PC-Engine (PCE) target support for cc65. this is still work in progress and
a couple of things need to be fixed:
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joystick support should get verified on real hw
 - the masks for buttons may be wrong.
 - 6 button gamepads are different and need slightly different code

interruptor support in crt0 (and cfg) is missing
- clock() should be hooked to a VBL interrupt

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a good emulator to use for PC-Engine is "mednafen" (mednafen.sourceforge.net)

run the compiled binary like this:

> mednafen -force_module pce <yourprogram.pce>

joypad keys are mapped like this:

w/s/a/d         up/down/left/right
numpad 2        (?) button
numpad 3        (?) button
enter           (start) button

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some useful resources on PCE coding:

http://blog.blockos.org/?tag=pc-engine
http://pcedev.blockos.org/viewforum.php?f=5
http://www.romhacking.net/?page=documents&category=&platform=4&game=&author=&perpage=20&level=&title=&desc=&docsearch=Go
http://archaicpixels.com/Main_Page

http://www.magicengine.com/mkit/doc.html

https://github.com/uli/huc
http://www.zeograd.com/parse.php?src=hucf