How can I get my HP 4mm DAT to work?

How can I get my HP 4mm DAT to work?

For HP25470/80A DDS:
MRS disabled: Set switches 3,6,7,8=0 and 1,2,4,5=1
MRS enabled: Set switches 3,6,7=0 and 1,2,4,5,8=1


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