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

You may use an 78L33 regulator. It is pin-compatible to the original LM2940. When using any 78LXX regulator, make sure that two additional 100nF ceramic caps are attached to the input and output pins with the other ends connected to ground as close as possible to the regulator to avoid unwanted oscillation. Most 78XX datasheets show how you can increase the output voltage of the regulator by "lifting" the ground pin. Thus, you might install a 3.3V regulator with a "lift" to 5V. This allows you simply switch between 3.3 and 5V using a switch to short the "ground lift" for 3.3V operation. OK, I must admit, this requires a bit more "hacking" the board.

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