Dear Jecksons,

Is it possible temporary to use x2 32kB SRAM as 64kB SRAM not? because temporary i can't get this IC from my local.

Now my progress is i able to run my external code on sram but have to set EA pin to GND. I would like to set EA permenent in Vcc and run the application code after bootloader.

This concept is similar to PAULMON2 but now i'm expand the memory to 64kB.

My actual problem is I'm facing interrupt (eg. Serial interrupt and Interrupt service routine) problem. I try to print a "Hello" message using serial. If i using standard library <stdio.h>
printf("Hello");
to print the message it is no problem at all. If i try to use Serial-Interrupt method then it will no work already.

How can i solve the problem?
Please advice..

Thank you,
Tang