Then you have a problem with your programmer.
Vpp could be measured during programming. During normal reading operation, there is no Vpp. Don't know which version of programmer you have (I have 3b). If it's one of these variants, 3.., the 100uH choke in 34063A should be wound on toroid core, not the resistor like one, due to the higher current demands of 2532 chips on Vpp line.
Anyway you should be able to use 2732 instead of 2532.
If you have low Vpp, check the 34063A and it's circuitry. Older chips as 2532 may need longer programming pulse, this is easy to set, see attached images.
it's easy to go to the following URL: **broken link removed**
and to check
Beware that you may need to supply the external power for those old EPROMs, they are power hungry
USB hub can supply up to 500 mA to a device after enumeration (up to 100 mA before), but that solely depends on your PC USB hardware (you can even fry your USB port if you try to draw too much current).
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