I've done a fairly extensive search over the course of a few hours and still cannot determine if the SEC KS0066 is compatible with the HD44780. Some say yes, some say no, some say with software mods, and some say it works perfectly with PBP's LCDOUT command.
I only found one official datasheet which was pretty poor, that shows a connection between the two drivers, but does not mention if they are compatible. I have a 16x2 KS0066 lcd here made by Tianama that does not appear to work. The top line displays all black boxes and the bottom is empty.
The code is the simple and obvious PBP example.........

define osc 10
ADCON1 = 7
TRISA = %00000000
TRISB = %00000000
PORTA = 0
PORTB = 0
Pause 1000
loop: Lcdout $fe, 1
Lcdout "Hello"
Pause 1000

Lcdout $fe, 1
Lcdout "World"
Pause 1000

Goto loop


So, if any of you are using a KS0066 driven device, please post here. Tell us which display you are using and if there were any workarounds, if it works perfectly out of the box.
This should help everyone who's looking for compatability information.

Thanks.