Post #1309841

2026-04-17 21:12 UTC

Part one of my crazy project finally done! Pico 2 generating a video signal mimicking a Mac Plus, good enough to fool the RGBtoHDMI. Now I can start working on the second Pico that will sample this signal and spit it out through the HDMI port without risking damaging the Mac logic board due to some accident. I learned a lot about programming the Pico (including PIO and controlling the system clock) and how exactly the Mac generates the video signal. #RetroApple

Replies (4)

@arroz@mastodon.social 2026-04-17 21:16

The horizontal offset is two pixels of what it should to display properly but meh it works! Those are things that can be easily adjusted if needed. EDIT: Also missing the first two lines of the image or so. This took longer than it should but it’s hard to be dealing with such low level stuff in a language in a bit rusty at while learning a new platform, all after long work days. Try to calculate frequencies and offsets while almost falling asleep! #RetroApple

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@MuseumJoe@oldbytes.space 2026-04-18 02:10

@arroz I am very interested in this. Is there a place we can follow updates and details on this project?

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@axel@hsnl.social 2026-04-18 05:52

@arroz Wow, amazing work Miguel! So your plan is to be able to hook a MacPlus up to a modern HDMI monitor? 😍

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@onegeekarmy@mastodon.social 2026-04-18 07:01

@arroz Brilliant work! This could be very useful.

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