I really am unsure. Around 4 i think!
I really need to get some time to take care of my collection and see what works still.
I certianly have 2 a1200's which me and a friend bought at the same time in oct 1994 after getting student loans! Though they both lost the upper rf sheild a long time ago to easier accomodate a decent sized hard drive (whoa the cost of 2.5 inch drives back then!), one has an 040 but i would need a fan/heatsync if I ever were to run it as that has dissaperared.
I also believe I have 2 a500's of some kind, one certainly is a plus.
I certainly would like more but they really sell for more than they are worth to any sane person these days!