Thanks for the quick response... ;^)

OK, this makes sense....

When I use the MPASM assembler, how do I declare/allocate RAM storage ???

If I want to use three single byte variables, is this the right way to do it ?

         ORG  0000
  Temp1  DB         ; first storage location
  Temp2  DB         ; second storage location
  Temp3  DB         ; third storage location

Bob Segrest

At 01:58 PM 2/9/97 +1000, you wrote:
>Thus spake Bob Segrest (bobslan@EROLS.COM):
>
>> How do you differentiate between the location of a variable (temporary
>> read/write storage) program memory (executable code) ???
>
>RAM and ROM are in separate address spaces - on the 12 and 14 bit PICs
>there is no way to read code address space. In the memory map the
>address for code and data overlap - they both start from zero. the
>16 bit PICs (17Cxx) have instructions to read from program memory,
>but you can only do so with these special instructions. This is a
>typical Harvard architecture, same as the 8051, as opposed to a Von
>Neumann architecture, where code and data are in the same address space,
>like a Z80 or 68xx.
>
>--
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>clyde@htsoft.com      | P.O. Box 103, Alderley, | Fax:   +61 7 3354 2422
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