T51prog is an Elnec MCS51 microcontroller programmer.
Discontinuation and support
Elnec’s discontinued-products archive lists discontinuation in 08/2006. The archive lists 07/2016 in its software-support date field; check Elnec for current status. Its listed replacement or solution is BeeProg4C. Replacement does not guarantee identical device coverage.
Check the exact device, package, programming operation, adapter, software version and computer interface in the manufacturer's documentation before use.
Sources: Elnec discontinued products and support; Elnec software and manuals.