Difference between revisions of "MM11-E and MM1-F core memories"
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− | + | [[Image:H207CoreStack.jpg|300px|right|thumb|H207 core stack]] | |
− | + | The '''MM11-E''' and '''MM11-F core memories''' were [[UNIBUS]] [[main memory]] units; the first UNIBUS memories produced by [[Digital Equipment Corporation|DEC]]. They came out with/for the first [[PDP-11]], the [[PDP-11/20]]. | |
− | The MM11-F was | + | They were very similar - both 4K [[word]] (8K [[byte]]s), and with most of their boards in common. The MM11-F was capable of [[memory interleaving|interleaving]] (although this capability was then made available to the MM11-E as well); it also had a [[parity]] version available, the '''MM11-FP''' (which used a 4Kx18 [[core memory|core plane]], instead of the 4Kx16 used in the MM11-E and MM11-F). |
− | + | The MM11-F was also slightly faster: the MM11-E had an [[access time]] of 500 nsec and a [[cycle time]] of 1.2 μsec; the MM11-F had an access time of 400 nsec and a cycle time of 980 nsec. | |
− | == | + | ==Implementation== |
− | + | Both consisted of a [[DEC card form factor|quad-width]] H207 (non-parity) or H210 (parity) core plane board (the H2xx board consisted of a G617 and a G616 Planar Stack boards), along with a number of dual- and single-width cards (all [[DEC card form factor|extended-length]]), plugged into a custom-wired quad [[system unit]] [[backplane]]. The MM11-F and MM11-FP used the same backplane; only the board set was slightly different. | |
+ | |||
+ | The MM11-E consisted of: | ||
+ | |||
+ | * H207 core plane (quad) | ||
+ | * M729 Control Logic (dual) | ||
+ | * 4 x G102 Sense Inhibit | ||
+ | * G103 Levels and Gates | ||
+ | * G225 Current Generator | ||
+ | * 4 x G226 Decoder and Switch | ||
+ | * M109 Device Select | ||
+ | |||
+ | The MM11-F consisted of: | ||
+ | |||
+ | * H207 or H210 core plane (quad) | ||
+ | * M7290 Control Logic (dual) | ||
+ | * 4 x G102 Sense Inhibit | ||
+ | * G103 Levels and Gates | ||
+ | * G108 Sense-Inhibit (-FP only) | ||
+ | * G225 Current Generator | ||
+ | * 4 x G226 Decoder and Switch | ||
+ | * M1091 Device Select | ||
+ | |||
+ | So the only major difference is the M7290 Control Logic, instead of the M729. | ||
+ | |||
+ | ===Board locations=== | ||
+ | |||
+ | These are the board locations for the MM11-E (as seen from the board side of the backplane): | ||
{| class="wikitable" | {| class="wikitable" | ||
Line 16: | Line 43: | ||
| A || rowspan="2" style="text-align:center;" | UNIBUS<br>Out || Power || || rowspan="2" style="text-align:center;" | UNIBUS<br>In | | A || rowspan="2" style="text-align:center;" | UNIBUS<br>Out || Power || || rowspan="2" style="text-align:center;" | UNIBUS<br>In | ||
|- | |- | ||
− | | B || | + | | B || || M109! |
|- | |- | ||
− | | C || rowspan="4" style="text-align:center;" | H207 | + | | C || rowspan="4" style="text-align:center;" | H207 || G226 || G226 || rowspan="2" style="text-align:center;" | M729 |
|- | |- | ||
| D || G102 || G102 | | D || G102 || G102 | ||
|- | |- | ||
− | | E || G102 || G102 || | + | | E || G102 || G102 || G225 |
|- | |- | ||
| F || G226 || G226 || G103 | | F || G226 || G226 || G103 | ||
|} | |} | ||
− | + | ! = Possibly the later M1091: the M1091 could be used in the MM11-E as well as the MM11-F; it appears that later units of the MM11-E shipped with the M1091. The difference between the M109 and M1091 is the addition of additional [[jumper]]s to allow interleaving. | |
− | + | ||
− | + | These are the board locations for the MM11-F and -FP (as seen from the board side of the backplane): | |
− | + | ||
+ | {| class="wikitable" | ||
+ | ! Connector !! Slot 4 !! Slot 3 !! Slot 2 !! Slot 1 | ||
+ | |- | ||
+ | | A || rowspan="2" style="text-align:center;" | UNIBUS<br>Out || Power || || rowspan="2" style="text-align:center;" | UNIBUS<br>In | ||
+ | |- | ||
+ | | B || G225 || M1091 | ||
+ | |- | ||
+ | | C || rowspan="4" style="text-align:center;" | H207<br>or<br>H210 || G226 || G226 || rowspan="2" style="text-align:center;" | M7290 | ||
+ | |- | ||
+ | | D || G102 || G102 | ||
+ | |- | ||
+ | | E || G102 || G102 || G108@ | ||
+ | |- | ||
+ | | F || G226 || G226 || G103 | ||
+ | |} | ||
+ | |||
+ | @ = MM11-FP only | ||
+ | |||
+ | ==External links== | ||
− | + | * [http://bitsavers.org/pdf/dec/pdp11/memory/MM11-E_CoreMemoryManual.pdf MM11-E Core Memory Manual] (DEC-11-HR3A-D) - includes engineering drawings on pp. 24-41 <!-- also http://shop-pdp.net/~stuff/PDFs/DEC/DEC-11-HR3B-D_MM11-E_Core_Memory_Manual_Mar71.pdf --> | |
+ | * [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/DEC-11-HMFA-D_MM11-F_Manual.pdf MM11-F core memory manual] (DEC-11-HMFA-D) | ||
+ | ** [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/MM11-F_Manual.tar MM11-F core memory manual] - scans of individual pages in a [[tar]] file | ||
+ | * [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/DEC-11-HMFA-D_MM11-F_Drawings.pdf MM11-F core memory engineering drawings] (DEC-11-HMFA-D) | ||
+ | ** [http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/MM11-F_Drawings.tar MM11-F ore memory engineering drawings] - scans of individual pages in a tar file | ||
− | + | [[Category: UNIBUS Memories]] |
Latest revision as of 19:53, 30 July 2023
The MM11-E and MM11-F core memories were UNIBUS main memory units; the first UNIBUS memories produced by DEC. They came out with/for the first PDP-11, the PDP-11/20.
They were very similar - both 4K word (8K bytes), and with most of their boards in common. The MM11-F was capable of interleaving (although this capability was then made available to the MM11-E as well); it also had a parity version available, the MM11-FP (which used a 4Kx18 core plane, instead of the 4Kx16 used in the MM11-E and MM11-F).
The MM11-F was also slightly faster: the MM11-E had an access time of 500 nsec and a cycle time of 1.2 μsec; the MM11-F had an access time of 400 nsec and a cycle time of 980 nsec.
Implementation
Both consisted of a quad-width H207 (non-parity) or H210 (parity) core plane board (the H2xx board consisted of a G617 and a G616 Planar Stack boards), along with a number of dual- and single-width cards (all extended-length), plugged into a custom-wired quad system unit backplane. The MM11-F and MM11-FP used the same backplane; only the board set was slightly different.
The MM11-E consisted of:
- H207 core plane (quad)
- M729 Control Logic (dual)
- 4 x G102 Sense Inhibit
- G103 Levels and Gates
- G225 Current Generator
- 4 x G226 Decoder and Switch
- M109 Device Select
The MM11-F consisted of:
- H207 or H210 core plane (quad)
- M7290 Control Logic (dual)
- 4 x G102 Sense Inhibit
- G103 Levels and Gates
- G108 Sense-Inhibit (-FP only)
- G225 Current Generator
- 4 x G226 Decoder and Switch
- M1091 Device Select
So the only major difference is the M7290 Control Logic, instead of the M729.
Board locations
These are the board locations for the MM11-E (as seen from the board side of the backplane):
Connector | Slot 4 | Slot 3 | Slot 2 | Slot 1 |
---|---|---|---|---|
A | UNIBUS Out |
Power | UNIBUS In | |
B | M109! | |||
C | H207 | G226 | G226 | M729 |
D | G102 | G102 | ||
E | G102 | G102 | G225 | |
F | G226 | G226 | G103 |
! = Possibly the later M1091: the M1091 could be used in the MM11-E as well as the MM11-F; it appears that later units of the MM11-E shipped with the M1091. The difference between the M109 and M1091 is the addition of additional jumpers to allow interleaving.
These are the board locations for the MM11-F and -FP (as seen from the board side of the backplane):
Connector | Slot 4 | Slot 3 | Slot 2 | Slot 1 |
---|---|---|---|---|
A | UNIBUS Out |
Power | UNIBUS In | |
B | G225 | M1091 | ||
C | H207 or H210 |
G226 | G226 | M7290 |
D | G102 | G102 | ||
E | G102 | G102 | G108@ | |
F | G226 | G226 | G103 |
@ = MM11-FP only
External links
- MM11-E Core Memory Manual (DEC-11-HR3A-D) - includes engineering drawings on pp. 24-41
- MM11-F core memory manual (DEC-11-HMFA-D)
- MM11-F core memory manual - scans of individual pages in a tar file
- MM11-F core memory engineering drawings (DEC-11-HMFA-D)
- MM11-F ore memory engineering drawings - scans of individual pages in a tar file