> -----Original Message-----
> From: IBM Mainframe Discussion List On Behalf Of John P Baker
> 
> If I understand the filing, I believe that the difference is 
> that both FLEX-ES and Hercules are in fact "instruction 
> simulators", whereas PSI was producing an "instruction emulator".

>From http://www.dictionary.com:

Emulate [emulator]:

3. Computers. a. to imitate (a particular computer system) by using a
software system, often including a microprogram or another computer that
enables it to do the same work, run the same programs, etc., as the
first.  
b. to replace (software) with hardware to perform the same task. 

Simulator:

2. a machine for simulating certain environmental and other conditions
for purposes of training or experimentation: a flight simulator. 

Not a whole lot of difference there....

    -jc-

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