Difference between revisions of "IMP11-A ARPANET interface"

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The '''IMP11-A ARPANET interface''' is a [[UNIBUS]] [[network interface]] produced by [[Digital Equipment Corporation|DEC]]'s Computer Special System division to allow a machine to connect to an [[ARPANET]] [[Interface Message Processor|IMP]].
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The '''IMP11-A ARPANET interface''' was a [[network interface]] produced by [[Digital Equipment Corporation|DEC]]'s Computer Special System division for the a [[UNIBUS]], which provided an [[1822 interface]]; the latter could connect to anything that provided a BBN-1822 bit-serial interface, most commonly including [[IMP interface]]s to [[ARPANET]] [[Interface Message Processor|IMP]]s, but also [[Packet Radio Network]] interfaces.
  
It consists of a [[BA11-E Mounting Box]] holding a pair of [[DR11-B parallel interface]]s (one for [[packet]] input, and one for output), and a custom [[backplane]] holding a number of M-series [[FLIP CHIP]]s to interface to the IMP, including producing the bit serial input and output. Level converters allow use as either a Local Host or Distant Host interface.
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It consists of a [[BA11-E Mounting Box]] holding a pair of [[DR11-B parallel interface]]s (the [[Direct Memory Access|DMA]] type of DR11 - one for [[packet]] input, and one for output), and a custom [[backplane]] holding a number of M-series [[FLIP CHIP]]s to interface to the IMP, including producing the bit serial input and output. Level converters allow use as either a Local Host or Distant Host interface.
  
 
==Registers==
 
==Registers==
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{{16bit-bitout}}
 
{{16bit-bitout}}
  
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==External links==
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* [http://www.bitsavers.org/pdf/dec/unibus/IMP11-A_PDP-11_Host_to_IMP_Interface_Feb1975.pdf IMP11-A PDP-11 Host to IMP Full Duplex NPR Interface]
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[[Category: 1822 Interfaces‎]]
 
[[Category: UNIBUS Network Interfaces]]
 
[[Category: UNIBUS Network Interfaces]]

Latest revision as of 03:19, 30 August 2022

The IMP11-A ARPANET interface was a network interface produced by DEC's Computer Special System division for the a UNIBUS, which provided an 1822 interface; the latter could connect to anything that provided a BBN-1822 bit-serial interface, most commonly including IMP interfaces to ARPANET IMPs, but also Packet Radio Network interfaces.

It consists of a BA11-E Mounting Box holding a pair of DR11-B parallel interfaces (the DMA type of DR11 - one for packet input, and one for output), and a custom backplane holding a number of M-series FLIP CHIPs to interface to the IMP, including producing the bit serial input and output. Level converters allow use as either a Local Host or Distant Host interface.

Registers

Register Abbreviation Address
Transmit Word Count Register TXWCR 772410
Transmit Bus Address Register TXBAR 772412
Transmit Command/Status Register TXCSR 772414
Transmit Data Buffer Register TXDBR 772416
Receive Word Count Register RXWCR 772430
Receive Bus Address Register RXBAR 772432
Receive Command/Status Register RXCSR 772434
Receive Data Buffer Register RXDBR 772436

772410: Transmit Word Count Register (TXWCR)

WC15 <---> WC00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772412: Transmit Bus Address Register (TXBAR)

BA15 <---> BA00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772414: Transmit Command/Status Register (TXCSR)

ERR NEX ATTN MAINT Unused CYCLE RDY IE XBA16-17 Unused LAST BIT TX CLR GO
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772416: Transmit Data Buffer Register (TXDBR)

Data15 <---> Data00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772430: Receive Word Count Register (RXWCR)

WC15 <---> WC00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772432: Receive Bus Address Register (RXBAR)

BA15 <---> BA00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772434: Receive Command/Status Register (RXCSR)

ERR NEX ATTN MAINT EOM IMP NRDY RDY ERR CYCLE RDY IE XBA16-17 RX ENBL HOST RDY RX CLR GO
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

772436: Receive Data Buffer Register (RXDBR)

Data15 <---> Data00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

External links