"OverCurrent Protection actions" while programming old AM 27C128 EPROMs
solved. Short: upgrade the software to MiniPro v6.60, and the firmware to V03.2.80. With that version it works like a charm.
Long version: I was fixing a friends C=64 (dead hex inverter 7406 + flaky color SRAM) and while I was doing that I thought I will give them a nice JiffyDOS kernal
-- no good deed shall go unpunished!
I lifted the old MOS 251913 mask ROM out of the board, soldered in a preci-dip socket, tried the MOS chip, all OK. So I dumped the contents out (no idea why, actually. Mask ROM. It'll be there forever. Anyways.) Got JiffyDos (hat tip to Jim Brain!) got the BASIC (thx Bo Zimmerman, although one could just take the dump from the 251913 and overwrite it with JiffyDos with a 0x2000 offset) fired up the TL866, and got the dreaded Overcurrent Protection message. So after a bit of fiddling (EPROM good? Powered HUB? USB2.0 port? USB3.0 port? nada - none of these made ANY difference) I finally looked on the manufacturer's site for a new release, (I had 6.50), downloaded it, it immediately offered to upgrade the firmware on the burner and BAM! One written EPROM:
Let me tell you, C=64 output looks weird AF on a 4K TV - but cool nonetheless