Rescued: HP85, HP86B, 912x drives - score!

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Hi list,

I pulled the following from a skip (or dumpster as you North Americans
would have it!):

http://img163.echo.cx/my.php?image=hp854qg.jpg (5 x HP85 computers)
http://img263.echo.cx/my.php?image=hp86b4wy.jpg (3 x HP86B computers)
http://img263.echo.cx/my.php?image=hpdrives8zh.jpg (5 x HP9121 dual
drives, 1 x HP9122 dual drive)

Is there anything specific to these machines I should check (aside
from the obligatory stuff-from-a-dumpster drying-out period) before
trying to power them on? I haven't got a monitor that will do the NTSC
composite from the HP86Bs at the moment so I can't really try those,
but I can try the HP85s and the drives if it's OK to.

Thanks,

Ed.