In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Without a scope, these problems are a bit dicey to locate.  A complete schematic makes it easier to spot what you left out.

The MAX232 document that I have indicates a mere 8ma is required, but that doesn't take into account the noise it generates from the voltage multiplier circuitry that makes the 12volt.  The regulator only regulates incoming power.

The rule of thumb is that every chip has 0.1uf between Vdd and Vss at the chip to isolate the noise it internally generates when switching or whatever.  A regulator will never catch that.

Since the MAX232 is on the regulated side, that rule applies.

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