky.social · 03/03/2026
Sending Mac vibes for #MARCHintosh
Macintosh Quadra 700
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Retro Theory @retrotheory.bsky.social · 01/03/2026
Give github.com/retrotheory/... BigMaclock a try, It supports dynamic pixel sizing so you can run it on a larger screen. #MARCHintosh
Date and time on an AmberCRT Macintosh,  it gives a warm glow
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Retro Theory @retrotheory.bsky.social · 01/03/2026
Instead of turning a clock into a vintage Mac, I turned a vintage Mac into a clock!, I though it would be fun given its #MARCHintosh The program can be downloaded here: github.com/retrotheory/... It supports US/EU month day order AM/PM, Invert display, 'grey' background and alarm function
Vintage Macs running an application that bears a strong likeness to a tiny Macintosh clock
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Retro Theory @retrotheory.bsky.social · 11/02/2026
At 40 years old, this Macintosh Plus is officially living its best life: no social media, no notifications, and zero concept of "The Cloud"—just a physical box of floppies and dreams
A vintage Macintosh Plus and a Macintosh SE/30 computer sit side-by-side on a desk, powered on and glowing under vibrant pink and blue "vaporwave" neon lighting. The Macintosh Plus is in the foreground, displaying the "About This Macintosh" system window on its monochrome screen, with a classic mechanical keyboard and mouse positioned in front. The background is a soft, out-of-focus wash of neon colors against a plain wall.
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Retro Theory @retrotheory.bsky.social · 06/05/2025
Wow!
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BGOllie @bgollie.bsky.social · 15/01/2025
my most epic monitor repair to date. Snapped in 5 places, 105 traces repaired... youtu.be/Dsje26clJ-Q #amiga #commodore #crt #RetroComputing
youtu.be
Broken Commodore 1085s epic repair
YouTube video by The 8-Bit Manshed
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Retro Theory @retrotheory.bsky.social · 07/01/2025
Picked up an old soldering station from a junk yard in Mos Eisley, seems to be stuck in Aurebesh mode.
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Retro Theory @retrotheory.bsky.social · 22/12/2024
#SonicScanlineSunday
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Ripley the Tech Otter @ripleytech.bsky.social · 18/12/2024
How tall can you make a 5150? #retrocomputing
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Sean Hodgins @idlehandsdev.bsky.social · 16/12/2024
No love from @hackaday-feed.bsky.social on my latest project. Maybe repost to let them know I’m not dead.
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Retro Theory @retrotheory.bsky.social · 13/12/2024
Late 1960s early 1970s analog electronics was so colourful.
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Retro Theory @retrotheory.bsky.social · 10/12/2024
IBM vibes
IBM PS1 2011, 80286  2.5MB RAM
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Retro Theory @retrotheory.bsky.social · 09/12/2024
Mac Vibes
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BlueSCSI Ultra @bluescsi.com · 09/12/2024
Stability, framework updates, and Pico2/2W support in the latest release, check it out! github.com/BlueSCSI/Blu... #BlueSCSI #SCSI #VintageMac #RetroComputing
github.com
Release v2024.12.08 · BlueSCSI/BlueSCSI-v2
This update is recommended for all users and should be the end of any odd SDIO timeouts or errors that were experienced by a small number of users. With the SDIO rewrite by @androda last release an...
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Retro Theory @retrotheory.bsky.social · 08/12/2024
Is the fastest 68k Macintosh an Amiga? I'm just asking. 😉
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Retro Theory @retrotheory.bsky.social · 05/12/2024
Kevin Noki is at it again, amazing work. www.youtube.com/watch?v=Grd_...
youtube.com
I Built Apple’s 1980s iPad Concept!
YouTube video by Kevin Noki
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Retro Theory @retrotheory.bsky.social · 03/12/2024
@ronscompvids.bsky.social , I guess this connector is video out, but cannot say I ever saw it done this way before
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Jeff Geerling @jeffgeerling.com · 02/12/2024
Sometimes I don't understand why YouTube's algorithm doesn't recommend a video more widely. @idlehandsdev.bsky.social made a banger this month, it should have a lot more views: www.youtube.com/watch?v=dZ4I...
youtube.com
Become Anyone 2.0
YouTube video by SeanHodgins
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Retro Theory @retrotheory.bsky.social · 30/11/2024
Apple's A/UX on a Quadra 700, console access over serial with the VT220 terminal.
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This Does Not Compute @thisdoesnotcompute.bsky.social · 29/11/2024
Sony made the MiniDisc audio format, and they also made laptops…so what happened when they put the two together? Let’s find out! youtu.be/edKZVCiMpBk
youtu.be
That time Sony made a MiniDisc laptop
YouTube video by This Does Not Compute
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Retro Theory @retrotheory.bsky.social · 27/11/2024
Raspberry Pi booting on the IBM 5151 monitor. This uses a phosphor that has high persistence, good for reducing monitor flicker, bad for motion. #retrocomputing
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Retro Theory @retrotheory.bsky.social · 27/11/2024
If life gives you lemonade, make lemons , that's the saying right? Some time back, I bought an IBM 5153 monitor, and it arrived smashed.
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Retro Theory @retrotheory.bsky.social · 26/11/2024
Sometimes I think amber monitors were just a dream #retrocomputing
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Retro Theory @retrotheory.bsky.social · 25/11/2024
When going Amiga go full Amiga !
Amiga 500 with triple external floppy drives , with the 1081 monitor
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Retro Theory @retrotheory.bsky.social · 25/11/2024
Deleted my twitter account a few weeks ago. Now on bluesky and seems like anything is possible again.
Classic Mac system running  on a old IBM  XT monochrome monitor. This should not be possible.
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Retro Theory @retrotheory.bsky.social · 29/10/2024
In internet space no one can hear you eep
Macintosh SE30 being chased by a giant battery , known for killing vintage Macs.
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Retro Theory @retrotheory.bsky.social · 24/01/2024
Happy 40th Anniversary Apple #Macintosh
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