Re: IBM 1130 (was Re: musical processing)

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#3480

From: hanc...
Date: Mon, 07 May 2018 20:51

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On Saturday, May 5, 2018 at 5:19:00 PM UTC-4, Charles Richmond wrote:
> On 5/5/2018 2:17 PM, Quadibloc wrote:
> > The prototype of the 5100 in the Smithsonian used an 1130 emulation; as this did not produce adequate results, production models used 360 emulation for APL instead. Both emulated the System/3 for BASIC.
> > 
> 
> I had access to APL\360 and the IBM 5100 in college.  There was at least 
> one instance... when the two got different answers when evaluating the 
> same expression.  How could that be... if the 5100 emulated APL\360???

Care must be taken when using the words "emulation" vs. 
"simulation".  In IBM parlance, "simulation" meant that a
software program simulated another machine.  In the prep for 
S/360, IBM found that simulators ran rather slowly.  In contrast,
"emulator" referred to hardware features, such as microcode, that
mimicked another machine.  IBM found that microcode emulation ran
fast and was suitable for S/360 to act as older machines, a major
selling point.

Has anyone used a S/360 emulating a 7090 series machine, especially
with floating point work?  How did that work out?

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