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Exact RS232 baud rates versions of existing boards (one or two maybe): 3.6864, 7.3728, 11.0592, 14.7456MHz… 
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Low voltage versions of existing boards: ATmega128L on AVR-MT-128… 
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ATmega32(L) on AVR-M16 = AVR-M32 
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this is reasonable request, usually user require maximum computing power i.e. 8Mhz, 16Mhz 
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What is the reason to put L mega when it uses 5V power supply? Don’t get the idea. LCD must be driven with 5V either so 3.3 V version is not quite resonable 
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already done, we have production run of AVR-M32B same as AVR-M16B 
Tsvetan