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The STM32F429 Discovery board [1] has 2MB of Flash and 256KB of internal RAM. It also looks like it has 64 Mb of SDRAM which might be what your looking for. We have an engineer where I work who is trying to get mRuby up and running on one. It has tons of memory for a Cortex-M part/board

[1] - http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/PF259...

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That's definitely more like it. 256k is a reasonable chunk. Although at $20 and 144LQFP, it's a pricey and kind of chunky part. It exists though which is nice.

How does mRuby do GC; does it ref count? I don't think lisps could really afford to be ref counted, unless you pool the cons cells into groups that are ref counted. My implementation was a dual semispace collector which didn't help matters wrt space.

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