Difference between revisions of "Talk:IMP interface"
From Computer History Wiki
(→DR11C: Yup, here's the 2.11 driver for it) |
(DM ITS = MIT-DMS.) |
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: Somewhere I have [[MOS operating system]] drivers for it. | : Somewhere I have [[MOS operating system]] drivers for it. | ||
: Also my memory was a bit off - it was byte at a time, not word at a time. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:14, 16 March 2018 (CET) | : Also my memory was a bit off - it was byte at a time, not word at a time. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 15:14, 16 March 2018 (CET) | ||
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| + | == Dynamic Modeling == | ||
| + | |||
| + | MIT-DM'''S''' wasn't a typo. Although the situation is confused with many different names over the years (DMCG is another prominent one), I believe the official ARPANET name was MIT-DMS. | ||
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| + | Here's a line from a 1980 MIT hosts list: | ||
| + | |||
| + | HOST MIT-DMS, 1/6,SERVER,ITS,PDP10,[DM,MITDM,MIT-DM,DMS] | ||
| + | |||
| + | So MIT-DM and plain DM were acceptable aliases. Other lists, e.g. https://github.com/ttkzw/hosts.txt, only says MIT-DMS with no aliases. | ||
Revision as of 06:32, 21 October 2021
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:
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)
- Sorry, wrong link. This is better:
- Yes, I see now DR11-C is the name of a parallel interface. The BSD drivers use the Unibus device to talk to the IMP interface.
- Here's a manual for the IMP interface:
- Larsbrinkhoff (talk) 08:36, 16 March 2018 (CET)
- Right. And here is the 2.11 driver:
- Looking at the driver, I'm not sure I understand how it works; it looks like it might loop in the interrupt handler, reading the entire packet? Eh, not important.
- Somewhere I have MOS operating system drivers for it.
- Also my memory was a bit off - it was byte at a time, not word at a time. Jnc (talk) 15:14, 16 March 2018 (CET)
Dynamic Modeling
MIT-DMS wasn't a typo. Although the situation is confused with many different names over the years (DMCG is another prominent one), I believe the official ARPANET name was MIT-DMS.
Here's a line from a 1980 MIT hosts list:
HOST MIT-DMS, 1/6,SERVER,ITS,PDP10,[DM,MITDM,MIT-DM,DMS]
So MIT-DM and plain DM were acceptable aliases. Other lists, e.g. https://github.com/ttkzw/hosts.txt, only says MIT-DMS with no aliases.
