SBC-1
VPE-141, VPE-241
Three thumbwheels located on the SBC on the left half of the SBC board.
Center thumbwheel is for setting the BOOT choice and can be changed without removing SBC from the frame.
BOOT switch is far left of three switches (BOOT, Halt/Run, RAM Disable/Enable).SBC-2
VPE-151
Three thumbwheels located on the SBC in the center of the board.
Center thumbwheel is for setting the BOOT choice and can be changed without removing SBC from frame.
BOOT switch is the left of the three centered switches (BOOT, Halt/Run, RAM Disable/Enable).SBC-3
VPE-131, VPE-141L, VPE-241L, VPE-251
Single thumbwheel located on the SBC just to the right of DF0.
Thumbwheel can be changed with removal of the front cover, may be hard to read without removing SBC from frame.
BOOT switch is far left of the two switches (BOOT, Halt/Run).SBC-4 1994
VPE-331, VPE-341, VPE-351
Single thumbwheel located on the SBC just to the right of DF0.
Thumbwheel can be changed with removal of the front cover, may be hard to read without removing SBC from frame.
BOOT switch is far left of the two switches (BOOT, Halt/Run).Hint: Distinguishing a VPE-241 from a VPE-241L: the floppy disk drive(s) are located on the SBC and centered vertically on the VPE-241L frame. The drive(s) are located on the bottom of the frame on the VPE-241 and do not come out when the SBC board is removed.
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