Re: mainframe vs mini, old and slow base and bounds, Why I've Dropped In

MitchAlsup1 <mitchalsup@aol.com> schrieb:

On Tue, 24 Jun 2025 0:25:47 +0000, quadibloc wrote:
>

On Mon, 23 Jun 2025 23:16:13 +0000, John Levine wrote:
>

In that era IBM made their own chips, so there's no way they'd have used
an Intel microprocessor.

>
Oh, yes, I realize that. And an 8008 wouldn't have corresponded to
what had been claimed to have been used in the System/360 model 115:
a microprocessor that could either execute microcode to implement the
System/370 instruction set, or microcode to function as a channel.

>
For the record, as a fun side-project, I wrote 8085 asm to interpret
the 360 ISA.

The 360 ISA with its single-byte opcode is a good target for
emulation on a byte-oriented CPU, for sure.

Your emulator might actually have been faster than the 360/30,
I believe.