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]]. | 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]]. | ||
| − | 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. | + | 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== | ||
Revision as of 14:56, 28 October 2021
The IMP11-A ARPANET interface is a UNIBUS network interface produced by DEC's Computer Special System division to 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 (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.
Contents
- 1 Registers
- 1.1 772410: Transmit Word Count Register (TXWCR)
- 1.2 772412: Transmit Bus Address Register (TXBAR)
- 1.3 772414: Transmit Command/Status Register (TXCSR)
- 1.4 772416: Transmit Data Buffer Register (TXDBR)
- 1.5 772430: Receive Word Count Register (RXWCR)
- 1.6 772432: Receive Bus Address Register (RXBAR)
- 1.7 772434: Receive Command/Status Register (RXCSR)
- 1.8 772436: Receive Data Buffer Register (RXDBR)
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 |
