On Tue, May 21, 2024 at 06:36 Ren¨¦ Ferland via <ferland.rene=[email protected]> wrote:
>> Just wondering if anyone else has seen this issue.
Yes, I have seen this issue, when using SDL Hercules. My solution to it is to uncomment the line
# ECPSVM ? ? ? ?DISABLE DISP1 DISP2
in the file vm370ce.conf. I don't remember where I learned this (lucky?) "work around".
I believe it is mentioned in the VM/370 Community Edition readme file, specifically citing the DISKMAP command.
I am not aware of possible side effects of it,
Turning off the DISP1 and DISP2 Extended CP Assist instructions makes the process of dispatching a virtual machine slower.? So just about everything in a VM system takes more time to run.? In my opinion, it's not a ?dramatic effect, and my laptop is still faster than and 370 I worked on.
The problem is well documented at ?
, but the summary is that these ECPS instructions damage the vm's floating point registers, that the VM/370CE Rexx implementation uses FPRs heavily, and that DISKMAP is a Rexx program.
