On 11/18/2018 5:27 AM, Peter Relson wrote:
PC-SS was introduced prior to MVS/XA (pre-1980) Data spaces were introduced with MVS/ESA (1987-ish), stacking PC's at the same time.
We never used PC-ss prior to ESA/390 primarily because of a hardware restriction that forced the code to always be in common storage (e.g. LPA). ISTR it was undefined as to which address space your instructions were fetched from when in cross-memory mode. You guys did the right thing in ESA/390 by always fetching from the primary address space. In addition, that old PCLINK STACK/UNSTACK stuff was horrible! ijs...
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