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advice on a microcontroller board (and an interface)

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sknoogleplex

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Hi, I'm a student working on a project where I need to code everything in assembly and cannot use an OS or libraries. (I.e. I need to code _everything_.) The amount of code I write needs to be absolutely minimal. (Each unnecessary line should be avoided for the project to be successful.)

The summarized I/O requirements of my finished system are:
-I need to be able to do basic r/w to about 1MB of some type of external, non-volatile memory.
-I need two RS-232 connectors. (One for screen output, one to talk to a smart card reader. Should have corresponding UARTs, of course.)
-I need to be able to play basic sounds out of a speaker (i.e. some kind of analog output).

First, is there any interface anyone would recommend for the readable/writeable, external storage (since I need to manually communicate with it using a very small amount of code). Is SPI the best?

More importantly, can anyone recommend a microcontroller board that might suit this purpose.

Let me know if you'd like any more details or have questions.

Thank you very much. -Ryan
 
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