Hi
I am trying to erase/write to an external RAM (DS1230), in assembly. I am writing the character #0FFH (named BLANK in program) to the ram.
I set the DPTR to #0000H, read the address, if different from #0FFH, then I write a blank value, and loop back to check the address. If the address read (or written) is #0FFH, then I increased the DPTR (INC DPTR) till end of RAM.
The problem is :
extremely slow (we are talking minutes here !) and the odds addresses are set to #0FFH, but the even addresses are set to #0F7H (..?)
As anyone seen that problem ? I have checked the connections (but would not explained why it worked fine with odds addresses ).

Also I would like to connect an 8052 to a modem, can someone points me in the right direction (56K modem, not adsl), pin connections, diagrams...

Thanks
Clive