Difference between revisions of "RC11 disk controller"

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The '''RC11''' controller for the [[UNIBUS]] is a very early [[secondary storage]] controller for the [[PDP-11]]. It can handle up to 4 [[RS64 disk drive|RS64]] fixed-[[head]] [[magnetic storage|magnetic]] [[disk]] drives, each with a capacity of 128 Kbytes of storage, organized in 32-word blocks.
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The '''RC11''' [[device controller]] for the [[UNIBUS]] is a very early [[secondary storage]] controller for the [[PDP-11]]. It can handle up to 4 [[RS64 disk drive|RS64]] [[fixed-head disk]] drives, each with a capacity of 128 Kbytes of storage, organized in 32-word blocks.
  
 
The contents of each block are protected by a [[Cyclic redundancy check|CRC]].
 
The contents of each block are protected by a [[Cyclic redundancy check|CRC]].
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| Bad Address || colspan=2 | Unused || colspan=2 | Unit Number || colspan=5 | Track Number || colspan=6 | Sector Address
 
| Bad Address || colspan=2 | Unused || colspan=2 | Unit Number || colspan=5 | Track Number || colspan=6 | Sector Address
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===777442: Disk Address Register (RCDA)===
 
===777442: Disk Address Register (RCDA)===
 
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| colspan=3 | Unused || colspan=2 | Unit Number || colspan=5 | Track Number || colspan=6 | Sector Address
 
| colspan=3 | Unused || colspan=2 | Unit Number || colspan=5 | Track Number || colspan=6 | Sector Address
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===777444: Disk Error Status Register (RCES)===
 
===777444: Disk Error Status Register (RCES)===
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| colspan=16 | WC15 <---> WC00
 
| colspan=16 | WC15 <---> WC00
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===777452: Current Address Register (RCCA)===
 
===777452: Current Address Register (RCCA)===
 
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| colspan=15 | BA15 <---> BA01 || Unused
 
| colspan=15 | BA15 <---> BA01 || Unused
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===777454: Maintenance Register (RCMN)===
 
===777454: Maintenance Register (RCMN)===
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| colspan=16 | DB15 <---> DB00
 
| colspan=16 | DB15 <---> DB00
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==Implementation==
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The RC11 is composed of a number of [[printed circuit board|boards]] (three [[DEC card form factor|quad]], 5 single) mounted in a 4-slot [[system unit]] [[backplane]]. The quad cards are:
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* M7219 - Bus Interface
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* M7221 - Disk Interface
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* M7222 - Status Control
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Single:
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* M7220 - Clock Control
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* M7224 - Unit and Track Selector
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* M7225 - Status Control Extender
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* M796 - UNIBUS Master Control
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* [[M782 Interrupt Control]]
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==External links==
  
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* [http://www.bitsavers.org/pdf/dec/unibus/DEC-11-HRCA-D_RC11_disc_control_manual.pdf RC11 disk control manual] (DEC-11-HRCA-D)
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* [http://www.bitsavers.org/pdf/dec/unibus/RC11_RevB_Engineering_Drawings_Nov71.pdf RC11 engineering drawings]
  
 
[[Category:UNIBUS Storage Controllers]]
 
[[Category:UNIBUS Storage Controllers]]

Latest revision as of 02:14, 10 December 2021

The RC11 device controller for the UNIBUS is a very early secondary storage controller for the PDP-11. It can handle up to 4 RS64 fixed-head disk drives, each with a capacity of 128 Kbytes of storage, organized in 32-word blocks.

The contents of each block are protected by a CRC.

Device registers

Register Abbreviation Address
Look Ahead Register RCLA 777440
Disk Address Register RCDA 777442
Disk Error Status Register RCER 777444
Disk Control and Status Register RCCS 777446
Word Count Register RCWC 777450
Current Address Register RCCA 777452
Maintenance Register RCMN 777454
Data Buffer Register RCDB 777456

777440: Look Ahead Register (RCLA)

Bad Address Unused Unit Number Track Number Sector Address
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777442: Disk Address Register (RCDA)

Unused Unit Number Track Number Sector Address
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777444: Disk Error Status Register (RCES)

Data Late Block Check Data Sync NXM Unused Timing Track Unused Address Parity Sync Address Disk Overflow Missed Xfer Unused
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777446: Disk Control and Status Register (RCCS)

Special Condition Data Error Address Error Write Lock NXD Write Check Inhibit Address Abort Ready Interrupt Enable Ext Mem Mode Function Go
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777450: Word Count Register (RCWC)

WC15 <---> WC00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777452: Current Address Register (RCCA)

BA15 <---> BA01 Unused
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777454: Maintenance Register (RCMN)

Unit Select Write Enable Word Count DMA Request Address Found Clock Polarity DMA Enable Data Track Address Track Phase Lock Address Mark Data Mark Clock Track
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

777456: Data Buffer Register (RCDB)

DB15 <---> DB00
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Implementation

The RC11 is composed of a number of boards (three quad, 5 single) mounted in a 4-slot system unit backplane. The quad cards are:

  • M7219 - Bus Interface
  • M7221 - Disk Interface
  • M7222 - Status Control

Single:

  • M7220 - Clock Control
  • M7224 - Unit and Track Selector
  • M7225 - Status Control Extender
  • M796 - UNIBUS Master Control
  • M782 Interrupt Control

External links

Retrieved from "https://gunkies.org/w/index.php?title=RC11_disk_controller&oldid=24861"