Hi Olin

I have two comments about your schematic.

My PICSTART PLUS has two things you so far have omitted: LEDs: one for
POWER, one for ACTIVE. Most of the time, these are not needed. But then at
some point, when things are going wrong, they immediately tell you "turn on
the power, dummy" or "the powers on, look elsewhere for your problem". Plus
the ACTIVE led tells you when it's completely safe to plug/unplug a target
device.  Come to think of it, an led that sits on the dataline from the PC
also tells you that your PC is working insofar as getting data to the
programmer.  This sort of thing helps the debug process when things aren't
going right.

The other comment is just wondering whether pulldowns are needed on the
'628 output to keep the 13 volt drivers off during power up.  Devices
'shouldn't' be inserted before power of course, but sometimes the power
gets cycled (ac line brownouts, etc.) so maybe this is a useful idea. Maybe
not.

Tom M.

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