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Brad Stone wrote:
But isn't single level storage more of an OS thing than a
hardware thing? I mean, there are still memory, drives,
etc. It's not like the drives in the AS/400 are different
than others... you can install an AS/400 SCSI drive in any
machine you want pretty much.
Partly right. But consider that OS/400 (and back to CPF) uses 16
byte pointers, which the system knows are pointers by a hardware tag
bit.
You also need to take security into account. In a conventional CPU
architecture, processes run in their own address spaces, which means
one process can't access the storage of another. In a single level
store system, all processes run in the same (one honkin' big)
address space. Basically, your CPU needs to understand which process
is authorized to specific portions of that address space.
Sure, the disk drives are the same. But how information is laid out
on the drives is different. In a single level store system, the
drive is essentially one honkin' big swap partition. You can't just
take a drive from one system and install it in another since the
addresses assigned to the objects won't line up. (That's why you
need to do save/restore on the objects.)
Sure, it wouldn't be easy, but if IBM really wants to sell
software (like it seems they want to) then I would think it
would be something worth looking into.
Last I knew, IBM was more interested in selling services! ;-)
Would a port of OS/400 generate more profit for IBM? I have no idea.
But wouldn't you really rather have a true low-cost iSeries machine
than a Mac running OS/400?
Cheers! Hans
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