# D # A / # R # F D ROM A 3000/3 D CD11 Card reader A 2460/9 R 2460 CDST Status and control register R 2462 CDCC Column count register R 2464 CDBA Current address register R 2466 CDDB Data buffer register D CR11/CM11 Card reader R 7160 CRS Status register R 7162 CRB1 Data buffer register 1 R 7164 CRB2 Data buffer register 2 D DH11 16-line serial multiplexer F 20 R 00 DHSCR System control register R 02 DHNRC Next received character R 04 DHLPR Line parameter register R 06 DHCAR Current address register R 10 DHBCR Byte count register R 12 DHBAR Buffer active register R 14 DHBRK Break control register R 16 DHSIL Silo status register D DJ11 16-line serial multiplexer F 10 R 00 DJCSR Control status register R 02 DJRBUF Receive buffer R 04 DJTCR Transmitter control R 04 DJBCR Break control register R 06 DJTBUF Transmit buffer D DL11 1-line serial interface (console) A 7560/9 F 10 R 0 RCSR Receive status register R 2 RBUF Receive data buffer R 4 XCST Transmit status register R 6 XBUF Transmit buffer D DMC11 Network link F 10 D DN11 Automatic calling unit A 5200/5 (1 word each) D DQ11 NPR Synchronous line interface F 10 R 0 RXSTAT Receive status register R 2 TXSTAT Transmit status register R 4 REGERR Reg/Err register R 6 SECREG Secondary register D DR11-B DMA controller A 2410/9 R 2410 DRWC Word count R 2412 DRBA Bus address R 2414 DRST Status and command R 2416 DRDB Data buffer D PC11 Paper tape reader/punch A 7550/ R 7550 PRS Reader status register R 7552 PRB Reader buffer R 7554 PPB Punch status R 7556 PPB Punch buffer