Difference between revisions of "RH20 MASSBUS controller"
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* [http://bitsavers.org/pdf/dec/pdp10/KL10/MP00056_RH20_Apr81.pdf RH2O Field Maintenance Print Set] | * [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. | ||
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[[Category: MASSBUS Controllers]] | [[Category: MASSBUS Controllers]] | ||
[[Category: PDP-10 Peripherals]] | [[Category: PDP-10 Peripherals]] | ||
Revision as of 15:44, 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.
