Difference between revisions of "Talk:IMP interface"
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| − | Re DR11C. I peeked at the driver in 2.11BSD and I think it said Unibus. But it was only a brief glance. [[User:Larsbrinkhoff|Larsbrinkhoff]] ([[User talk:Larsbrinkhoff|talk]]) 10:11, 15 March 2018 (CET) | + | ==DR11C== |
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| + | Re DR11C. I peeked at the driver in 2.11BSD and I think it said Unibus. But it was only a brief glance. [[User:Larsbrinkhoff|Larsbrinkhoff]] ([[User talk:Larsbrinkhoff|talk]]) 10:11, 15 March 2018 (CET) | ||
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| + | Hey, this mentions UNIBUS: [https://www.retro11.de/ouxr/43bsd/usr/man/cat4/css.0.html] [[User:Larsbrinkhoff|Larsbrinkhoff]] ([[User talk:Larsbrinkhoff|talk]]) 10:19, 15 March 2018 (CET) | ||
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| + | : Huh? That page talks about the IMP11-A, the DEC CSS thing. | ||
| + | : Anyway, for the ''SRI'' thing, it was possibly both, actually. What it was was an SRI board that took the bit-stream from the IMP, doing the host-IMP harware protocol ('there's your bit', etc), and converted it to words, which it shipped over a parallel interface to a standard DEC DRV11 card. I'm pretty sure the QBUS DRV11 and UNIBUS DRV11-C had the same parallel port spec, so you could probably have plugged the SRI card into a DR11-C instead of a DRV11. Since the DR11-C/DRV11 are programmed I/O, they wouldn't have had the performance of the others, which were DMA, which is probably why UNIBUS machines tended to go with the DEC/ACC interfaces. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:55, 15 March 2018 (CET) | ||
Revision as of 16:55, 15 March 2018
DR11C
Re DR11C. I peeked at the driver in 2.11BSD and I think it said Unibus. But it was only a brief glance. Larsbrinkhoff (talk) 10:11, 15 March 2018 (CET)
Hey, this mentions UNIBUS: [1] Larsbrinkhoff (talk) 10:19, 15 March 2018 (CET)
- Huh? That page talks about the IMP11-A, the DEC CSS thing.
- Anyway, for the SRI thing, it was possibly both, actually. What it was was an SRI board that took the bit-stream from the IMP, doing the host-IMP harware protocol ('there's your bit', etc), and converted it to words, which it shipped over a parallel interface to a standard DEC DRV11 card. I'm pretty sure the QBUS DRV11 and UNIBUS DRV11-C had the same parallel port spec, so you could probably have plugged the SRI card into a DR11-C instead of a DRV11. Since the DR11-C/DRV11 are programmed I/O, they wouldn't have had the performance of the others, which were DMA, which is probably why UNIBUS machines tended to go with the DEC/ACC interfaces. Jnc (talk) 15:55, 15 March 2018 (CET)
