Dave,
SR/MC/MD lenses will not work on A mount. You need to use an optical adapter which completely defeats the lens, and will have no automation. Or you need to do a mount swap, which will still result in no automation.
Don't even bother with that old lens. Just buy the Sony 2.8/50 macro. It's the same as the Minolta 2.8/50 macro and very good. Since you don't own one of those old MD lenses, there is no reason to bother with them at all.
EPd,
BH refers to them as KM lenses. It's just simpler for them to do that than have Minolta and Konicia-Minolta as separate listings. And for a lot of items there is so little of either left it doesn't much matter. Also they have had the header as Konica-Minolta in the past even when most the lenses shipped by KM were straight up Minolta. There was only ever 5 lenses made with the KM badging on them (17-35, 28-75, 11-18, 18-70, 18-200) all others were still Minoltas even during the minolta times. The evolution of the mount makes things messy, but in the end, just like when companies buy another company. Everything becomes the current. So Minolta stuff became Konica Minolta even if it still said Minolta.