Hi,
I'm using a 32K ram at addr 0 to 0x7FFF as an HD buffer for the MP3 file. I want to read a new sector to this buffer when at least 512 bytes have already been played, I tried to sub 512 from the playing pointer (dptr) to check with the update pointer, but when the pointers roll over from 0x7FFF to 0 it doesnt work right. any ideas?

Thanks, Gabriel