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I'm trying to remember--the smallest DOS/360 memory footprint was what, 8K? 16K? Whatever, it wasn't much to support 1 background and 2 foreground partitions. Lots and lots of supervisior transient "phases" of course, read in from disk, but still it was impressive what could be done in a small amount of memory. Almost makes CP/M seem bloated by comparison. I recall that when Neil Lincoln was working on a proposal for a supercomputer for NASA Ames (IIRC he called it his Super-X-by-God) back in the 1970's, , he solemnly informed me that the OS would be segregated in its own dedicated memory--all 16K of it. Now, that was 16K 64-bit words and I assume that most of the job control and slower I/O tasks would be handled by other machines, but to me it represented a line drawn in the sand. I've always thought it a pity that other manufacturers didn't follow his lead and legislate in hardware the size of the OS kernel. Cheers, Chuck