At 18:22 +1100 on 02/19/2007, Ken Brick wrote about Re: IBM S/360
series operating systems history:
DOS/VS R27 1972-73 timeframe - check when the small 370'e (135 & 145)
become available
That was DOS/370 R27. It was NOT a VS system (that was R28 I think).
This ran on 370 135/145 BEFORE the release of the VS Microcode.
Basically it was DOS/360 with the new 370 instructions and the 370
CPU Support.
Note: If R27 was DOS/VS than it was DOS R26 which was DOS/370 and the
last real memory operating system. Which ever release was DOS/370, it
was a single release between the last DOS/360 and the first DOS/VS.
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