Hi, I have no idea about the interface of 3.3V and 5V, sorry, no experiences.
The next step would be to add a 5V-regulator just to feed the driver. In that case, how/do I need to protect the outputs of the microcontroller? I have looked into the 'standard' schematics for TTL and it seems to me that a TTL input with a 5V supply would tend to pull its input high, possibly destroying a 3.3V output. Is series resistors sufficient or are transistors needed too?
If you plan on going through so much trouble, just replace the K155ID1 with ten transistors, they will work on 3.3V as well. The MPSA42 is available in SMD as well, this way you will not lose too much space. The K155ID1 is not that great a chip that it is absolutely necessary to tweak every circuit into compatibility with that oldtimer, if you ask me ;-)
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