7.5.3 is original with enabler would be fine but why didn't 7.6.1 cd rom work? Floppies I get no enabler even tho its 7.6.1, but probably stripped down 7.5. The 8.1 worked so I'm guessing 7.5.5 system or 7.6. Ill live with 8.1. I have 2 190's so no biggie. Soon I need to try and recap the screen on my 160 as external video works but screen has backlight but no screen showing.