In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mghodge wrote:

Resonators and crystals are okay to leave in during programming.  TTL oscillators are not as they can not tolerate the 12.5v programming voltage.  I had an old serial SX-Key go bad recently.  I noticed occasionally it would just lock up and draw several hundred mA.  Had I set the current limiting on my power supply correctly I might not have burned the key up.

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