Scratch Ram

Archiver

What is scratch ram and how is it different from the standard bs2 ram.

Thanks,

Jim Gorbet

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Archiver

A scratch pad RAM is just what the name implies. Like a pad of paper
that is a 'scratch pad' you write on it, erase or throw it away, the
paper, and rewrite. A RAM that is a 'scratch pad' that is temporally
used to store information. You can connect one of these to the stamp,
but with out Parallax's permission, you can't write extended variables
to them, unless what you read or write is less than $FFFF (hex for
65,535).. :-))



HTH,

Leroy

Jim Gorbet wrote:
>
> What is scratch ram and how is it different from the standard bs2 ram.
>
> Thanks,
>
> Jim Gorbet
>
>

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Archiver

The scratchpad RAM is available on the BS2e, BS2sx and BS2p and can be used
as a general purpose holding area or as a communications mechanism when
switching between program slots.

It differs from the standard RAM in that it cant be named or accessed
directly, and you can only deal with it a byte at a time. PUT is used to
place a byte of data at a specific scratchpad address. GET is used to
retrieve it.

Here's a couple of subroutines that use the scratchpad:

' save variables to scratchpad
Push_All_Vars:
FOR B25 = 0 TO 24
PUT B25, B0(B25)
NEXT
RETURN

' retrieve variables from scratchpad
Pop_All_Vars:
FOR B25 = 0 TO 24
GET B25, B0(B25)
NEXT
RETURN

I don't normally advocate the use of internal variable names, but here's an
exception. Both routines use a the last available byte in the variable RAM
as a loop counter to save all the others. These routines also take advantage
of the fact that the Stamp treats the variable RAM as an array.

-- Jon Williams
-- Parallax


In a message dated 5/6/02 4:53:08 PM Central Daylight Time,
jimgorbet@y... writes:


> What is scratch ram and how is it different from the standard bs2 ram.
>




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