RUN a MAC 128 emulated on a TEMU RP2040-Zero board! How to modify the UF2 to use different GPIO pins

[@CraftRedux]

Comments for support! Keep up the good work Maf!

[@spidermaf]

Thank you Mr Redux

[@Waveshare_Ruan]

Thank you +1

[@willemstaal5337]

How cool that is! Is there also a version for the eps32 s3?

[@APZOEIRT]

Thank you

[@F4GMU]

Is there a way to download your .ef2 firmware ? I don't have a mac to compile my own. Thank you for your amazing works !

[@spidermaf]

github.com/SpiderMaf/SpiderMacPicoZero/

[@MichaelHarto]

I soldered a 10 pin ribbon cable to the 10 small gpio pins so i could use gpio 17 to 25. But somehow gpio 23, 24, and 25 don't work.

[@spidermaf]

Well if nothing else Spider Points awarded for precision work there. Well done for getting anything to connect to those tiny contacts.

[@KJW648]

A Atari ST on this .....

[@spidermaf]

Ooh. That would be sweet. Not sure of the rp2040 capabilities compared to an ST but I bet someone will do it

[@KJW648]

@@spidermaf I put Mac roms into an ST TOS sockets and it works.😘 So reversing this, could work ....... ?

[@alexcranmer8317]

Would love an ST on a pico. Unfortunately don’t think enough ram on an RP2040 for a 512k ST, not even enough for the very early 256k models. The new RP2350 has double the ram but still wouldn’t be enough for the full 512k. The RP2350b though can have psram chip to expand ram. The Pimoroni pico2 plus uses it with 4mb of psram so hopefully someone will be able to develop it using one.

[@spidermaf]

@alexcranmer8317 this is an amusing conversation as I was always an amiga lad and the great ST verses Amiga still burns strong probably.. but thinking about the chips in the amiga I doubt you could use the 2040 to emulate one completely, so I guess the ST would be similar. I had a device which took mac roms and allowed you to run apple stuff on the amiga, but doubt that's reversible. It just a case if the memory allows to get the emulator running on a Pico chip. Easy for me to say but need minds greater than mine to work it out. Anyone reading think it may be possible?

[@alexcranmer8317]

@@spidermaf Thanks for this guide, had been looking at building a picomac but never made my own builds before so will give it a try now. I was an ST guy so know a lot about that machine. Think it would be easier to emulate an ST than an Amiga as a more basic hardware used compared to the custom chips in the Amiga. Looking at the github for the picomac I think the maximum memory you can have on an RP2040 is 208k from the available 246k so would definitely limit an ST or Amiga build.