Subject:
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Re: free memory
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 26 Aug 1997 05:11:14 GMT
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Original-From:
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Richard G. Kellner <kellner@acsys.com{Spamless}>
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Viewed:
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1299 times
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> Date: Mon, 25 Aug 97 23:41:45 -0400
> From: "Fred G. Martin" <fredm@media.mit.edu>
>
> I don't remember exactly, but the memory map for IC is something like:
>
> pcode itself: 8K used
> user compiled code + global program data: 16K available
> user process stacks and runtime locals: 8K available
> ----------------------------------------------------------------
> 32K total memory
>
> this is ball park. maybe randy/newton labs can provide more info on
> the latest ic versions.
>
> -fred
>
> > Ther is a way to tell how much free RAM I have on the HB with IC? or
> > how much memory does pcode take?
> >
> > regards
> >
> > stefano nardone
>
>
Hi,
I've just been working on the p-code interpreter. I've been working
with the Version 2.861, not the HandyBoard version. But I did a "diff"
and there doesn't seem to be much difference. At any rate, here's the
map I made for Version 2.861:
68HC11A1 Memory Usage
$0000 ZERO PAGE VARS
$1000-103F 64 REG BLOCK
$8000+ PCODE_ORIGIN
$B600-B7FF 512 EEPROM
$BFC0- GLOBALS_ORIGIN
$BFC0+ SPCL MODE I.V.
$C000+ JUMPTABLE
$C100+ STRING_TEMP_BUFFER
$C110+ PRINT_BUFFER
$C200+ UI_PROCESS_BUFFER
$C300+ PROCESS_TABLE
$C500+ MAIN_CODE
$E400+ PCODE_STACK_END
$FE00- PCODE_STACK_BEGIN
$FEFF- MACHINE_STACK
$FF00 VERSION_NUMBER
$FF02 THE_ZERO_ARRAY
$FFC0+ NORM MODE I.V.
Hope this helps. Better check any specifics you need (source code is
on the Web site), because I just made this a few days ago and there may
be errors. I don't remember a host command to list usages of all the
various memory blocks, but that would indeed be useful.
Rich Kellner
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