James,
Thank you for your reply.
I received the following message:
000002A8 0020 0000 0000 0003 80BF 8780 FD80 BF00
So ... It appears that I have 2MB in there :- )
Do you know what the other data means?
- Royce.
James MacPhail wrote:
> >My question is this: How can I VERIFY exactly how much RAM the Lisa
> >recognizes that it has - and what the operating system and the open
> >programs use of what is available?
>
> 1) You can use the Service Mode built-in to the ROMs to check the memory
> size, and do your own read/write tests to confirm it (although the
> self-test checks it pretty thoroughly).
>
> To enter Service Mode:
> - press the space bar during the self test
> - "Startup From" the floppy drive (with no floppy inserted)
> - When you get the "no floppy" error, type Apple-S
>
> The amount of memory is at location 2A8, so type this to see it:
>
> 12a8[return]
> 1[return]
>
> If you have 2MB installed, the first two words of the data will be 0020 0000
> (unlike intel chips, the 68K is big-endian, the high byte comes first)
>
> 2) I don't recall a 'free memory' type of display in the Lisa Office
> System. Recall that the LOS uses the MMU hardware to virtualize the
> physical memory, so "free" might be hard to define.
>
> Given the small amount of disk space, I expect this does not use a 1:1 swap
> file, but instead, memory pages are dumped starting with inactive read-only
> code (which can just be read again when needed), and then, when necessary,
> open documents are auto-saved by the tool that is editing them before
> dumping their pages. Of course the point is that the dumped pages become
> free and can be reused.
>
> In fact, the LOS seems quite memory-bound (lots of disk activity) even with
> the maximum RAM of 2MB, so I would expect that essentially all the memory
> is full, all the time. Presumably this contributes to the regal (some say
> glacial) speed.
>
> HTH,
>
> James
>
> James MacPhail "Think not of engineering as art,
> uo957_at_email.domain.hidden but of art as engineering"
> Sigma Seven Systems Ltd.
> james_at_email.domain.hidden <http://SigmaSevenSystems.com>
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Received on 2006-06-27 12:55:08