Difference between revisions of "RH750 Massbus Adapter"
From Computer History Wiki
(→See also: +EK-RH750-TD; use Bitsavers copy of FMPS) |
(CMI config info is not RH750-specific - move to general /750 page) |
||
| Line 1: | Line 1: | ||
| − | The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU Memory Interconnect | + | The '''RH750 Massbus Adapter''' was a [[MASSBUS]] [[device controller]] for the [[VAX-11/750]]'s [[CPU/Memory Interconnect]] (CMI). |
| − | It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three CMI option slots. | + | It was implemented on one [[DEC card form factor|extended hex]] card, which mounts in the VAX-11/750 [[backplane]] in one of the three [[VAX-11/750#CMI_backplane_configuration|CMI option slots]]. |
A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7. | A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7. | ||
| − | It was common practice to have two separate RH750s, one for tape and another for disk devices. | + | It was common practice to have two separate RH750s, one for [[magnetic tape|tape]] and another for [[disk]] devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance. |
| − | Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance. | ||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
== See also == | == See also == | ||
Revision as of 04:04, 2 June 2022
The RH750 Massbus Adapter was a MASSBUS device controller for the VAX-11/750's CPU/Memory Interconnect (CMI).
It was implemented on one extended hex card, which mounts in the VAX-11/750 backplane in one of the three CMI option slots.
A VAX-11/750 could have up to three RH750 Adapters, the first one goes into CMI slot 9, the second into slot 8, and the third in slot 7.
It was common practice to have two separate RH750s, one for tape and another for disk devices. Combining both on one RH750 was possible, but tape usage had a negative impact on disk performance.
See also
- RH750 Massbus Adapter Technical Description (EK-RH750-TD) - not available online
External links
- RH750 Field Maintenance Print Set (MP-01045)
