FPJ11 floating point accelerator - Revision history

Jnc: rm bloat

2023-07-02T19:06:51Z

rm bloat

2023-06-03T20:30:32Z

Fixed typo

2022-04-24T11:42:09Z

‎External links: typo

2022-03-16T11:59:56Z

‎External links: +DJC11/FPJ11 Compatibility

2021-11-23T12:31:01Z

link μ"

2021-03-29T00:39:58Z

‎External links: +detailed spec

2020-01-05T20:43:06Z

add image

2018-12-16T21:59:24Z

better cat

2018-12-16T04:11:16Z

+cat

2018-09-09T13:49:34Z

typo

← Older revision		Revision as of 19:06, 2 July 2023
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	* μNote #025, "FPJ11-AA Compatibility with the LSI-11/73 (KDJ11-A)", 28 April 1985		* μNote #025, "FPJ11-AA Compatibility with the LSI-11/73 (KDJ11-A)", 28 April 1985
−
−	~~{{PDP-11}}~~

	[[Category: PDP-11 Processors]]		[[Category: PDP-11 Processors]]

@@ Line 5: / Line 5: @@
 Although the DCJ11 contains a full implementation of the FP11 floating point [[instruction]]s, in [[microcode]], if a J-11 CPU board has an FPJ11 installed, the DCJ111 will automatically notice the presence of the FPJ11, and allow it to handle all floating-point instructions.
-Addition of the FPJ11 improves floating-point peformance by a factor of 5 to 8. The interface between the DCJ11 and the FPJ11 is designed to allow overlap between execution of floating point instructions in the FPJ11, and execution of non-floating point instructions in the DCJ11.
+Addition of the FPJ11 improves floating-point performance by a factor of 5 to 8. The interface between the DCJ11 and the FPJ11 is designed to allow overlap between execution of floating point instructions in the FPJ11, and execution of non-floating point instructions in the DCJ11.
 ==Versions==

@@ Line 15: / Line 15: @@
 * [http://www.bitsavers.org/pdf/dec/internal/Semiconductor_Handbook_V1_1987.pdf DEC Semiconductor Databook, Volume 1], pp. 335-359
 * [http://www.bitsavers.org/pdf/dec/pdp11/1173/fpj11.txt FPJ11 Theory of Operation] μNote #040, 17 September 1985
-* [https://www.subgeniuskitty.com/development/pdp-11/references/fpj11_compat DJC11/FPJ11 Compatibility]
+* [https://www.subgeniuskitty.com/development/pdp-11/references/fpj11_compat DCJ11/FPJ11 Compatibility]
 ==Further reading==

@@ Line 15: / Line 15: @@
 * [http://www.bitsavers.org/pdf/dec/internal/Semiconductor_Handbook_V1_1987.pdf DEC Semiconductor Databook, Volume 1], pp. 335-359
 * [http://www.bitsavers.org/pdf/dec/pdp11/1173/fpj11.txt FPJ11 Theory of Operation] μNote #040, 17 September 1985
 ==Further reading==

@@ Line 14: / Line 14: @@
 * [http://www.bitsavers.org/pdf/dec/internal/Semiconductor_Handbook_V1_1987.pdf DEC Semiconductor Databook, Volume 1], pp. 335-359
 ==Further reading==
-* uNote #025, "FPJ11-AA Compatibility with the LSI-11/73 (KDJ11-A)", 28 April 1985
+* μNote #025, "FPJ11-AA Compatibility with the LSI-11/73 (KDJ11-A)", 28 April 1985
 {{PDP-11}}
 [[Category: PDP-11 Processors]]

← Older revision		Revision as of 00:39, 29 March 2021
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	Two versions of the FPJ11 exist; the FPJ11-AA and the FPJ11-AB. DEC had a number of problems with 'corner cases' (e.g. [[Direct Memory Access\|DMA]] during certain floating point instructions), and had to issue revised versions of the FPJ11 and some J-11 CPU boards (e.g. the [[KDJ11-A CPU\|KDJ11-A]]) to fix them all.		Two versions of the FPJ11 exist; the FPJ11-AA and the FPJ11-AB. DEC had a number of problems with 'corner cases' (e.g. [[Direct Memory Access\|DMA]] during certain floating point instructions), and had to issue revised versions of the FPJ11 and some J-11 CPU boards (e.g. the [[KDJ11-A CPU\|KDJ11-A]]) to fix them all.
		+
		+	==External links==
		+
		+	* [http://www.bitsavers.org/pdf/dec/internal/Semiconductor_Handbook_V1_1987.pdf DEC Semiconductor Databook, Volume 1], pp. 335-359

	==Further reading==		==Further reading==

← Older revision		Revision as of 20:43, 5 January 2020
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−	The '''FPJ11 floating point accelerator''' is an optional [[floating point]] [[co-processor]] for the DCJ11 [[J-11 chip set\|J-11]] [[PDP-11]] chip, which implements the full [[FP11 floating point]] [[instruction set]]. The FPJ11 is a single ~~[[integrated circuit\|~~chip]] which is plugged into a socket on a ~~J-11~~ [[~~Central Processing Unit~~\|CPU]] card.	+	[[Image:FPJ11.jpg\|250px\|thumb\|right\|FPJ11 chip (plugged into [[KDJ11-A CPU]])]]
		+
		+	The '''FPJ11 floating point accelerator''' is an optional [[floating point]] [[co-processor]] for the DCJ11 [[J-11 chip set\|J-11]] [[PDP-11]] [[Central Processing Unit\|CPU]] [[integrated circuit\|chip]], which implements the full [[FP11 floating point]] [[instruction set]]. The FPJ11 is a single chip which is plugged into a [[chip socket\|socket]] on a [[KDJ11 CPUs\|KDJ11 CPU]] card.

	Although the DCJ11 contains a full implementation of the FP11 floating point [[instruction]]s, in [[microcode]], if a J-11 CPU board has an FPJ11 installed, the DCJ111 will automatically notice the presence of the FPJ11, and allow it to handle all floating-point instructions.		Although the DCJ11 contains a full implementation of the FP11 floating point [[instruction]]s, in [[microcode]], if a J-11 CPU board has an FPJ11 installed, the DCJ111 will automatically notice the presence of the FPJ11, and allow it to handle all floating-point instructions.

@@ Line 7: / Line 7: @@
 ==Versions==
-Two versions of the FPJ11 exist; the FPJ11-AA and the FPJ11-AB. DEC had a number of problems with 'corner cases' (e.g. [[Direct Memory Access|DMA]] during certain floating point instructions), and had to issue revised versions of the FPJ11 and some J-11 CPU boards (e.g. the [[KDJ11-A CPU|KDJ11-A]] to fix them all.
+Two versions of the FPJ11 exist; the FPJ11-AA and the FPJ11-AB. DEC had a number of problems with 'corner cases' (e.g. [[Direct Memory Access|DMA]] during certain floating point instructions), and had to issue revised versions of the FPJ11 and some J-11 CPU boards (e.g. the [[KDJ11-A CPU|KDJ11-A]]) to fix them all.
 ==Further reading==