Interesting. I remember MVS/SE[1] and MVS/SE2 -- vaguely, before MVS/SP1.

I remember macros and fiche mentioning 3033MP and I thought it was 32MB support since each side had 16MB. And I think it was only the NUC that had that support built into it. The early bar as it were. ;-)

And then came MVS/SP2 (aka XA).

Steve Thompson



On 3/8/2023 2:13 PM, Mike Schwab wrote:
MVS/SP Version 1.3.8 (for MVS/370)
MVS/SP is for running 24 bit programs on 17-64MB real memory.
Copyrighted and not available currently.
MVS 3.8 is what is freely available, limited to 16MB real memory.

On Wed, Mar 8, 2023 at 12:59 PM Tom Marchant
<0000000a2a8c2020-dmarc-requ...@listserv.ua.edu> wrote:
Maybe she means what she said. MVS/SP Version 1.3.8 is referenced as a 
supported operating environment in this:
https://www.ibm.com/common/ssi/cgi-bin/ssialias?infotype=dd&subtype=sm&appname=ShopzSeries&htmlfid=897/ENUS5695-002

--
Tom Marchant

On Tue, 7 Mar 2023 16:03:13 -0500, David Spiegel <dspiegel...@hotmail.com> 
wrote:

Hi Terri,
Maybe you mean OS2/MVS 3.8(J)?
That could've been circa 1986.
(I also have a similar progression, but, did VS1 7D with BPE before MVS.)

Regards,
David

On 2023-03-07 15:25, Shaffer, Terri wrote:
It was 1984/1985, maybe 1986 even, as my memory is foggy..  yes mvs/sp 3.8 I 
added the 1.  Then XA/ESA/OS390/z-OS

Ms Terri E Shaffer
Senior Systems Engineer,
z/OS Support:
ACIWorldwide - Telecommuter
H(412-766-2697) C(412-519-2592)
terri.shaf...@aciworldwide.com
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