Difference between revisions of "RH20 MASSBUS controller"
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An '''RH20 MASSBUS controller''' is the primary [[secondary storage]] [[device controller]] for the later [[KL10]]s (the ones with so-called 'internal' [[main memory]]). It works with [[MASSBUS]] [[disk]] [[drive]]s and [[magnetic tape drive]]s (such as the [[RP06 disk drive|RP06]], etc, series drives); up to 8 drives per RH20. | An '''RH20 MASSBUS controller''' is the primary [[secondary storage]] [[device controller]] for the later [[KL10]]s (the ones with so-called 'internal' [[main memory]]). It works with [[MASSBUS]] [[disk]] [[drive]]s and [[magnetic tape drive]]s (such as the [[RP06 disk drive|RP06]], etc, series drives); up to 8 drives per RH20. | ||
| − | The RH20 is connected to both the E Bus and the C Bus of the KL10; the former to allow the [[Central Processing Unit|CPU]] to control it. and the latter to give the RH20 direct access to the main memory of the system, to allow it to use [[Direct Memory Access|DMA]] to move data directly from devices to main memory, without needing CPU intervention. | + | The RH20 is connected to both the [[KL10|E Bus]] and the C Bus of the KL10; the former to allow the [[Central Processing Unit|CPU]] to control it. and the latter to give the RH20 direct access to the main memory of the system, to allow it to use [[Direct Memory Access|DMA]] to move data directly from devices to main memory, without needing CPU intervention. |
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| + | ==Implementation== | ||
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| + | Each RH20 consists of a set of three [[DEC card form factor|hex]] [[printed circuit board|board]]s (M8555, M8556, | ||
| + | M8557), inserted in the KL10's [[KL10#Construction|I/O backplane]] (along with the [[DTE20 Ten-Eleven Interface|DTE20s]]). | ||
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| + | {{semi-stub}} | ||
==See also== | ==See also== | ||
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== External links == | == External links == | ||
| + | * [http://bitsavers.org/pdf/dec/pdp10/KL10/EK-RH20-UD-001_RH20_Unit_Description_Aug76.pdf RH20 Unit Description] | ||
| + | * [http://bitsavers.org/pdf/dec/pdp10/KL10/MP00056_RH20_Apr81.pdf RH2O Field Maintenance Print Set] | ||
* [http://www.inwap.com/pdp10/rh20.txt Tony in RH20 Land] - An account of Tony Wachs adding RH20 support to TOPS-10. | * [http://www.inwap.com/pdp10/rh20.txt Tony in RH20 Land] - An account of Tony Wachs adding RH20 support to TOPS-10. | ||
Revision as of 16:42, 14 October 2021
An RH20 MASSBUS controller is the primary secondary storage device controller for the later KL10s (the ones with so-called 'internal' main memory). It works with MASSBUS disk drives and magnetic tape drives (such as the RP06, etc, series drives); up to 8 drives per RH20.
The RH20 is connected to both the E Bus and the C Bus of the KL10; the former to allow the CPU to control it. and the latter to give the RH20 direct access to the main memory of the system, to allow it to use DMA to move data directly from devices to main memory, without needing CPU intervention.
Implementation
Each RH20 consists of a set of three hex boards (M8555, M8556, M8557), inserted in the KL10's I/O backplane (along with the DTE20s).
See also
External links
- RH20 Unit Description
- RH2O Field Maintenance Print Set
- Tony in RH20 Land - An account of Tony Wachs adding RH20 support to TOPS-10.
