My Dataman programmer tells me the following:
"The programmer applies a high voltage to the appropriate pins on the socket. Don't insert device into the socket that isn't an EPROM or FLASH, it may be damaged. This service is applicable only for devices in DIL package or any other non-DIL package using 1:1 wired package convertor. The control program only support this time EPROM's and FLASH with 28 and 32 pins.
We don't recommend to apply this function to 2764, 27128 EPROM. Most of them haven't ID.