Difference between revisions of "RH20 MASSBUS controller"
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| − | An 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 | + | 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. |
==See also== | ==See also== | ||
Revision as of 12:28, 4 July 2019
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.
See also
External links
- Tony in RH20 Land - An account of Tony Wachs adding RH20 support to TOPS-10.
