Needham's Electronics

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Formerly Dataman?

Notable for letting set programming voltage

https://www.docentelectronics.com/httpdocs/Needham/needham_electronics.htm

EMP-20

seems pretty popular, but parallel interface

http://ps-2.kev009.com/ohlandl/Needham_EMP20/EMP-20_Programmer.html

EMP-21

USB

EMP-20 vs EMP-21 - https://twitter.com/johndmcmaster/status/1152975472302575616 - Doesn't support voltage level tweaking -Doesn't support 8048

EMP-100

USB interface

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