ya i am using a pre assembled branded and tested board from paulmon

on writing to the ram(2000h-7fffh) i got the following errors

^.................
download completed
12 lines recieved
200 bytes recieved
200 bytes unable to write

loc:2000>
also when i try to write into flash memory (8000h-7fffh) with
z command(flash erase).

it gives following error message

unexpected error

also i wanted to know that what does c(clear memory) command does in paulmon2
menu
what memory is it going to delete?
any solutions?