Can I use system memory area (start address at 0C000h) to store some programs data (graph buffers for example) ? If not, what is stored in this area ? What is its end address ? There are floating point stack and operator stack on the RAM page 1. Where are stack pointers of them. If I'm not using floating point calculations in asm program, can I use all this RAM page to store my data ? Robert Niedziela.