IMP11-A ARPANET interface: Difference between revisions

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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 connect allow a machine to connect to an [[ARPANET]] [[Interface Message Processor|IMP]].
The '''IMP11-A ARPANET interface''' is a [[UNIBUS]] [[network interface]] produced by [[Digital Equipment Corporation|DEC]]'s Computer Special System division to connect allow a machine to connect to an [[ARPANET]] [[Interface Message Processor|IMP]].


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.
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. Level converters allow use as either a Local Host or Distant Host interface.
 
==Registers==
 
{| border=1
! 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)===
{{16bit-header}}
| colspan=16 | WC15 <---> WC00
{{16bit-bitout}}
 
===772412: Transmit Bus Address Register (TXBAR)===
{{16bit-header}}
| colspan=16 | BA15 <---> BA00
{{16bit-bitout}}
 
===772414: Transmit Command/Status Register (TXCSR)===
{{16bit-header}}
| ERROR || NEX || ATTN || MAINT || colspan=3 | Unused || CYCLE || READY || IE || colspan=2 | XBA16-17 || Unused || LAST BIT || TX CLR || GO
{{16bit-bitout}}
 
===772416: Transmit Data Buffer Register (TXDBR)===
{{16bit-header}}
| colspan=16 | Data15 <---> Data00
{{16bit-bitout}}
 
===772430: Receive Word Count Register (RXWCR)===
{{16bit-header}}
| colspan=16 | WC15 <---> WC00
{{16bit-bitout}}
 
===772432: Receive Bus Address Register (RXBAR)===
{{16bit-header}}
| colspan=16 | BA15 <---> BA00
{{16bit-bitout}}
 
===772434: Receive Command/Status Register (RXCSR)===
{{16bit-header}}
| ERROR || NEX || ATTN || MAINT || EOM || IMP NRDY || RDY ERR || CYCLE || READY || IE || colspan=2 | XBA16-17 || RX ENBL || HOST RDY || RX CLR || GO
{{16bit-bitout}}
 
===772436: Receive Data Buffer Register (RXDBR)===
{{16bit-header}}
| colspan=16 | Data15 <---> Data00
{{16bit-bitout}}


[[Category: UNIBUS Peripherals]]
[[Category: UNIBUS Peripherals]]
[[Category: Network Interfaces]]
[[Category: Network Interfaces]]

Revision as of 17:15, 30 November 2018

The IMP11-A ARPANET interface is a UNIBUS network interface produced by DEC's Computer Special System division to connect allow a machine to connect to an ARPANET IMP.

It consists of a BA11-E Mounting Box holding a pair of DR11-B parallel interfaces (one for packet input, and one for output), and a custom backplane holding a number of M-series FLIP CHIPs. 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)

ERROR NEX ATTN MAINT Unused CYCLE READY 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)

ERROR NEX ATTN MAINT EOM IMP NRDY RDY ERR CYCLE READY 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
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