IRIS update/PM2 questions

[compoobah at valleyimplants.com]

Took a few looks at the IRIS, and it seems to be a Frankensiggy. 31xx graphics. 2000 series processor (PM2/PM2M1/SKYFFP, 68010) with ST-506 drives (safely unplugged now, don't know what's on them) Looks like the DIPS are set wrong (gives an HALT-E on the back panel, looks like memory? does anyone know?). I've been looking at the 68k IRIS FAQ, but most of that deals with 2000Turbo and 3000 models

 Does anybody know 
 (a) what the 26-pin header on the front of the PM2 is? it's between the bridge to the GFX and the 8-pos DIP. Currently unconnected, should it be? Pictures of a 2400/2500 would help.
 (b) what are the switch settings? 3 switches on the PM2 (one on the edge, two mounted amongst the chips)
 (c) PM2M1 switch settings- are they like IM1 (IRIS 3000 memory)