Difference between revisions of "KE11-B Extended Arithmetic Element"
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| + | (The last is used for implementation of [[floating point]] 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 be used with these later models. | ||
Revision as of 12:07, 7 January 2020
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 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 implementation of floating point 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 be used with these later models.
