Always liked those. Only someone elses money steered me towards Nikon F3s. When the T90s arrived one sodden wet day (of which there were many) an old friend came running and asked if I had a spare. He had one of the T90s and there was a wavy line in the viewfinder and the word help. They didn't like water.
Don't remember the F3 or the A1 suffering like that
I gave my old SLR Minolta plus lenses away to an A Level photography student. Couldn't find a buyer for it to be honest! Still have the Canon EOS 100D and the Zenith TTL... The Zenith is a marvel of Russian 1980s engineering!
Looking through the viewfinder all that I get is shutter speed and aperture displayed.
When the A1 is turned on, if you push the on/off button a red light by the wind on lever blinks rapidly, I believe that that indicates the battery strength, fast blink good battery/slow blink replace battery.
I've found the manual and there is no mention of a LED that blinks in the viewfinder.