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• MS11-M MOS memory
  ...card; it can theoretically be configured as either [[UNIBUS]] memory, or [[Extended UNIBUS]]. In actuality, the MS11-M uses power [[voltage]]s of +12V/-12V, un ...ia negation of the ACLO UNIBUS signal) for up to 451 msec while the entire memory is cleared, to prevent spurious ECC errors. For [[diagnostic]] purposes, th
  3 KB (473 words) - 20:02, 30 July 2023
• Extended UNIBUS memories
  '''Extended UNIBUS memory''' [[main memory]] cards for the [[Extended UNIBUS]] were available from [[Digital Equipment Corporation|DEC]] and from All DEC EUB memory used [[Dynamic RAM|DRAM]]s, and some used [[Error-correcting code|ECC]] to
  694 bytes (101 words) - 15:54, 6 February 2024
• Protected mode
  ...rchitecture]] of the later chips, including hardware support for [[virtual memory]]. ...that architecture allows them to switch into protected mode, where all the extended features of the later architecture are available.
  1 KB (185 words) - 16:06, 15 March 2021
• Real mode
  ...chitecture]]s of the later chips, including hardware support for [[virtual memory]], is apparently (to the program) ''not'' present. ...architecture allows them to switch into [[protected mode]], where all the extended features of the later architectures are available. Real mode in the later x
  3 KB (536 words) - 16:57, 19 January 2023
• LSI-11 chip set
  ...ta path]] chip, a control chip, and two or three [[microcode]] [[Read-only memory|ROMs]] (each holding 512 microwords, which are 22 bits wide). (The microcod ...ction Set|EIS]]/[[FIS floating point|FIS]] [[instruction]]s; the [[KEV11-B Extended Instruction Set|KEV11-B]] provides EIS without FIS; the [[KEV11-C Commercia
  5 KB (773 words) - 22:42, 20 December 2023
• BA11-E Mounting Box
  ...20]]). In that role, it was used to hold extra [[core memory|core]] [[main memory]] systems (each in their own custom system unit) and other devices, and had ...form factor|hex]] cards, only quads, plus a single [[DEC card form factor|extended length]] card.
  2 KB (397 words) - 03:13, 11 July 2023
• Interlan NI1010A/NI2010A Ethernet Communications Controller
  ...ect Memory Access|DMA]] to transfer data to and from [[buffer]]s in [[main memory]]. They have an on-board [[First-In First-Out buffer|FIFO]] buffer which ca ...the NI1010A, at the cost of not being able to use more than 256KB of main memory.
  6 KB (797 words) - 21:11, 17 August 2022
• KD11-D CPU
  ...[[microcode|micro-programmed]] processor (making heavy use of [[Read-only memory#PROM|PROMs]]). It was contained on single [[DEC card form factor|hex]] [[pr ...[memory management]] of any kind, or hardware [[floating point]], [[PDP-11 Extended Instruction Set|EIS]] [[instruction]]s, or the various instructions added t
  2 KB (385 words) - 22:37, 31 March 2022
• KM11-A Maintenance Set
  ** [[KT11-D Memory Management|KT11-D]], [[KE11-E Extended Instruction Set|KE11-E]]/[[KE11-F Floating Instruction Set|KE11-F]] There is also reportedly an overlay for the [[KE11-A Extended Arithmetic Element‎]], but although several KE11-A documents refer to it,
  3 KB (421 words) - 18:49, 27 February 2023
• KD11-K CPU
  ...nt|subset PDP-11 memory management]], and used a [[UNIBUS]] for its [[main memory]] access (although a built-in [[cache]] was standard). ...ailable were either a User Control Store (1KW of read-write microcode), an Extended Control Store ([[ROM]] microcode), or a Diagnostic Control Store.
  4 KB (536 words) - 12:34, 11 October 2022
• VGA
  ...rdware can be expected to implement. It was officially followed by IBM's [[Extended Graphics Array]] (XGA) standard, but was effectively superseded by numerous *256 [[kilobyte|KB]] Video [[Random-access memory|RAM]] (The very first cards could be ordered with 64 KB or 128 KB
  11 KB (1,681 words) - 12:41, 27 February 2024
• Microsoft BASIC
  ...The entry-level version of the 5150 came with just 16 KB of random-access memory (RAM), which was sufficient to run Cassette BASIC. However, Cassette BASIC ...purpose of Disk BASIC was as a "lite" version for IBM PCs with only 48K of memory: BASIC.COM would then have about 23K free for user code, whereas BASICA wou
  9 KB (1,473 words) - 03:37, 16 January 2024
• QBUS CPU ODT
  ...line]] as a operating console. There are commands to read and write [[main memory]], [[register]]s in the CPU, start the CPU, etc. The [[LSI-11 CPUs]], using the [[LSI-11 chip set]], have an extended ODT [[syntax]] with extra commands:
  2 KB (327 words) - 05:59, 22 October 2021
• LSI-11 CPUs
  ...ing on the operand modes, PDP-11 instructions could add up to 6 additional memory cycles per instruction, above the 1 needed to [[fetch]] the basic instructi ...that ODT will not function correctly in the LSI-11s unless there is [[main memory]] on the [[QBUS]] (at location 0). The reason for this restriction is unkno
  3 KB (453 words) - 16:35, 6 April 2024
• MSV11-Q QBUS memory
  ...64Kx1 DRAM [[integrated circuit|chips]], later ones use 256Kx1 DRAMs. The memory is arranged as 8 banks, each 16 data bits (1 [[PDP-11]] [[word]]) wide, wit | ''Parity Error'' || Extended Error Address Enable || colspan=2 | Reserved || colspan=7 | ''Error Address
  6 KB (898 words) - 21:25, 16 March 2022
• KT24 UNIBUS map option
  ...the [[PDP-11/24]] which provided a full path between its [[UNIBUS]] and [[Extended UNIBUS]] (EUB) via a [[UNIBUS map]]. It also provided a number of other fac ...ocks of UNIBUS [[address space]] to any location within the 4 Mbyte [[main memory]] [[address space]]. A pair of [[jumper]] sets could limit the range of UNI
  2 KB (310 words) - 16:02, 6 February 2024
• DRV11-B Direct Memory Access Interface
  ...of 16-[[bit]] parallel ports, one input, and one output; it uses [[Direct Memory Access|DMA]] to transfer data. * NEX - Nonexistent Memory; also write-to-zero
  3 KB (380 words) - 03:54, 10 June 2020
• MSV11-R memory module
  ...t [[QBUS]]/[[Private Memory Interconnect|PMI]] [[Dynamic RAM|DRAM]] [[main memory]] card. ...yte when fully populated with 256K DRAM [[integrated circuit|chips]]. The memory is arranged as 2 banks, each 16 data bits (1 [[PDP-11]] [[word]]) wide, wit
  6 KB (962 words) - 15:51, 24 December 2021
• MSV11-M QBUS memory
  ...[[DEC card form factor|dual]]-height [[QBUS]] [[Dynamic RAM|DRAM]] [[main memory]] card. The MSV11-MB (M7506-BA) holds 1 MByte when fully populated with 256 The memory is arranged as 2 banks, each 16 data bits (1 [[PDP-11]] [[word]]) wide, wit
  6 KB (988 words) - 21:25, 2 July 2023
• MSV11-L MOS Random-Access Memory
  ...[[QBUS]] [[DEC card form factor|dual]]-height [[Dynamic RAM|DRAM]] [[main memory]] card ('''M8059'''). It can be configured as either a [[QBUS#Variable addr The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide. T
  6 KB (926 words) - 14:10, 22 September 2022

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