MK11 memory system - Revision history

Jnc: /* External links */ Manx mirror of HCPS is gone

2026-10-11T08:29:31Z

External links: Manx mirror of HCPS is gone

← Older revision		Revision as of 08:29, 11 October 2026
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	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]
	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)
	* [https://~~manx-docs~~.~~org~~/~~collections~~/hcps/m8750.pdf M8750 Field Maintenance Print Set] (MP01398) - very faint scans		* [https://vt100.net/mirror/hcps/m8750.pdf M8750 Field Maintenance Print Set] (MP01398) - very faint scans
	* [http://www.bitsavers.org/pdf/dec/vax/730/MP01270_11-730_Engineering_Drawings_198204.pdf 11/730-Z Field Maintenance Print Set (MP01270)] - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)		* [http://www.bitsavers.org/pdf/dec/vax/730/MP01270_11-730_Engineering_Drawings_198204.pdf 11/730-Z Field Maintenance Print Set (MP01270)] - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)
	* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]		* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]

	[[Category: PDP-11 Memories]]		[[Category: PDP-11 Memories]]

Jnc: /* External links */ Bitsavers has reorganized a bit

2026-10-03T01:36:28Z

External links: Bitsavers has reorganized a bit

← Older revision		Revision as of 01:36, 3 October 2026
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	==External links==		==External links==

	* [http://www.bitsavers.org/pdf/dec/pdp11/memory/EK-0MK11-TM-001_MK11mem.pdf MK11 MOS memory technical manual] (EK-0MK11-TM-001)		* [http://www.bitsavers.org/pdf/dec/pdp11/memory/MK11/EK-0MK11-TM-001_MK11mem.pdf MK11 MOS memory technical manual] (EK-0MK11-TM-001)
	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part1.pdf MK11-B Field Maintenance Print Set (part 1)]		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part1.pdf MK11-B Field Maintenance Print Set (part 1)]
	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]

Jnc: rm dup cat

2024-02-06T01:23:04Z

rm dup cat

← Older revision		Revision as of 01:23, 6 February 2024
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	[[Category: PDP-11 Memories]]		[[Category: PDP-11 Memories]]
	~~[[Category: DEC Memories]]~~

Jnc: Better category

2024-02-06T01:19:04Z

Better category

← Older revision		Revision as of 01:19, 6 February 2024
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	* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]		* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]

	[[Category: PDP-11 ~~Peripherals~~]]		[[Category: PDP-11 Memories]]
	[[Category: DEC Memories]]		[[Category: DEC Memories]]

Jnc: +New Category

2024-02-05T23:56:32Z

+New Category

← Older revision		Revision as of 23:56, 5 February 2024
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	* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]		* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]

	[[Category: PDP-~~11s~~]]		[[Category: PDP-11 Peripherals]]
	[[Category: DEC Memories]]		[[Category: DEC Memories]]

Jnc: interleaving cleanup

2023-07-30T17:53:24Z

interleaving cleanup

← Older revision		Revision as of 17:53, 30 July 2023
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	A maximum of eight MK11 systems could be installed on a single machine, for a maximum of slightly less than 4MB (with 64KB modules, eight MK11 systems would be needed to reach this; with 265KB modules, only two).		A maximum of eight MK11 systems could be installed on a single machine, for a maximum of slightly less than 4MB (with 64KB modules, eight MK11 systems would be needed to reach this; with 265KB modules, only two).

	A separate 'Box Controller' panel module mounted in the rack controlled whether the MK11 unit was in use, what its starting [[address]] was, 'external' [[interleaving]], etc. (The MK11 contains two controllers internally, and when an MK11 contains a symmetrical set of memory array modules, 'internal' interleaving between the two of them is automagically enabled.)		A separate 'Box Controller' panel module mounted in the rack controlled whether the MK11 unit was in use, what its starting [[address]] was, 'external' [[memory interleaving\|interleaving]], etc. (The MK11 contains two controllers internally, and when an MK11 contains a symmetrical set of memory array modules, 'internal' interleaving between the two of them is automagically enabled.)

	==Implementation==		==Implementation==

Jnc: Add card M-numbers to captions

2023-05-16T14:12:24Z

Add card M-numbers to captions

← Older revision		Revision as of 14:12, 16 May 2023
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	An MK11-B could be upgraded to an MK11-B-2 by swapping in an M8164 data buffer board for the M8159, and swapping in, or adding, pairs of 256KB memory array board sets.		An MK11-B could be upgraded to an MK11-B-2 by swapping in an M8164 data buffer board for the M8159, and swapping in, or adding, pairs of 256KB memory array board sets.

	[[Image:256KBMemoryArray.jpg\|thumb\|200px\|right\|256KB module]]		[[Image:256KBMemoryArray.jpg\|thumb\|200px\|right\|M8728 256KB module]]

	There were two generations of memory array modules for the MK11; the first is the MS11-K (link above; 32KB and 64KB, depending on the number of DRAM [[integrated circuit\|chips]] used); the second is the M8728 (name currently unknown), which used 156 16Kx1 DRAM chips to provide a 256KB memory array module.		There were two generations of memory array modules for the MK11; the first is the MS11-K (link above; 32KB and 64KB, depending on the number of DRAM [[integrated circuit\|chips]] used); the second is the M8728 (name currently unknown), which used 156 16Kx1 DRAM chips to provide a 256KB memory array module.
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	===Non-standard upgrades===		===Non-standard upgrades===

	[[Image:1MBMemoryArray.jpg\|thumb\|200px\|left\|1MB module]]		[[Image:1MBMemoryArray.jpg\|thumb\|200px\|left\|M8750 1MB module]]

	A later board, the M8750, used the same [[Printed circuit board\|PCB]] as the M8728, but 64Kx1 DRAM chips - the board had [[jumper]]s to allow the use of either size chip - to provide a 1MB memory array module (used in the [[VAX-11/730]] and [[VAX-11/750]]).		A later board, the M8750, used the same [[Printed circuit board\|PCB]] as the M8728, but 64Kx1 DRAM chips - the board had [[jumper]]s to allow the use of either size chip - to provide a 1MB memory array module (used in the [[VAX-11/730]] and [[VAX-11/750]]).

Jnc: /* External links */ +M8750 FMPS

2022-06-04T03:55:29Z

External links: +M8750 FMPS

← Older revision		Revision as of 03:55, 4 June 2022
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	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]
	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)
			* [https://manx-docs.org/collections/hcps/m8750.pdf M8750 Field Maintenance Print Set] (MP01398) - very faint scans
	* [http://www.bitsavers.org/pdf/dec/vax/730/MP01270_11-730_Engineering_Drawings_198204.pdf 11/730-Z Field Maintenance Print Set (MP01270)] - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)		* [http://www.bitsavers.org/pdf/dec/vax/730/MP01270_11-730_Engineering_Drawings_198204.pdf 11/730-Z Field Maintenance Print Set (MP01270)] - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)
	* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]		* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]

	~~{{PDP-11}}~~

	[[Category: PDP-11s]]		[[Category: PDP-11s]]
	[[Category: DEC Memories]]		[[Category: DEC Memories]]

Jnc: /* External links */ +M8750 eng drws

2022-06-02T21:27:51Z

External links: +M8750 eng drws

← Older revision		Revision as of 21:27, 2 June 2022
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	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MK11-B_Field_Maintenance_Print_Set_Oct77_part2.pdf MK11-B Field Maintenance Print Set (part 2)]
	* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)		* [http://www.bitsavers.org/pdf/dec/pdp11/1170/MP00523_MK11-B_revB_Field_Maintenance_Print_Set_Mar1978.pdf MK11-B Field Maintenance Print Set] (MP00523)
			* [http://www.bitsavers.org/pdf/dec/vax/730/MP01270_11-730_Engineering_Drawings_198204.pdf 11/730-Z Field Maintenance Print Set (MP01270)] - the M8750 is covered in MS730-C Field Maintenance Print Set (MP01366) (pp. 292-12 of the PDF)
	* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]		* [https://marc.info/?l=classiccmp&m=142608921824435 VAX-11/750 memory in 11/70]

Jnc: +imgs M8158/M8159 Address/Data Buffer cards

2022-03-28T12:40:38Z

+imgs M8158/M8159 Address/Data Buffer cards

← Older revision		Revision as of 12:40, 28 March 2022
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	==Implementation==		==Implementation==

			[[Image:M8158MK11ABuf.jpg\|thumb\|250px\|left\|M8158 Address Buffer card (note memory bus [[terminator]]s)]]

	An MK11 system contained six [[DEC card form factor\|hex]] control modules (of four different types), and then a group of up to eight pairs of hex memory array modules; they were all plugged into a large custom 24-slot [[backplane]] ([[DEC part number]] 70-14226-0), all housed in a [[BA11-K mounting box]].		An MK11 system contained six [[DEC card form factor\|hex]] control modules (of four different types), and then a group of up to eight pairs of hex memory array modules; they were all plugged into a large custom 24-slot [[backplane]] ([[DEC part number]] 70-14226-0), all housed in a [[BA11-K mounting box]].

	The control modules included a pair of memory bus interface boards (an M8158 address buffer board, and either an M8159 or M8164 data buffer board; the M8159 could only be used with 64KB memory modules, whereas the M8164 could be used with either those or 256KB modules); and two pairs of control boards (an M8160 Control A module, and an M8161 Control B module), one set for each controller of the MK11 system. The Control A modules generated timing signals, did module addressing, checked the configuration (below), and did memory refresh. The Control B modules interfaced to the memory modules, and computed and checked the ECC.		The control modules included a pair of memory bus interface boards (an M8158 address buffer board, and either an M8159 or M8164 data buffer board; the M8159 could only be used with 64KB memory modules, whereas the M8164 could be used with either those or 256KB modules); and two pairs of control boards (an M8160 Control A module, and an M8161 Control B module), one set for each controller of the MK11 system. The Control A modules generated timing signals, did module addressing, checked the configuration (below), and did memory refresh. The Control B modules interfaced to the memory modules, and computed and checked the ECC.

			[[Image:M8159MK11DBuf.jpg\|thumb\|250px\|right\|M8159 Data Buffer card (also with memory bus terminators)]]

	The memory array modules were placed in the backplane from the inner slots (next to the buffer and control boards) toward the outer; the buffer and control boards went in the center slots. When an MK11 backplane contained a mix of different size board pairs, the smallest ones had to be in the lower locations (i.e. close to the buffer and control boards). If there were an even number of memory array boards installed, and the sizes were matched on each side, the MK11 automatically enabled interleaving.		The memory array modules were placed in the backplane from the inner slots (next to the buffer and control boards) toward the outer; the buffer and control boards went in the center slots. When an MK11 backplane contained a mix of different size board pairs, the smallest ones had to be in the lower locations (i.e. close to the buffer and control boards). If there were an even number of memory array boards installed, and the sizes were matched on each side, the MK11 automatically enabled interleaving.
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	===Cabling===		===Cabling===

	The Box Controller panel (DEC part number 70-14274-0) was connected to the MK11 via two cables: a BC08R-10 [[flat cable]] (which plugs into [[Berg connector]] header J5 on the ~~M8159~~ data buffer board), and a power control cable (DEC part number 70-14311-9F).		The Box Controller panel (DEC part number 70-14274-0) was connected to the MK11 via two cables: a BC08R-10 [[flat cable]] (which plugs into [[Berg connector]] header J5 on the data buffer board), and a power control cable (DEC part number 70-14311-9F).

	==Upgrades==		==Upgrades==