Den 01/01/11 20.29, Maurice O'Prey skrev:
On 1/1/2011 11:26 (or thereabouts) AM, Joe wrote:

I'm not even sure where to take this particular question, Maurice. A
single-user MS-DOS machine compared to an IBM i? How do these even
compare? One runs an enterprise, the other runs (maybe) a store front.
How do you compare these?
For starters they have a CPU, memory and a hard disk (a bit like a computer
I suppose), and then they obviously have an operating system, that is how I
would compare them.
Comparing OS/400 with MS-DOS is perhaps a bit unfair to both, due to the vast differences in the underlying hardware as seen by the application programs (and perhaps even operating system too).

MS-DOS is designed to run on a 8088 which essentially is 8-bit processor with a 16-bit instruction set and a 64 kb segment view of the system memory. The 8088 did not have any hardware for memory protection so all programs could manipulate every memory location freely including those of other programs and the operating system itself.

Hopefully the AS/400 hardware was different from that :)


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