Difference between revisions of "DA11-B DMA UNIBUS Link"
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In Block Mode, the DA11-B uses [[Direct Memory Access|DMA]] on the source bus to read words in the block, and then uses DMA on the other UNIBUS to write the data. | In Block Mode, the DA11-B uses [[Direct Memory Access|DMA]] on the source bus to read words in the block, and then uses DMA on the other UNIBUS to write the data. | ||
− | The DA11-B | + | The DA11-B was produced by [[Digital Equipment Corporation|DEC]]'s Computer Special System division; it was built out of a pair of [[DR11-B parallel interface]]s, each taking a [[system unit]] [[backplane]] in each computer. An M7229 buffer module is installed in each DR11-B's user connection slot, [[DEC edge connector contact identification|CD0]]. |
− | [[DEC edge connector contact identification|CD0]]. | ||
==Registers== | ==Registers== |
Latest revision as of 03:26, 30 August 2022
The DA11-B DMA UNIBUS Link allows two UNIBUSes to be directly connected; either single words, or blocks of up to 32K words, can be transferred. The channel is half-duplex. Although the DA11-B can generate interrupts on either UNIBUS (in response to user commands given directly to it via its Control and Status Register), it cannot transfer interrupts (i.e. from one UNIBUS to the other).
In Block Mode, the DA11-B uses DMA on the source bus to read words in the block, and then uses DMA on the other UNIBUS to write the data.
The DA11-B was produced by DEC's Computer Special System division; it was built out of a pair of DR11-B parallel interfaces, each taking a system unit backplane in each computer. An M7229 buffer module is installed in each DR11-B's user connection slot, CD0.
Registers
Register | Address |
---|---|
Word count Register | XXXX00 |
Bus Address Register | XXXX02 |
Control and Status Register | XXXX04 |
Data Buffer Register | XXXX06 |
The first DA11-B in a system is usually assigned register addresses starting with 0772410.
External links
- DA11-B PDP-11 Interprocessor Link
- DR11-B/DA11-B manual (EK-DR11B-TM-004) - the DA11-B is covered in Appendix C
- pdp11 peripherals handbook - the DA11-B is covered on pp. 83-87