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Why not store emulated RAM on disk and get the full 512KB experience? Killing the drive from overuse? Surely the flash speed of the RP2040 surpasses the RAM speed of the original Mac.

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If only the RP2040 supported SPI PSRAM!

what about a esp32-s3?

The PicoGUS uses PIO to implement a PSRAM interface in order to store 1 MB of audio sample data: https://github.com/polpo/rp2040-psram

That is cool, I'll give it a go. It could be made workable for something like a JIT or interpreter (like the MicroMac). Could it be added to the RP2040 address space and used as a native load store target?

The neat thing about the ESP32 chips is you can extend their internal memory with external SPI PSRAM chips.

https://cdn-shop.adafruit.com/product-files/4677/4677_esp-ps...

Using QSPI RAM with RP2040's SSI in read-write mode http://dmitry.gr/?r=06.%20Thoughts&proj=10.%20RomRam

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