Re: [TUHS] core

On Sat, Jun 16, 2018 at 2:36 AM, Dave Horsfall <dave(a)horsfall.org> wrote: ​I sent Dave's comment to the chief designer of the Model 50 (my friend Russ Robelen). His reply is cut/pasted below. For context he refers to a ver rare book called: ‘IBM’s 360 and Early 370 Systems’ by Pugh, Johnson & J.H.Palmer . A book and other other IBMers like Russ is considered the biblical text on 360: As to Dave’s comment: I'll bet that my iPhone has more power than our System-360/50, but it has nowhere near the sheer I/O throughput of a mainframe. The ratio of bits of I/O to CPU MIPS was very high back in those days, Particularly for the Model 50 which was considered a ‘Commercial machine’ vs a ‘Scientific machine’. The machine was doing payroll and inventory management, high on I/O low on compute. Much different today even for an iPhone. The latest iPhone runs on a ARMv8 derivative of Apple's "Swift" *dual core *architecture called "Cyclone" and it runs at 1.3 GHz. The Mod 50 ran at 2 MHz. The ARMv8 is a 64 bit machine. The Mod 50 was a 32 bit machine. The mod 50 had no cache (memory ran at .5 Mhz). Depending on what instruction mix you want to use I would put the iPhone at conservatively 1,500 times the Mod 50. I might add, a typical Mod 50 system with I/O sold for $1M. On the question of memory cost - this is from the bible on 360 mentioned earlier. *For example, the Model 50 main memory with a read-write cycle of 2 microseconds cost .8 cents per bit*. *Page 194 Chapter 4 ‘IBM’s 360 and Early 370 Systems”* ​ ᐧ