KE11-F Floating Instruction Set: Difference between revisions
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It requires the installation of the [[KE11-E Extended Instruction Set]], which allows the [[microcode]] of the basic CPU to be extended. | It requires the installation of the [[KE11-E Extended Instruction Set]], which allows the [[microcode]] of the basic CPU to be extended. | ||
The KE11-F includes its own microcode [[ | The KE11-F includes its own microcode [[read-only memory|ROM]], which provides an additional 8 bits width of microcode (to control the [[data path]]s and [[register]]s on the M7239), but it also uses microcode stored on the KE11-E, to control registers and data paths elsewhere. | ||
== | ==External links== | ||
* | * [http://bitsavers.org/pdf/dec/pdp11/1140/KE11_RefMan.pdf KE11-E and KE11-F instruction set options user's manual] (EK-KE11E-OP-001) | ||
* [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/EK-KE11E-TM-002%20KE11-E%20and%20KE11-F%20Instruction%20Set%20Options%20Manual.pdf KE11-E and KE11-F instruction set options manual] (EK-KE11E-TM-002) | |||
* [https://manx-docs.org/collections/hcps/KE11-FIS.pdf KE11-F floating instruction set (FIS) option engineering drawings] | |||
[[Category: PDP-11 Processors]] | [[Category: PDP-11 Processors]] | ||
Revision as of 15:15, 18 October 2021
The KE11-F Floating Instruction Set is the optional floating point unit for the KD11-A CPU of the PDP-11/40. It implements the PDP-11 FIS floating point, not the full FP11 floating point.
Physically, it consists of a single quad board, the M7239, which plugs into a pre-wired slot in the CPU backplane.
It requires the installation of the KE11-E Extended Instruction Set, which allows the microcode of the basic CPU to be extended.
The KE11-F includes its own microcode ROM, which provides an additional 8 bits width of microcode (to control the data paths and registers on the M7239), but it also uses microcode stored on the KE11-E, to control registers and data paths elsewhere.
