This group is for all folks running the original IBM VM/370 Release 6 operating system (or later (e.g. VMTCE (Community Edition)) on Hercules. Like the other early IBM operating systems this version has always been in the public domain and so can be freely distributed. The base version as supplied by IBM is lacking in many facilities. IBM solved this by providing additional extension products which were licensed and so are not available. There are however many user enhancements available which can be installed. In addition, in order to get users up and running quickly updated "releases" of VM/370 included the most popular updates are available for download, so novices can start to learn VM without having to delve into the system internals. It is intended that this wiki will provide information on the base release and these updates.
The available versions are here :-
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Re: ECMODE on in every user directory entry
I was going to point that out. Isn't this where the (undocumented but everybody knows about it?) ability to put a X'15' byte in the command gets used? So you have a single command line with SET ECMODE
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Tony Harminc
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#4192
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Re: ECMODE on in every user directory entry
Hi, JUst for grins, I checked out both Bob Adele's 3 pack system that's on my system and the VM/370 R6 Sysgen manual.? They both show only 3 users with the ECMODE on the OPTION card in the User
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gdblodgett
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#4191
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Re: ECMODE on in every user directory entry
In most cases, there is no reason to specify ECMODE in each and every user directory entry.? IBM's own VM/370 documentation states this in so many words and also recommends against it for performance
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Bob Polmanter
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#4190
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Re: ECMODE on in every user directory entry
Joe, Because that is what the manual says it does. Dave Sent: 30 April 2022 22:35 To: [email protected] Subject: Re: [h390-vm] ECMODE on in every user directory entry "Also note that what ECMODE ON
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Dave Wade
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#4189
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Re: ECMODE on in every user directory entry
Joe, Its a CP command. CP commands work with nothing IPL d in the VM. In fact if CMS is IPLd and you do ¡°SET MODE VM¡± you then need to re-ipl CMS because it resets the machine, as do some other CP
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Dave Wade
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#4188
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Re: ECMODE on in every user directory entry
"Also note that what ECMODE ON does is to change the hardware being emulated by CP." how so? joe
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Joe Monk
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#4187
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Re: ECMODE on in every user directory entry
In that particular case, you would have OPTION ECMODE in the directory entry for the userid that IPLs MVS. Dave's answer was what I needed. Sorry I wasn't clear. ... Mark S.
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Mark A. Stevens
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#4186
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Re: ECMODE on in every user directory entry
How would you issue CP SET ECMODE ON if MVS is the IPL'ed OS? CMS is never IPL'ed in the VM. Joe [email protected]> wrote:
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Joe Monk
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#4185
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Re: ECMODE on in every user directory entry
Mark, Historically the answer is ¡°it depends¡±. The tendency was to leave ECMODE off because it can have a performance impact, so on a big system where you had lots of users, you left it off where
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Dave Wade
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#4184
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Re: ECMODE on in every user directory entry
Yes, Joe. But you missed the point. If you need ECMODE on, would it be best to have it set in USER DIRECT?? OR Is setting ECMODE ON (CP SET ECMODE ON), after logon, good enough?? Thanks! ... Mark S.
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Mark A. Stevens
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#4183
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Re: ECMODE on in every user directory entry
USER DIRECT is the user directory. You must have a user directory entry to have a VM. So, even VMs that run disconnected (like a VM running MVS or RSCS) have a user directory entry. Joe
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Joe Monk
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#4182
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Re: ECMODE on in every user directory entry
So I am confused ... Surprise! It would seem "most" userids don't have the OPTION record, much less the ECMODE parm, but when it is specified, ECMODE is set ON at logon. Hence, if you need ECMODE on,
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Mark A. Stevens
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#4181
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Re: ECMODE on in every user directory entry
Joe, I didn¡¯t mention that because we were talking about ¡°normal¡± CMS users, and normal CMS users don¡¯t use DAT., but yes for many Operating Systems you need ECMODE. You, or ¡°a n other¡±
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Dave Wade
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#4180
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Re: ECMODE on in every user directory entry
True, but, CMS normally runs in BC mode.? Just saying ...
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Mark Waterbury
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#4179
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Re: ECMODE on in every user directory entry
CP SET ECMODE ON Joe
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Joe Monk
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#4178
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Re: ECMODE on in every user directory entry
ECMODE is also required to use DAT. Joe wrote:
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Joe Monk
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#4177
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Re: ECMODE on in every user directory entry
Harold, Its my experience that other things in VM required EC Mode because they also need like ¡°SET TIMER REAL¡± which needs ECMODE and changing modes needs an IPL¡. So for example many of the
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Dave Wade
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#4176
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Re: ECMODE on in every user directory entry
I agree with the use of the I/O masks on S/360. However in BC-mode on S/370, bit 6 is architecturally available for enabling interrupts from higher channel numbers. GA22-7000-0, page 8. VM could have
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Harold Grovesteen
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#4175
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Re: ECMODE on in every user directory entry
It's an architecture limitation. The original 360 architecture allocated one bit in the PSW for each channel's interrupt status, and that's the PSW you get in BCMODE. If you want more than 6 channels,
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Jay Maynard
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#4174
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Re: ECMODE on in every user directory entry
Can you describe why this is so? Is it a VM limitation or an architecture limitation? Harold Grovesteen
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Harold Grovesteen
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#4173
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