!EA is VCC, according to (page 6) of the data sheet, to enable the internal memory (which would be rom I guess).

According to my datasheet (page 21), the EXTRAM bit in AUXR is set by default, so I've added the following to my code:

unsigned char _sdcc_external_startup ()
{
AUXR = AUXR&0xfd; // disable external memory

return 0;
}

-Very elegant option by the way, to do things before main() is started -

Anyway, I really guess it has something to
do with RAM. using just a couple (about 4)
local variables in my main, and about 10 for my i2c isr, I do manage to run code, and get things output to my lcd display (using i2c). However, when I enter a:
char buf[32]; in the main, it gets screwed
up.

I've tried a lot of options, memory models,
xram-movc, no-reg-params, but I keep getting negative results.

The ugly part is, all this code DID work with a 80c552, using external ram! However, using the 89c668, I haven't got things working ok, but a friend, who uses Keil, DOES get it working, just by setting a couple of checkboxes to enable internal ram etc. :(

Eric