FP11-A Floating-Point Processor - Revision history

Jnc: Better cat

2022-10-13T00:17:02Z

Better cat

Jnc: Details on expanded microcode

2022-02-13T12:04:24Z

Details on expanded microcode

Jnc: clarify "high half"

2022-02-09T11:13:11Z

clarify "high half"

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2022-01-12T20:28:10Z

clarify

Jnc: Implementation details; + manuals, FMPS

2022-01-12T15:01:23Z

Implementation details; + manuals, FMPS

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2020-06-14T02:04:02Z

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2018-12-19T23:05:39Z

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2018-10-18T19:52:23Z

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2017-12-06T16:34:26Z

clarify

Jnc: An OK stub

2017-10-31T02:17:01Z

An OK stub

New page

The '''FP11-A Floating-Point Processor''' is the optional hardware [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It supports the full [[PDP-11]] [[FP11 floating point]].

It consists of a single [[DEC card form factor|hex]] board, the M8267. Its connections to the KD11-EA include two over-the-top connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card.

The latter over-the-top connector uses the connectors which normally hold the maintenance cables to the [[KY11-LB Programmer's Console]]; in systems with a KY11-LB, the cables to the console will now connect to the M8267 card. (This is all necessitated because the FP11-A needs access to signals carried over the maintenance cables.)

{{stub}}

{{PDP-11}}

← Older revision		Revision as of 00:17, 13 October 2022
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	* [http://wwcm.synology.me/pdf/MP00189%20FP11-A%20Field%20Maintenance%20Print%20Set.pdf FP11-A Field Maintenance Print Set] (MP00189) - contains the FP11-A microcode on pp. 42-89		* [http://wwcm.synology.me/pdf/MP00189%20FP11-A%20Field%20Maintenance%20Print%20Set.pdf FP11-A Field Maintenance Print Set] (MP00189) - contains the FP11-A microcode on pp. 42-89

−	[[Category: PDP-11 Processors]]	+	[[Category: PDP-11 UNIBUS Processors]]

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 The '''FP11-A Floating-Point Processor''' is the optional [[hardware]] [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It consists of a single [[DEC card form factor|hex]] board, the '''M8267'''. It supports the full [[PDP-11]] [[FP11 floating point]].
-The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used in floating point [[instruction]]s, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for floating point instructions for the CPU is contained on the CPU's M8266 card; the portion of the microcode there used for floating point instructions is the high half of the microcode [[address space]] (which is increased by one bit in the KD11-EA over that in the [[KD11-E CPU|KD11-E]]).
+The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used in floating point [[instruction]]s, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each.
 The FP11-A's connections to the KD11-EA include two [[over the back]] connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card. (This was likely because the [[PDP-11/34]] could be field-upgraded from a [[KD11-E CPU]], which did not support the floating point unit, to a KD11-EA, which did - but its original [[DD11-P backplane]] was retained.)
 ==Installation==

@@ Line 3: / Line 3: @@
 The '''FP11-A Floating-Point Processor''' is the optional [[hardware]] [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It consists of a single [[DEC card form factor|hex]] board, the '''M8267'''. It supports the full [[PDP-11]] [[FP11 floating point]].
-The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used in floating point [[instruction]]s, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for floating point instructions for the CPU is contained on the CPU's M8266 card; the portion of the microcode there used for floating point instructions is the high half.
+The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used in floating point [[instruction]]s, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for floating point instructions for the CPU is contained on the CPU's M8266 card; the portion of the microcode there used for floating point instructions is the high half of the microcode [[address space]] (which is increased by one bit in the KD11-EA over that in the [[KD11-E CPU|KD11-E]]).
 The FP11-A's connections to the KD11-EA include two [[over the back]] connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card. (This was likely because the [[PDP-11/34]] could be field-upgraded from a [[KD11-E CPU]], which did not support the floating point unit, to a KD11-EA, which did - but its original [[DD11-P backplane]] was retained.)

@@ Line 3: / Line 3: @@
 The '''FP11-A Floating-Point Processor''' is the optional [[hardware]] [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It consists of a single [[DEC card form factor|hex]] board, the '''M8267'''. It supports the full [[PDP-11]] [[FP11 floating point]].
-The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for the CPU is contained on the CPU's M8266 card; the portion used for the FP11-A is the high half.
+The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used in floating point [[instruction]]s, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for floating point instructions for the CPU is contained on the CPU's M8266 card; the portion of the microcode there used for floating point instructions is the high half.
 The FP11-A's connections to the KD11-EA include two [[over the back]] connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card. (This was likely because the [[PDP-11/34]] could be field-upgraded from a [[KD11-E CPU]], which did not support the floating point unit, to a KD11-EA, which did - but its original [[DD11-P backplane]] was retained.)

@@ Line 1: / Line 1: @@
 [[Image:FP11-A.jpg|250px|right|thumb|FP11-A floating point card]]
-The '''FP11-A Floating-Point Processor''' is the optional [[hardware]] [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It supports the full [[PDP-11]] [[FP11 floating point]].
+The '''FP11-A Floating-Point Processor''' is the optional [[hardware]] [[floating point]] unit for the [[PDP-11/34A]] ([[KD11-EA CPU|KD11-EA]] [[Central Processing Unit|CPU]]). It consists of a single [[DEC card form factor|hex]] board, the '''M8267'''. It supports the full [[PDP-11]] [[FP11 floating point]].
-It consists of a single [[DEC card form factor|hex]] board, the M8267. Its connections to the KD11-EA include two [[over the back]] connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card. (This was because the [[PDP-11/34]] could be field-upgraded from a [[KD11-E CPU]], which did not support the floating point unit, to a KD11-EA, which did - but the original [[DD11-P backplane]] was retained.)
+The FP11-A uses a bank of 16 [[Am2901 Four-Bit Microprocessor Slice]] [[integrated circuit|chips]] to perform all its computations; the main CPU is also used, to load and store [[operand]]s in [[main memory]], etc. Both are [[microcode]]d; the microcode width is 48 bits in each. The microcode for the CPU is contained on the CPU's M8266 card; the portion used for the FP11-A is the high half.
-The latter over-the-top connector uses the connectors on the M8266 card which normally hold the maintenance cables to the [[KY11-LB Programmer's Console]]; in systems with a KY11-LB, the cables to the console will now connect to the M8267 card. (This is all necessitated because the FP11-A needs access to signals carried over the maintenance cables.)
+The FP11-A's connections to the KD11-EA include two [[over the back]] connectors; a 20-pin connector to the M8265 card of the KD11-EA, and a 10 pin connector to the M8266 card. (This was likely because the [[PDP-11/34]] could be field-upgraded from a [[KD11-E CPU]], which did not support the floating point unit, to a KD11-EA, which did - but its original [[DD11-P backplane]] was retained.)
 {{semi-stub}}
-{{PDP-11}}
+==External links==
 [[Category: PDP-11 Processors]]