NEC UPD98413 User Manual page 278

D4 PREICR 1: Loads the path REI counter. 0: Indicates completion of loading.
D3 LREICR 1: Loads the line REI counter. 0: Indicates completion of loading.
D2 B3ECR 1: Loads the B3 error counter. 0: Indicates completion of loading.
D1 B2ECR 1: Loads the B2 error counter. 0: Indicates completion of loading.
D0 B1ECR 1: Loads the B1 error counter. 0: Indicates completion of loading.
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CHAPTER 5 REGISTERS
PRELIMINARY
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