I do not have C code kor the KS0108 but I once wrote a simulator for that display in JavaScript. It's available at:
http://www.geocities.com/dincerayd...cdsim.html

I know a site that has C source for that LCD in AVRGCC. It should not be difficult to port that to a 8051 C compiler. URL is :
http://www.indata.si/grega/

If you need datasheets, software utilities and misc, info on that controller you may want to check the LCD related pages of my site at:
www.geocities.com/dinceraydin/lcd/

I hope this helps.

Regards,

Dincer Aydin