How to determine if device is 27x132? -- MIDRANGE-L

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I'm working on a program that switches the display from 24x80 to 27x132 
depending on the view option that the user selects.
Using the DSPSIZ parameter in the DDS for the screen and setting the 
appropriate indicator before doing a WRITE works just fine.

If the user is working from a 24x80 only terminal, I need to limit the view 
option that they can select; otherwise I get an error on the WRITE (in 132 
column mode).

Other than retrieving the device characteristics of the user's terminal 
device, is there an easy way of determining if the user's terminal is a 
27x132 device?
Are 24x80 terminals always device type 3179 and 27x132 terminals always 
3477 device type?

Thanks in advance!

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