View source for KE11-B Extended Arithmetic Element

The '''KE11-B Extended Arithmetic Element''' is a [[program compatible]] re-implementation (on a single [[DEC card form factor|hex]] board - the M7840) of the [[KE11-A Extended Arithmetic Element]], an [[Extended Arithmetic Element]] built as an autonomous [[UNIBUS]] [[peripheral]], which can perform a variety of arithmetic or logical operations:

* multiplication
* division
* multi-bit shifts
** logical shift
** arithmetic shift
** [[normalization]]

(The last is used for carrying out [[floating point]] computations in [[software]].)

The original KE11-A was 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-B can likewise be used with these later models.

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==Further reading==

* ''KE11-B User Manual'' (EK-KE11B-OP) - not online
* ''KE11-B Maintenance Manual'' (EK-KE11B-MM) - not online, available in fiche

==External links==

* [http://wwcm.synology.me/pdf/KE11-B%20Arithmetic%20Unit%20Engineering%20Drawings.pdf KE11-B Engineering Drawings]

[[Category: PDP-11s]]
[[Category: UNIBUS]]