#1
I was just wondering is the only footswitch for the 6505+ 112 Combo the two button footswitch or can you use the three button switch that goes to the 6505 Head. and my second question. Does the 6505 212 combo use the same switch as the 6505 head ?
#2
the 112 uses a windsor/valveking switch. NOT the 6505 head switch
the 212 uses the 6505 head switch
Gear:

Ibanez RG4EXFM1
Shecter Hellraiser Crimson Burst
Peavey 6505+ 112
Line6 Spider IV
Dunlop CryBaby Original:
#3
AFAIK, the 112 & 212 both use the same footswitch, I believe they're both just simple stereo jack cable switches. The 6505 head I believe also uses that switch. Not sure. The 6505+ head definitely uses a MIDI switch though.
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Ibanez RGA42E
Ibanez S420
LTD H-301
Ibanez RG520
Peavey Predator USA
Douglas Grendel 725
Line 6 Pod HD500X