[rescue] [OT] S: IBM /370 or /390 card

[Dave McGuire]

   And all those extra processors (in CUs) running all the channel 
programs to implement I/O.  Those are all emulated in the smaller 
PC-based development systems.

   In a P/390, for example, there's a daemon process running on the host 
system (be it OS/2 or AIX) that executes channel programs, emulating 
control units.

              -Dave

On 9/12/23 17:11, Mike Katz via rescue wrote:
> You answered your own question.  The I/O system (the Channel 
> Architecture) and I'm sure the big iron 370's where more powerful than 
> the re-microcoded 68000's.  Cycle speed, pipeline, cache, etc.
> 
> On 9/12/2023 4:03 PM, Lionel Peterson via rescue wrote:
>> That just doesn't sound right - if IBM could make a meaningful 370 
>> mainframe with the 68000 CPU, why would they continue using all those 
>> zillionsvof 'modules' to build up a mainframe? Tradition?
>>
>> The I/O system in a mainframe is where the value is, not the CPU (for 
>> common business applications, not scientific computations)...
>>
>> Ken
>>
>>> On Sep 12, 2023, at 15:25, Mike Katz via rescue <rescue at sunhelp.org> 
>>> wrote:
>>>
>>> Supposedly one of the reasons that the original PC used an Intel 
>>> 4.77mHz 8-bit bus 8088 was that the 8MHz 16-bit bus 68000 was more 
>>> powerful than an entry level 360.  I don't know about a 68008 (8-bit 
>>> bus version of the 68000).
>> _______________________________________________
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> 
> 
> _______________________________________________
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-- 
Dave McGuire, AK4HZ
New Kensington, PA