View source for MSV11-L MOS Random-Access Memory

[[Image:MSV11-L.jpg|thumb|250px|right|MSV11-L card]]

The '''MSV11-L''' is a [[QBUS]] [[DEC card form factor|dual]]-height  [[Dynamic RAM|DRAM]] [[main memory]] card ('''M8059'''). It can be configured as either a [[QBUS#Variable address size|Q18]] card, or a Q22 card<!--; it reportedly supports QBUS block mode-->; it supports [[byte]] [[parity]].

The memory is arranged as 2 banks, each 16 data bits (one [[PDP-11]] [[word]]) wide. The MSV11-LK (M8059-Kx) holds 256 KBytes when fully populated with 64K DRAM  [[integrated circuit|chips]], the MSV11-LF (M8059-Fx) is half-populated (the only partially-filled configuration allowed) and holds 128 Kbytes. (The 'x' in the board identifier is a capital letter which identifies the manufacturer of the DRAM chips.)

[[Access time]] is 210-230 nsec for reads, and 90-120 nsec for writes; [[cycle time]]s are 560-590 nsec for reads, 605-635 nsec for writes, and 1140-1170 nsec for read/write (DATIO) cycles. [[Refresh]] time (and conflict delay) is 650-685 nsec.

==Control and Status Register==

Each board has a single [[register]], a Control and Status Register, which can be configured in the range 17772100-17772116 (below). In the register contents, all the bits can be read and written by [[software]]; all other than 'Error Address' are cleared by power up and QBUS INIT. Bits which can only be modified by the [[CPU]] are shown in normal font, and those which can also be set by the board [[hardware]] in ''italics''.
{{16bit-header}}
| ''Parity Error'' || Extended Error Address Enable || colspan=2 | Unused || colspan=7 | ''Error Address'' || colspan=2 | Unused || Write Wrong Parity || Unused || Parity Error Enable 
{{16bitoctal-bitout}}

The 'Error Address' field contents depend on the setting of the 'Extended Error Address Enable' bit: when the bit is '0', the field holds the low address (address bits 17 through 11); when the bit is '1', the field holds the high address (address bits 21 through 18 in register bits 8 through 5  - bits 11-9 of the register will still hold address bits 17-15).

==Configuration==

[[Image:MSV11-LDiag.jpg|250px|thumb|right|M8059 jumper locations]]

The card is configured by [[wire-wrap]] [[jumper]]s between posts; it is possible to set:

* the starting address;
* the size (256KB or 128KB);
* the CSR register; and its address, if so;
* parity enable;
* parity error action;
* enable wrong parity;
* bank disable

Since the manual (below) is not available online, here are the jumper details:

{| class="wikitable"
! Function !! State !! Jumper
|-
| rowspan="2" | Parity || Enable || 9 to 10
|-
| Disable || 11 to 10
|-
| rowspan="2" | Allow clearing 'error enable' || Allow || 20 to 19
|-
| Disallow || 18 to 19
|-
| rowspan="2" | Parity report || BDAL 16 || 3 to 2
|-
| BDAL 16 and 17 || 1 to 2
|-
| rowspan="2" | Write wrong parity || Disable || 8 to 7
|-
| Enable || 6 to 7
|-
| rowspan="2" | CSR || Disable || J to H
|-
| Enable || F to H
|-
| rowspan="2" | I/O page size || 2KW || 29 to 28
|-
| 4KW || 27 to 28
|-
| rowspan="2" | Board size || Half || 32 to 33
|-
| Full || 34 to 33
|-
| rowspan="2" | Which half || Remove lower || 17 to 16
|-
| Normal or Remove upper || 15 to 16
|-
| rowspan="2" | Q18 or Q22 || Q18 || R to T ''out''
|-
| Q22 || R to T in
|}

===Register address===

Jumper from pin 'E' to the listed pins:

{| class="wikitable"
! C !! B !! A !! CSR Address
|-
| Out || Out || Out || 17772100
|-
| Out || Out || In || 17772102
|-
| Out || In || Out || 17772104
|-
| Out || In || In || 17772106
|-
| In || Out || Out || 17772110
|-
| In || Out || In || 17772112
|-
| In || In || Out || 17772114
|-
| In || In || In || 17772116
|}

(Addresses are given in Q22 form; for Q18 operation, delete the high '17'.)

===Starting address (high)===

Jumper from pin 'K' to the listed pins:

{| class="wikitable"
! P || N || M || L || Staring Address
|-
| Out || Out || Out || Out || 00000000
|-
| Out || Out || Out || In || 01000000
|-
| Out || Out || In || Out || 02000000
|-
| Out || Out || In|| In || 03000000
|-
| Out || In || Out || Out || 04000000 (1 MB)
|-
| Out || In || Out || In || 05000000
|-
| Out || In || In || Out || 06000000
|-
| Out || In || In || In || 07000000
|-
| In || Out || Out || Out || 10000000 (2 MB)
|-
| In || Out || Out || In || 11000000
|-
| In || Out || In || Out || 12000000
|-
| In || Out || In || In || 13000000
|-
| In || In || Out || Out || 14000000 (3 MB)
|-
| In || In || Out || In || 15000000
|-
| In || In || In || Out || 16000000
|-
| In || In || In || In || 17000000
|}

===Starting address (low)===

Jumper from pin 'U' to the listed pins:

{| class="wikitable"
! Z || Y || X || W || V || Staring Address
|-
| Out || Out || Out || Out || Out || 000000
|-
| Out || Out || Out || Out || In || 020000
|-
| Out || Out || Out || In || Out || 040000
|-
| Out || Out || Out || In || In || 060000
|-
| Out || Out || In || Out || Out || 100000
|-
| Out || Out || In || Out || In || 120000
|-
| Out || Out || In || In || Out || 140000
|-
| Out || Out || In || In || In || 160000
|-
| Out || In || Out || Out || Out || 200000
|-
| Out || In || Out || Out || In || 220000
|-
| Out || In || Out || In || Out || 240000
|-
| Out || In || Out || In || In || 260000
|-
| Out || In || In || Out || Out || 300000
|-
| Out || In || In || Out || In || 320000
|-
| Out || In || In || In || Out || 340000
|-
| Out || In || In || In || In || 360000
|-
| In || Out || Out || Out || Out || 400000
|-
| In || Out || Out || Out || In || 420000
|-
| In || Out || Out || In || Out || 440000
|-
| In || Out || Out || In || In || 460000
|-
| In || Out || In || Out || Out || 500000
|-
| In || Out || In || Out || In || 520000
|-
| In || Out || In || In || Out || 540000
|-
| In || Out || In || In || In || 560000
|-
| In || In || Out || Out || Out || 600000
|-
| In || In || Out || Out || In || 620000
|-
| In || In || Out || In || Out || 640000
|-
| In || In || Out || In || In || 660000
|-
| In || In || In || Out || Out || 700000
|-
| In || In || In || Out || In || 720000
|-
| In || In || In || In || Out || 740000
|-
| In || In || In || In || In || 760000
|}

<!-- ==Technical information==
-->
==Further reading==

* ''MSV11-L User Guide'', EK-MSV0L-UG (not available online)

==External links==

* ''MSV11-L Field Maintenance Printset'' (MP-01238)
** [https://www.mainecoon.com/classiccmp/MSV11-L/MSV11-L%20FMPS%20MP01238%20(M8059)%20part-1.tif part 1]
** [https://www.mainecoon.com/classiccmp/MSV11-L/MSV11-L%20FMPS%20MP01238%20(M8059)%20part-2.tif part 2]

[[Category: QBUS Memories]]