Service manual

Table 4–11 (Cont.): <REFERENCE>(XRP) Internal Processor Reg-

isters

System Base SBR IPR12 R/W 1

System Length SLR IPR13 R/W 1

Reserved IPR14–IPR15 3

Process Control Block Base PCBB IPR16 R/W 1

System Control Block Base SCBB IPR17 R/W 1

Interrupt Priority Level IPL IPR18 R/W 1 I

AST Level ASTLVL IPR19 R/W 1 I

Software Interrupt Request SIRR IPR20 W 1

Software Interrupt Summary SISR IPR21 R/W 1 I

Reserved IPR22–IPR23 3

Interval Counter Control and

Status

ICCS IPR24 R/W 2 I

Reserved IPR25–IPR26 3

Time-of-Year Clock TODR IPR27 R/W 1

Console Storage Receiver Status CSRS IPR28 R/W 5 I

Console Storage Receiver Data CSRD IPR29 R 5 I

Console Storage Transmitter Status CSTS IPR30 R/W 5 I

Console Storage Transmitter Data CSTD IPR31 W 5 I

Console Receiver Control/Status RXCS IPR32 R/W 2 I

Console Receiver Data Buffer RXDB IPR33 R 2 I

Console Transmitter Control/Status TXCS IPR34 R/W 2 I

Console Transmitter Data Buffer TXDB IPR35 W 2 I

Reserved IPR36–IPR37 3

Machine Check Error Summary MCESR IPR38 W 2

Reserved IPR39 3

Accelerator Control and Status ACCS IPR40 R/W 2 I

Reserved IPR41 3

<REFERENCE>(XRP) Scalar Processor 4–61