UNIX V7

On Jun 11, 2009, at 10:00 AM, Liam Proven wrote: It depends upon which variation of AIX you're talking about. I've dealt with AIX/370, AIX PS/2, AIX RT, AIX V3.x and later. With the exception of AIX/370 & AIX PS/2, they all used completely different code bases. What I was referring to (because that's what most people consider these days) is AIX V3.x and later. Those versions only ran (runs) on RS/6000 and later Power machines. The code base for AIX V3.x and later started out as some derivative of the AT&T code but the base kernel never was (except possibly some of the subsystems). The control program itself was completely alien to the AT&T code base. The entire structure was based upon (at the time) the Power's nearly unlimited virtual address space (52 bits). The 64- bit version has an 80 bit virtual address space. So the way the kernel was organized was to assume that address space was free. Need an array, allocate the address space for it statically and let the VM fault in physical memory as it's needed (which is also alien to most Unix implementations). The AIX control program was mainly written by 2 folks from Watson Research. TTFN - Guy