On 9/4/11 10:16 AM, Eric Smith wrote:
  I'm not sure how device support on the
29xx/39xx compares to Unisite, but the
 only old programmable devices I've found that the Unisite doesn't support are
 the first generation EPROMs (1702, 1702a,
 5203, 5204), due to these needed rather extreme programming voltages (e.g.,
 -40V to -50V) on many pins (not just one program pulse pin). The Unisite does
 support most bipolar PROMs, while most modern
 programmers do not.
  
 Just checked, and the earliest parts a 29xx/39xx will program is the 2716, ie.
 they don't support 2708's. 
If you are looking to program those with a data IO programmer, then the 29B
or model 19 are the most modern ones that support those IIRC.