>> The storage bus has been at least 16 bits wide as long as anyone can >> remenber.
> I remember the 360/30 (used one in high school), and I'm pretty sure > it had an 8-bit bus. But I could be wrong. The 360/30 has an 8 bit bus and 8 bit ALU. The 360/40 has a 16 bit bus, but still 8 bit ALU. Memory writes can be eight or 16 bits. The 360/20 has 8 bit memory, but can write four bit units. Makes decimal instructions easier. The ALU is four bits wide, but can only add or subtract one. I had one running at the Living Computer Museum a few years ago, but it isn’t running now. The museum is working on getting a 360/30 running, but so far it isn’t. > So two processers both fetch the same 16-bit frame. One > updates the even half; the other into the odd half. Both store. > Last guy wins (sort of). With only one processor, you still have I/O to consider. And for the 360 and 370, the interval timer. Tradition was to read the old value and replace it with.a new value with one MVC.
