[arhiman57]

Thanks for this great deep dive of ressurecting this baby, so much usefull information, high end debug

If I understand correctly, It seems that this machine is the lowest possible Professional Series config ? (not the realiest due to 4D/60)

We don't really know the availabilioty date of the 4D/50, maybe fall 1987 (after 11/87 4D/70 annoucement ?), so if this system was delivered around spring 88, it will be very close to Clover2, and not so far from PI and Power Series as you say before. Maybe an additionnal discount was made, and if the system was focused on dev and no high end visualization, this config make maybe sense.

PS : i Found in comp.sys.Sgi that a person bought a new 4D/60 "single board set" in 11/87