KE11-B Extended Arithmetic Element: Difference between revisions
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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 autonomous [[UNIBUS]] [[peripheral]] which can perform a variety of arithmetic or logical operations: | 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 | * multiplication | ||
| Line 8: | Line 8: | ||
** [[normalization]] | ** [[normalization]] | ||
(The last is used for | (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 be used with these later models. | 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. | ||
{{PDP-11s}} | {{PDP-11s}} | ||
[[Category: PDP-11s]] | [[Category: PDP-11s]] | ||
Revision as of 12:37, 5 May 2021
The KE11-B Extended Arithmetic Element is a program compatible re-implementation (on a single 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 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.
