HP 98568A Installation Instruction page 217

HP 98726A Interface Card
b. The jumper JPl determines the memory location for the card's control
space in DIO-I. The default position of JPl is shown in Figure 5-57.
Figure 5-57.
HP 98726A Jumper # 1 Default Position
The card's control space can be at $200000 (default and recommended)
or at $800000.
Caution
You must know exactly what you are doing when you use
jumper JPl in the $800000 position. Be absolutely sure that no
other use of that area of memory is being made. Unpredictable
results will occur if other software/hardware attempt to use
memory location $800000.
Adding Interface Cards 5-121