FP11-A Floating-Point Processor - Revision history

Jnc: Better cat

2022-10-13T00:17:02Z

Better cat

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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]]

Jnc: Details on expanded microcode

2022-02-13T12:04:24Z

Details on expanded microcode

← Older revision		Revision as of 12:04, 13 February 2022
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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 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.)		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.)

			==Implementation==

			The microcode to control the [[logic]] elements on the FP11-A is stored in [[read-only memory#PROM\|PROM]] on the FP11-A; the microcode for floating point instructions in 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. The microcode PROM chips in the KD11-EA are thus twice the size (1024.x4) of those in the KD11-E (512.x4).

			Most bits (0 to 8) of the micro-[[Program Counter\|PC]] (next micro-instruction) are generated in the KD11-EA, and sent to the FP11-A; the new high bit (9) is however generated in the FP11-A, and sent back to the KD11-EA. One of the Instruction Decoder PROMs in the KD11-EA is twice the size of that in the KD11-E; the extra address input to it is a [[signal]] which indicates that an FP11-A is installed. Thus, it is as if that chip contains two separate instruction decoding tables: one for use when no FP11-A in installed (and thus, floating point instructions will be designated as 'illegal'), and another one when it is.

			Note that since bit 9 of the micro-PC is not generated in the KD11-EA (its microword does not contain a bit for it in the 'next micro-instruction' field), that Instruction Decoder cannot cause the microcode to branch to the floating point microcode. Instead (as described in section 6.4.1 of the FP11-A Technical Manual), when a new instruction is fetched, circuitry on the FP11-A checks to see if it is a floating point instruction, and if so, forces a microcode branch to 01400 (in the floating point microcode).

			The PROMS in the FP11-A are only 512.x4; there are thus no FP11-A microcode words associated with the bottom half of the microcode address space (used for 'normal' instructions). As described in section 6.4.8 of the FP11-A Technical Manual, when the microcode in the bottom half is being executed, a signal disables the FP11-A microcode (so the FP11-A 'idles', and doesn't do anything).

	==Installation==		==Installation==

Jnc: clarify "high half"

2022-02-09T11:13:11Z

clarify "high half"

← Older revision		Revision as of 11:13, 9 February 2022
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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 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.)		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.)

Jnc: clarify

2022-01-12T20:28:10Z

clarify

← Older revision		Revision as of 20:28, 12 January 2022
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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 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.)		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.)

Jnc: Implementation details; + manuals, FMPS

2022-01-12T15:01:23Z

Implementation details; + manuals, FMPS

← Older revision		Revision as of 15:01, 12 January 2022
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	[[Image:FP11-A.jpg\|250px\|right\|thumb\|FP11-A floating point card]]		[[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.)

			==Installation==

			This is mostly covered [[KD11-EA CPU#FP11-A/KK11-A installation\|here]]. 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.)

			For hardware debugging/repair, when the M8267 card is normally placed on a hex [[extender card]] to allow physical access to internal signals, a special W9042 Extender Board exists, to be used in place of the usual over the back connector, when so doing.

	{{semi-stub}}		{{semi-stub}}

	~~{{PDP~~-~~11}}~~		==External links==

			* [http://www.bitsavers.org/pdf/dec/pdp11/1134/EK-FP11A-UG-001.pdf FP11-A floating-point processor user's guide] (EK-FP11A-UG-001)
			* [http://www.bitsavers.org/pdf/dec/pdp11/1134/EK-FP11A-TM-002.pdf FP11-A floating-point processor technical manual] (EK-FP11A-TM-002)
			* [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 Processors]]

Jnc: +image

2020-06-14T02:04:02Z

+image

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			[[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 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~~\|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.		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 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 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.)

Jnc: +cat, +links

2018-12-19T23:05:39Z

+cat, +links

← Older revision		Revision as of 23:05, 19 December 2018
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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 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 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.		It consists of a single [[DEC card form factor\|hex]] board, the M8267. Its connections to the KD11-EA include two [[over the back\|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 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 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.)
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	{{PDP-11}}		{{PDP-11}}

			[[Category: PDP-11 Processors]]

Jnc: Proper cat

2018-10-18T19:52:23Z

Proper cat

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	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 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.)

	{{stub}}		{{semi-stub}}

	{{PDP-11}}		{{PDP-11}}

Jnc: clarify

2017-12-06T16:34:26Z

clarify

← Older revision		Revision as of 16:34, 6 December 2017
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	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.		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.)		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.)

	{{stub}}		{{stub}}

	{{PDP-11}}		{{PDP-11}}

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}}