> I was not aware that the System/360 had 16 bit addressing, I thought it was always >24 bit.
The 360/20 was explicitly 16-bit, though many won't achnowledge it as a /360. The 360/30 used the 24-bit model but wrapped at its maximum 64KB - so you could move i+n bytes to the ast byte of storage and clobber the PSWs. > There have been some other 32 bit processors with 24 bit addressing as well (such as >the 68000). Having the address size different than the word size of the machine has usually resulted in problems. What often happens is that the latter versions of the processor use a larger address size like 32 bits in the 68000, and 31 bits in 370/XA. The 360/67 was a 32-bit machine. -- Phil Payne http://www.isham-research.com +44 7785 302 803 +49 173 6242039
