5 ms·
Well, if it were only to run software written in the 80s, an emulator would do (modern hardware compensating the inefficient execution many times over).
by guenthert 3y ago
Well, if it were only to run software written in the 80s, an emulator would do (modern hardware compensating the inefficient execution many times over).
- vb-8448 3y agoI'm not sure, but I guess under the hood IBM does some emulation to guarantee backward compatibility.
- thequux 3y agoLargely no, actually; modern z/Architecture is a strict superset of the System/360 ISA from the 70's. Every instruction that accesses memory has the original 24-bit address version, a 32-bit version, and a 64-bit version that also uses 64-bit registers. Thus there's no emulation involved; at least, not that's visible to the OS (but who knows what the microcode is doing underneath)
- Pet_Ant 3y ago> modern hardware compensating the inefficient execution many times over That's assuming volumes haven't changed. They had credit cards in 1980 but the volumes have gone up considerably. I'd also guess trading volumes and other financial products as well.