HI,

P87C51 => 4 K program memory, 128 bytes ram

Program memory => 3607 bytes
Ram memory => up to 7E
Ram types : bdata, idata and static char.
I am using overlay and small model.

I realize that the program run and stop, because I can use the UART and receive 1 character. I tried to chance the reset time, but I failed.

Questions :
1) I think I didn't use extra memory.
But is there any chance of using more than 127 bytes without I know ?
I have analyze the main.m51 and I didn't realize any extra memory use.

2) The stack is on 7E, can I have problens with it ?

Annibal