FLIP CHIP - Revision history

Jnc: Tweaks to clarify; more books

2024-03-06T13:50:02Z

Tweaks to clarify; more books

Jnc: /* External links */ 2 more - eng drwngs

2022-11-02T23:00:13Z

‎External links: 2 more - eng drwngs

Jnc: /* External links */ another one at Bitsavers

2022-11-02T22:40:11Z

‎External links: another one at Bitsavers

Jnc: link to relevant chapter in 'Computer Engineering'

2021-12-09T13:40:55Z

link to relevant chapter in 'Computer Engineering'

Jnc: /* External links */ +Module Manual

2021-10-17T21:17:15Z

‎External links: +Module Manual

Jnc: /* External links */ +Flip-Chip Shop

2021-04-01T14:58:15Z

‎External links: +Flip-Chip Shop

Jnc: Bell claims the S were for the -8

2021-03-26T13:11:23Z

Bell claims the S were for the -8

Jnc: +details, +2 F/R

2021-03-26T13:00:49Z

+details, +2 F/R

Jnc: Copyedit; +details of B series, +Further reading

2021-03-25T15:47:31Z

Copyedit; +details of B series, +Further reading

Jnc: +cat

2020-12-02T05:06:15Z

+cat

@@ Line 1: / Line 1: @@
-[[Image:B Series Flip Chip.jpg|thumb|right|300px|A B series FLIP CHIP used in a [[KA10]]]]
+[[Image:B Series Flip Chip.jpg|thumb|right|300px|A B-series FLIP CHIP used in a [[KA10]]; note the etch fingers on one side only]]
-'''FLIP CHIP''' was [[Digital Equipment Corporation|DEC]]'s trade name (a registered trademark for DEC) for a lengthy series of DEC's small [[printed circuit board|cards]] used to build computers, and [[peripheral]]s for them. They were a successor to DEC's earlier [[System Module]]s; they were introduced as a replacement largely as a cost-reduction measure (ironic, since their eventual demise was also due to cost-reduction).
+'''FLIP CHIP''' was [[Digital Equipment Corporation|DEC]]'s trade name (a registered trademark for DEC) for a lengthy series of DEC's small [[printed circuit board|cards]] used to build computers, and [[peripheral]]s for them. They were a successor to DEC's earlier [[System Module]]s. They were introduced as a replacement largely as a cost-reduction measure, using cheaper [[etch]] fingers, as opposed to [[connector]]s (ironic, since their eventual demise was also due to cost-reduction).
 Early FLIP CHIP modules were [[DEC card form factor|single-height]], normal-length modules, approximately 4 inches long and 2.5 inches wide. These had 18 contact fingers on one side of the [[printed circuit board|PCB]] only (the so-called 'solder' side); the contact pads were 'numbered' from the [[DEC Alphabet]]. A FLIP CHIP plugged directly into a 144-pin connector block [[backplane]] with [[wire-wrap]] pins on the back side; automatic Gardner-Denver wire-wrapping equipment could wire the connector blocks to produce larger functional (sub)-systems.
-The earliest FLIP CHIPs, introduced on August 24, 1964, used discrete [[transistor]]s and [[diode]]s; they performed generic, simple [[logic]] functions, similar to an [[integrated circuit]]. FLIP CHIPs incorporating IC technology eventually followed, and the limited number of contact pins eventually became a problem, so that contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
+The earliest FLIP CHIPs, introduced on August 24, 1964, used discrete [[transistor]]s and [[diode]]s; they performed generic, simple [[logic]] functions, similar to an [[integrated circuit]]. FLIP CHIPs incorporating [[integrated circuit|IC]] technology eventually followed, and the limited number of contact pins eventually became a problem, so that contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
-FLIP CHIPs were used in the DEC [[PDP-7]] (referred to in its documentation as the "FLIP CHIP"), [[PDP-8 family|PDP-8]], [[PDP-9]] and [[PDP-10]]. DEC continued to use the name up into the period when [[DEC card form factor|extended-length quad-height]] cards started to appear, e.g. in the [[KA11 CPU]]. However, although these special-purpose cards are labelled 'FLIP CHIP's, they are generally not considered to be 'true' FLIP CHIPS; the name is generally only used to refer to the smaller, general-purpose cards.
+FLIP CHIPs were used in the DEC [[PDP-7]] (referred to in its documentation as the "FLIP CHIP"), [[PDP-8 family|PDP-8]], [[PDP-9]] and [[PDP-10]]. DEC continued to use the name up into the period when [[DEC card form factor|extended-length quad-height]] cards started to appear, e.g. in the [[KA11 CPU]]. However, although these special-purpose cards are labelled 'FLIP CHIP's (and continued to use the initial letter coding), they are generally not considered to be 'true' FLIP CHIPS; the name is generally only used to refer to the smaller, general-purpose cards.
 The small, general-purpose FLIP CHIPs made sense when they were first introduced (in the transistor era), since they allowed designers to operate at a higher conceptual level ([[gate]]s, etc). In the IC era, those became the design elements, and it also became desirable, for cost reasons, to decrease the amount of connectors used in a (sub)-system, so the larger cards became the preferred direction.
@@ Line 21: / Line 21: @@
 [[Image:FlipChips.jpeg|thumb|250px|Flip-chips in different forms and a rainbow of colours, in a [[PDP-8]].]]
-The following FLIP CHIP families ('series', in DEC terminology) were
+The following FLIP CHIP families ('series', in DEC terminology) were introduced over the years. The handles of the various series were colour-coded: the first letter of the identification denoted a colour, which was the colour of the plastic which the handle(s) were formed out of.
 ===A series===
@@ Line 84: / Line 83: @@
 ==Further reading==
-* ''FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, September, 1964
+* ''FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, September, 1964 (C-105)
-* ''Digital FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, February, 1965
+* ''Digital FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, February, 1965 (C-105)
-* ''M Series Modules'', Digital Equipment Corporation, February, 1967
+* ''FLIP CHIP Modules Price List'', Digital Equipment Corporation, Maynard, October, 1965 (C-105)
 ==External links==
 * [http://www.bitsavers.org/pdf/dec/modules/ modules] - FLIP CHIP documentation at [[Bitsavers]]
 ** [http://www.bitsavers.org/pdf/dec/modules/Spare_Module_Handbook_Mar76.pdf Spare Module Handbook (March 1976)] - Lists which FLIP CHIPs are used in many subsystems
 ** [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-15-H2EB-D%20PDP-15%20Module%20Manual.pdf PDP-15 Module Manual] - Contains many M-series modules
 ** [http://www.bitsavers.org/pdf/dec/modules/KI10_moduleSchems_V1_Oct74.pdf Engineering Drawings Manual 1] - B and G series cards
 ** [http://www.bitsavers.org/pdf/dec/modules/KI10_moduleSchems_V2_Oct74.pdf Engineering Drawings Manual 2] - M, R, S and W series cards
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]
 * [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules] - Large database of detailed FLIP CHIP information

@@ Line 95: / Line 95: @@
 ** [http://www.bitsavers.org/pdf/dec/modules/Spare_Module_Handbook_Mar76.pdf Spare Module Handbook (March 1976)] - Lists which FLIP CHIPs are used in many subsystems
 ** [http://www.bitsavers.org/www.computer.museum.uq.edu.au/pdf/DEC-15-H2EB-D%20PDP-15%20Module%20Manual.pdf PDP-15 Module Manual] - Contains many M-series modules
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]
 * [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules] - Large database of detailed FLIP CHIP information

@@ Line 92: / Line 92: @@
 * Richard L. Best, Russell C. Doane and John E. McNamara, [http://gordonbell.azurewebsites.net/Computer_Engineering/00000134.htm Digital Modules, The Basis for Computers], in C. Gordon Bell, J. Craig Mudge, John. E. McNamara, ''Computer Engineering: A DEC View of Hardware Systems Design'', Digital Press, Bedford, 1978
 * [http://research.microsoft.com/en-us/um/people/gbell/Computer_Engineering/00000134.htm In the Beginning] and linked subsequent pages
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]
 * [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules] - Large database of detailed FLIP CHIP information
 * [http://retrocmp.com/flipchipshop Flip-Chip Shop]
 [[Category: Digital Equipment Corporation]]
 [[Category: DEC Boards]]

@@ Line 80: / Line 80: @@
 * [[List of DEC board part numbers]]
 ==Further reading==
 * ''FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, September, 1964
 * ''Digital FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, February, 1965
@@ Line 90: / Line 90: @@
 ==External links==
 * [http://research.microsoft.com/en-us/um/people/gbell/Computer_Engineering/00000134.htm In the Beginning] and linked subsequent pages
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]

@@ Line 93: / Line 93: @@
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]
 * [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules] - Large database of detailed FLIP CHIP information
 * [http://retrocmp.com/flipchipshop Flip-Chip Shop]
 [[Category: Digital Equipment Corporation]]
 [[Category: DEC Boards]]

@@ Line 5: / Line 5: @@
 Early FLIP CHIP modules were [[DEC card form factor|single-height]], normal-length modules, approximately 4 inches long and 2.5 inches wide. These had 18 contact fingers on one side of the [[printed circuit board|PCB]] only (the so-called 'solder' side); the contact pads were 'numbered' from the [[DEC Alphabet]]. A FLIP CHIP plugged directly into a 144-pin connector block [[backplane]] with [[wire-wrap]] pins on the back side; automatic Gardner-Denver wire-wrapping equipment could wire the connector blocks to produce larger functional (sub)-systems.
-The earliest FLIP CHIPs, introduced on August 24, 1964, used discrete [[transistor]]s; they performed generic, simple [[logic]] functions, similar to an [[integrated circuit]]. FLIP CHIPs incorporating IC technology eventually followed, and the limited number of contact pins eventually became a problem, so that contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
+The earliest FLIP CHIPs, introduced on August 24, 1964, used discrete [[transistor]]s and [[diode]]s; they performed generic, simple [[logic]] functions, similar to an [[integrated circuit]]. FLIP CHIPs incorporating IC technology eventually followed, and the limited number of contact pins eventually became a problem, so that contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
 FLIP CHIPs were used in the DEC [[PDP-7]] (referred to in its documentation as the "FLIP CHIP"), [[PDP-8 family|PDP-8]], [[PDP-9]] and [[PDP-10]]. DEC continued to use the name up into the period when [[DEC card form factor|extended-length quad-height]] cards started to appear, e.g. in the [[KA11 CPU]]. However, although these special-purpose cards are labelled 'FLIP CHIP's, they are generally not considered to be 'true' FLIP CHIPS; the name is generally only used to refer to the smaller, general-purpose cards.
@@ Line 62: / Line 62: @@
 ===R series===
-The first FLIP CHIP family; R stands for 'Red'. First developed for the original [[PDP-8]]; they used discrete transistors. Intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits; they were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers, and in a variety of systems.
+The first FLIP CHIP family; R stands for 'Red'. They used discrete transistors; intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits. They were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers.
 * Power supply +10 and -15 volts
@@ Line 71: / Line 71: @@
 === S series ===
-The S series (also with red handles) is identical to the R series, except that its transistors switched faster, and it also used lower resistance [[resistor]]s, allowing more cards to be wired in series, and also operate somewhat faster.
+The S series (also with red handles) is identical to the R series, except that its transistors switched faster, and it also used lower resistance [[resistor]]s, allowing more cards to be wired in series, and also operate somewhat faster. First developed for the original [[PDP-8]].
 ===W series===

@@ Line 29: / Line 29: @@
 The A stands for 'Amber'. The A series were used for analog functions - ADCs, DACs, amplifiers etc.
 ===B series===
@@ Line 37: / Line 39: @@
 * Operational to 10 megahertz
 * Signal level 0 volts, logic 0 and -3 volts, logic 1
 ===G series===
@@ Line 50: / Line 53: @@
 ''See the list of [[List of DEC part numbers#M series|DEC parts]].''
-The M stands for 'Magenta' (a purple colour). When first introduced, they carried the then-new [[transistor-transistor logic|TTL]] chips; they were first used in the [[PDP-8/I]]. Later on, they became quite complex (see [[list of DEC part numbers]]). They replaced the R series.
+The M stands for 'Magenta' (a purple colour). When first introduced, they carried the then-new [[transistor-transistor logic|TTL]] chips; they were first used in the [[PDP-8/I]]. Later on, they became quite complex (see [[list of DEC part numbers]]). They replaced the R and S series.
-* Power supply: 5 V
+* Power supply: +5 V
 * Operate at up to 6 MHz
 ===R series===
-The first FLIP CHIP family, they used discrete transistors; R stands for 'Red'. Intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits; they were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers.
+The first FLIP CHIP family; R stands for 'Red'. First developed for the original [[PDP-8]]; they used discrete transistors. Intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits; they were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers, and in a variety of systems.
 * Power supply +10 and -15 volts
 * Operational to 2 megahertz
 * Signal level 0 volts, logic 0 and -3 volts, logic 1
-* Typical price $20 to $30
+* Typical price $15 to $47 (10/65 price list)
 === S series ===
-The S series (also with red handles), first developed for the original [[PDP-8]], is identical to the R series, except that its transistors switch faster, and it also used lower resistance [[resistor]]s, allowing more cards to be wired in series, and also operate somewhat faster.
+The S series (also with red handles) is identical to the R series, except that its transistors switched faster, and it also used lower resistance [[resistor]]s, allowing more cards to be wired in series, and also operate somewhat faster.
 ===W series===
@@ Line 81: / Line 84: @@
 * C. Gordon Bell, J. Craig Mudge, John. E. McNamara, "''Computer Engineering: A DEC View of Hardware Systems Design''" (Digital Press, Bedford, 1978) - The second half of Chapter 5 covers FLIP CHIP modules
-* ''Digital FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, 1965
+* ''FLIP CHIP Modules'', Digital Equipment Corporation, Maynard, September, 1964
 ==External links==

@@ Line 1: / Line 1: @@
 [[Image:B Series Flip Chip.jpg|thumb|right|300px|A B series FLIP CHIP used in a [[KA10]]]]
-'''FLIP CHIP''' was [[Digital Equipment Corporation|DEC]]'s trade name (a registered trademark for DEC) for a lengthy series of DEC's small [[printed circuit board|cards]] used to build computers, and [[peripheral]]s for them. It was a successor to DEC's earlier [[System Module]]s. The earliest FLIP CHIPs performed generic, simple functions, similar to an [[integrated circuit]].
+'''FLIP CHIP''' was [[Digital Equipment Corporation|DEC]]'s trade name (a registered trademark for DEC) for a lengthy series of DEC's small [[printed circuit board|cards]] used to build computers, and [[peripheral]]s for them. They were a successor to DEC's earlier [[System Module]]s; they were introduced as a replacement largely as a cost-reduction measure (ironic, since their eventual demise was also due to cost-reduction).
-(They should not be confused with the generic technology term [http://en.wikipedia.org/wiki/Flip_chip 'flip chip']; the DEC version, properly spelled with all capital letters, as in the trademark filing, got its name from the fact that some early FLIP CHIPs used flip chips. The latter was a component mounting technique which quite rapidly faded. The name was retained although the majority of FLIP CHIPs never were flip chip-mounted, as it quickly became apparent that the flip chip mounting technique was highly un-reliable.)
+Early FLIP CHIP modules were [[DEC card form factor|single-height]], normal-length modules, approximately 4 inches long and 2.5 inches wide. These had 18 contact fingers on one side of the [[printed circuit board|PCB]] only (the so-called 'solder' side); the contact pads were 'numbered' from the [[DEC Alphabet]]. A FLIP CHIP plugged directly into a 144-pin connector block [[backplane]] with [[wire-wrap]] pins on the back side; automatic Gardner-Denver wire-wrapping equipment could wire the connector blocks to produce larger functional (sub)-systems.
-FLIP CHIPs were used in the DEC [[PDP-7]] (referred to in documentation as the "FLIP CHIP"), [[PDP-8 family|PDP-8]], [[PDP-9]] and [[PDP-10]], beginning on August 24, 1964.
+The earliest FLIP CHIPs, introduced on August 24, 1964, used discrete [[transistor]]s; they performed generic, simple [[logic]] functions, similar to an [[integrated circuit]]. FLIP CHIPs incorporating IC technology eventually followed, and the limited number of contact pins eventually became a problem, so that contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
-They were introduced as a cost-reduction measure; a FLIP CHIP plugged directly into a 144-pin connector block [[backplane]] with [[wire-wrap]] pins on the back side; automatic Gardner-Denver wire-wrapping equipment could wire the connector blocks to produce larger functional modules.
+FLIP CHIPs were used in the DEC [[PDP-7]] (referred to in its documentation as the "FLIP CHIP"), [[PDP-8 family|PDP-8]], [[PDP-9]] and [[PDP-10]]. DEC continued to use the name up into the period when [[DEC card form factor|extended-length quad-height]] cards started to appear, e.g. in the [[KA11 CPU]]. However, although these special-purpose cards are labelled 'FLIP CHIP's, they are generally not considered to be 'true' FLIP CHIPS; the name is generally only used to refer to the smaller, general-purpose cards.
-Early FLIP CHIP modules were [[DEC card form factor|single-height]], normal-length modules, approximately 4 inches long and 2.5 inches wide. These had 18 contact fingers on one side of the [[printed circuit board|PCB]] only (the so-called 'solder' side); the contact pads were 'numbered' from the [[DEC Alphabet]].
+The small, general-purpose FLIP CHIPs made sense when they were first introduced (in the transistor era), since they allowed designers to operate at a higher conceptual level ([[gate]]s, etc). In the IC era, those became the design elements, and it also became desirable, for cost reasons, to decrease the amount of connectors used in a (sub)-system, so the larger cards became the preferred direction.
-The earliest FLIP CHIPs, introduced in 1964, used discrete [[transistor]]s. FLIP CHIPs incorporating [[integrated circuit|IC]] technology soon followed, and the limited number of contact pins eventually became a problem, so that eventually contact fingers were added on the other ('component') side as well, for a total of 36 connectors, 18 on each side.
+==Naming==
-DEC continued to use the name up into the period when [[DEC card form factor|extended-length quad-height]] cards started to appear, e.g. in the [[KA11 CPU]]. However, although these special-purpose cards are labelled 'FLIP CHIP's, they are generally not considered to be 'true' FLIP CHIPS; the name is generally only used to refer to the smaller, general-purpose cards.
+There appeared to be some confusion inside DEC at the time, as various manuals refer to it as "FLIP CHIP", "Flip Chip", "FLIP-CHIP", "Flip-Chip" and "Flip Chip", with trademark and registered trademark symbols.
-== Naming ==
+(They should not be confused with the generic technology term [http://en.wikipedia.org/wiki/Flip_chip 'flip chip']; the DEC version, properly spelled with all capital letters, as in the trademark filing, got its name from the fact that some early FLIP CHIPs used flip chips. The latter was a component mounting technique which quite rapidly faded. The name was retained although the majority of FLIP CHIPs never were flip chip-mounted, as it quickly became apparent that the flip chip mounting technique was highly un-reliable.)
 ==Flip-Chip families==
@@ Line 34: / Line 32: @@
 ===B series===
-The B stands for 'Blue'. First used on the PDP-7, and later in the famous [[KA10]] PDP-10 [[Central Processing Unit|CPU]]; they used silicon transistors, and were used for the main logic in the higher-end CPUs.
+The B stands for 'Blue'; they were effectively the same as the 6000 Series System Modules, but re-packaged into FLIP CHIP form. First used on the PDP-7, and later in the famous [[KA10]] PDP-10 [[Central Processing Unit|CPU]]; they used silicon transistors, and were used for the main logic in the higher-end CPUs.
 ===G series===
-The G stands for 'Green' (the handles are an olive green, not a forest green, though). The G series were specialized modules that are part of a specific larger system (e.g. [[core memory]] drivers).
+The G stands for 'Green' (the handles are an olive green, not a forest green, though). The G series were specialized modules that are part of a specific larger (sub)-system (e.g. [[core memory]] drivers).
 ===K series===
@@ Line 46: / Line 48: @@
 ===M series===
-''See the list of [[List of DEC part numbers#M series|DEC parts]].
+''See the list of [[List of DEC part numbers#M series|DEC parts]].''
-The M stands for 'Magenta' (a purple colour). When first introduced, they carried the then-new [[transistor-transistor logic|TTL]] chips; they were first used in the [[PDP-8/I]]. Later on, they became quite complex (see [[list of DEC part numbers]]). They replaced the R series, which used discrete transistors..
+The M stands for 'Magenta' (a purple colour). When first introduced, they carried the then-new [[transistor-transistor logic|TTL]] chips; they were first used in the [[PDP-8/I]]. Later on, they became quite complex (see [[list of DEC part numbers]]). They replaced the R series.
 * Power supply: 5 V
@@ Line 55: / Line 57: @@
 ===R series===
-The R stands for 'Red'. Intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits; they were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers.
+The first FLIP CHIP family, they used discrete transistors; R stands for 'Red'. Intended to be easy to use, they used [[diode]] gates and diode-[[capacitor]]-diode circuits; they were slower logic than the B series, but cheaper. They were used extensively in the I/O circuitry of computers.
 * Slower logic than B series, cheaper
-* Used in a variety of systems, e.g. [[PDP-8]]
+* Used in a variety of systems, e.g. the original [[PDP-8]]
-* Power supply 10 and -15 volts
+* Power supply +10 and -15 volts
 * Operational to 2 megahertz
 * Signal level 0 volts, logic 0 and -3 volts, logic 1
@@ Line 75: / Line 77: @@
 * [[List of DEC board part numbers]]
 ==External links==
@@ Line 80: / Line 87: @@
 * [http://research.microsoft.com/en-us/um/people/gbell/Computer_Engineering/00000134.htm In the Beginning] and linked subsequent pages
 * [http://www.soemtron.org/pdp7flipchips.html Digital FlipChip Technology]
-* [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules]
+* [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules] - Large database of detailed FLIP CHIP information
 [[Category: Digital Equipment Corporation]]
 [[Category: DEC Boards]]

← Older revision		Revision as of 05:06, 2 December 2020
Line 82:		Line 82:
	* [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules]		* [http://so-much-stuff.com/pdp8/flipchip/flipchip.php FlipChip Modules]

		+	[[Category: Digital Equipment Corporation]]
	[[Category: DEC Boards]]		[[Category: DEC Boards]]