On 2014-05-20 17:01, Cory Smelosky wrote: On Tue, 20 May 2014, Johnny Billquist wrote: M+ do not need split I/D-space. But you do need 512K of memory. But the 11/23 and 11/24 are supported CPUs. I have 1M of memory. Sure you're not confusing the 11/23 with the 11/23+? I was poking at 4.6M+'s SYSGEN and it wouldn't accept 11/23 as an answer. The difference between the 11/23 and 11/23+ is the amount of memory. The original 11/23 could not go above 256K... If you have more, then you actually have an 11/23+. (That said, without split I/D-space, you'll have preciously little pool space, but that might not be a big issue for you right here.) Probably not. I'll only have one disk in use at a time really. Pool space is used for many things, but with just one user, and few things running, not much pool is needed. Johnny