IBM 360/30 in verilog

Curious Marc curiousmarc3 at
Mon Jul 11 19:35:29 CDT 2016

Thanks for the detailed answer. I see the front panels look remarkably similar though. Short of redoing a 360/50 on an FPGA (I'd need to retire to have enough time for this one!), could I use the /50 panel with the /65 emulator?

> On Jul 12, 2016, at 1:11 AM, Jon Elson <elson at> wrote:
>> On 07/11/2016 06:40 AM, Curious Marc wrote:
>> No kidding! That's a massive effort. How close is that to a 360/50? I have a front panel that needs a brain, could sure use that!
> 360/50 is a 32-bit machine, the real thing has a core memory "local store" and (3, IIRC) built-in channels.  it does not allow memory interleaving.
> The 360/65 has a 64-bit path to memory, and does permit interleaving.  it also allows two /65s to be put together in a multiprocessor system.  There are a few additional instructions to communicate between CPUs.  The 65 has solid state local store, and a 56-bit ALU, so it can do double-precision floating-point arithmetic without having to double up the cycles, as the /50 does.  The /65 has no built-in channels.
> Jon

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