Difference between revisions of "KE11-A Extended Arithmetic Element"

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The KE11-A was originally produced for use with the [[PDP-11/20]], whose [[KA11 CPU]] did not have multply, divide, or multi-bit shift operations. As a UNIBUS peripheral, not integrated into the [[Central Processing Unit|CPU]], it was also usable with other models, e.g. the [[PDP-11/05]] and [[PDP-11/04]], which likewise did not implement multiplication in [[hardware]], etc.
 
The KE11-A was originally produced for use with the [[PDP-11/20]], whose [[KA11 CPU]] did not have multply, divide, or multi-bit shift operations. As a UNIBUS peripheral, not integrated into the [[Central Processing Unit|CPU]], it was also usable with other models, e.g. the [[PDP-11/05]] and [[PDP-11/04]], which likewise did not implement multiplication in [[hardware]], etc.
  
The KE11-A can be operated with an optional [[KM11-A Maintenance Set]] in order to diagnose faults. It was replaced by the [[KE11-B Extended Arithmetic Element]], a re-implementation on a single quad card.
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The KE11-A can be operated with an optional [[KM11-A Maintenance Set]] in order to diagnose faults. It was replaced by the [[KE11-B Extended Arithmetic Element]], a program-compatible re-implementation on a single quad card.
  
 
==Hardware==
 
==Hardware==

Revision as of 18:54, 26 January 2020

The KE11-A Extended Arithmetic Element is an autonomous UNIBUS peripheral which can perform a variety of arithmetic or logical operations:

  • multiplication
  • division
  • multi-bit shifts

(The last is used for implementation of floating point in software.)

It is implemented as several quad and dual boards, plugged into a custom four-slot system unit (details below).

The KE11-A was originally produced for use with the PDP-11/20, whose KA11 CPU did not have multply, divide, or multi-bit shift operations. As a UNIBUS peripheral, not integrated into the CPU, it was also usable with other models, e.g. the PDP-11/05 and PDP-11/04, which likewise did not implement multiplication in hardware, etc.

The KE11-A can be operated with an optional KM11-A Maintenance Set in order to diagnose faults. It was replaced by the KE11-B Extended Arithmetic Element, a program-compatible re-implementation on a single quad card.

Hardware

The KE11-A consists of 3 quad boards:

  • M7210 Data Control
  • M7211 Register Control
  • M827 Clock and States

and a pair of M234 Register dual-height boards, plugged into the quad custom backplane.

Board locations

These are the board locations for the KE11-A (as seen from the board side of the backplane):

Connector
Slot A B C D E F
1 UNIBUS In M7210 Data Control
2 Unused KM11-A M234 Register
(low byte)
M234 Register
(high byte)
3 G772
Power
Reserved M7211 Register Control
4 UNIBUS Out M827 Clock & States