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memory map changed

Load "C:\\Keil\\C51\\Examples\\Chipcon\\RF\\halRFtest\\halRFtest_433"
*** error 65: access violation at I:0x80 : no 'write' permission

616: INT_SETFLAG(INUM_TIMER0,INT_CLR);
C:0x13BF C28D CLR TF0(0x88.5)

Memory Map
001: I:0x00 - I:0x7F read write
002: C:0x0000 - C:0xFFFF exec read
003: X:0x000000 - X:0x00FFFF read write

error caused by Timer0 ISR trying to clear the timer
overflow flag at TCON^5, when I try to reset Memory
to what the User's Guide calls for.

0x000000 - 0x00FFFF read/write this should be IDATA that overlaps the SFR's right?
0x010000 - 0x01FFFF read/write this is XDATA
0xFF0000 - 0xFFFFFF exec read this is CODE

I have try'ed to enter the default map for small memory model using DeBug > Memory Map but keep getting
error:invalid address range given.

what could have caused the change in the memory map
and how should i change it back, please help

Calvin

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