UDA50 Disk Controller - Revision history

Jnc: Not a disk drive

2023-08-31T08:55:02Z

Not a disk drive

Jnc: /* External Links */ +The RA60, RA80 and RA81 Disk Drives and The Digital Storage Architecture

2023-08-18T20:27:51Z

‎External Links: +The RA60, RA80 and RA81 Disk Drives and The Digital Storage Architecture

Jnc: /* Microprocessor Module */ +link

2022-11-07T14:20:58Z

‎Microprocessor Module: +link

Jnc: /* External Links */ Manual + FMPS

2022-11-06T01:48:44Z

‎External Links: Manual + FMPS

Jnc: adda few more links

2022-09-02T11:42:48Z

adda few more links

Jnc: Add board images, some links

2022-08-30T17:12:08Z

Add board images, some links

Show changes

Jnc: Jnc moved page UDA50 to UDA50 Disk Controller: formal DEC name

2022-08-27T16:15:42Z

Jnc moved page UDA50 to UDA50 Disk Controller: formal DEC name

Vaxorcist: Version details & External links added

2022-08-27T08:11:11Z

Version details & External links added

Vaxorcist: UDA50 details

2022-08-27T07:46:11Z

UDA50 details

Jnc: Better cat

2021-08-22T08:18:54Z

Better cat

← Older revision		Revision as of 08:55, 31 August 2023
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	[[Category: UNIBUS Storage Controllers]]		[[Category: UNIBUS Storage Controllers]]
−	[[Category: ~~MSCP Disk Drives~~]]	+	[[Category: SDI Controllers]]

@@ Line 62: / Line 62: @@
 ** [http://www.bitsavers.org/pdf/dec/disc/uda50/EK-UDA50-UG-003_usersGuide.pdf UDA50 User Guide] (EK-UDA50-UG-003)
 ** [http://www.bitsavers.org/pdf/dec/disc/uda50/MP01331_UDA50_EngrDrws.pdf UDA50 Field Maintenance Print Set] (MP-01331)
-* [https://www.pdp-11.nl/peripherals/disk/ra81-info.html#unibus%20ifcs UDA50 hard disk drive controller] - a Collector's UDA50 Summary
+* [http://bitsavers.org/pdf/dec/disc/brochure/RA60_RA80_And_RA81_Disk_Drives_Brochure_Aug82.pdf The RA60, RA80 and RA81 Disk Drives and The Digital Storage Architecture] - brochure that covers the UDA50 also
 [[Category: UNIBUS Storage Controllers]]

@@ Line 39: / Line 39: @@
 The UDA50 microprocessor module (M7161/M7485) contains two microsequencers which share an [[arithmetic logic unit|arithmetic and logic unit (ALU)]]. The two microprocessors execute independent micro programs from [[read-only memory|read only memory (ROM)]] also located on the module. One of the microprocessors, the UNIBUS microprocessor, handles transactions with the host computer and sets overall policy for UDA50 operation. The other, the drive microprocessor, handles interaction with the disk drives including error recovery.
-The microprocessor module performs all UDA50 interaction with the UNIBUS. It contains the two [[register]]s by which the UDA50 communicates with its host, and a switch pack for setting their addresses. It also contains a mount for a standard UNIBUS interrupt priority plug. Host software defines the interrupt vector address during UDA50 initialization, so no hardware means of setting it is required.
+The microprocessor module performs all UDA50 interaction with the UNIBUS. It contains the two [[register]]s by which the UDA50 communicates with its host, and a switch pack for setting their addresses. It also contains a mount for a standard [[UNIBUS priority plug]]. Host software defines the interrupt vector address during UDA50 initialization, so no hardware means of setting it is required.
 The microprocessor module holds the standard UNIBUS data transfer chips, which perform cycle level transactions on the UNIBUS. To avoid interference with UNIBUS devices having limited buffering, the module contains bus request delay jumpers, which maybe set to force a delay of 0, 6.2, or 10 microseconds between UDA50 UNIBUS accesses.

@@ Line 60: / Line 60: @@
 * [http://www.bitsavers.org/pdf/dec/disc/uda50/ UDA50] - documentation at [[Bitsavers]]
 * [https://www.pdp-11.nl/peripherals/disk/ra81-info.html#unibus%20ifcs UDA50 hard disk drive controller] - a Collector's UDA50 Summary
 [[Category: UNIBUS Storage Controllers]]

@@ Line 1: / Line 1: @@
 [[File:UDA50-M7485.jpg|300px|thumb|right|UDA50 (second version) M7485 microprocessor card]]
-The '''UDA50 Disk Controller''' is an intelligent controller which connects up to four [[Standard Disk Interconnect#SDI Family of DSA Products|SDI disks]] to a [[UNIBUS]].
+The '''UDA50 Disk Controller''' is an intelligent [[device controller]] which connects up to four [[Standard Disk Interconnect#SDI Family of DSA Products|SDI disks]] to a [[UNIBUS]].
 It uses a radial bus configuration instead of the conventional daisy-chain (serial) method; thus, there is a separate I/O cable going to each disk drive.
@@ Line 19: / Line 19: @@
 * Increased RAM size on the M7486 module from 4K to 16K.
-* Minor hardware modification to make buffering easier.
+* Minor hardware modification to make [[buffer]]ing easier.
 * Etched-in capability to use larger PROMS.
-* Selectable jumpers for UNIBUS delays for various systems.
+* Selectable [[jumper]]s for UNIBUS delays for various systems.
 '''''CAUTION:'''''
-The new UDA50 M7485 and M7486 modules are not upward or downward compatible with the old UDA50 M7161 and M7162 modules. Under no circumstances should a new UDA50 module be used to replace a failing old UDA50 module, unless both modules are replaced as a set.
+The new UDA50 M7485 and M7486 modules are not upward or downward [[plug compatible|compatible]] with the old UDA50 M7161 and M7162 modules. Under no circumstances should a new UDA50 module be used to replace a failing old UDA50 module, unless both modules are replaced as a set.
 == Description ==
-The two cards are referred to as the microprocessor and SDI modules, according to their principal functions. They communicate with each other by means of two [[over the back]] [[flat cable]]s. Mounting hardware consists of locating brackets and bulkhead connectors for the shielded SDI cables leading from the disk drives to the UDA50's cabinet. An unshielded intra-cabinet SDI cable is provided with the UDA50.
+The two cards are referred to as the [[microprocessor]] and SDI modules, according to their principal functions. They communicate with each other by means of two [[over the back]] [[flat cable]]s. Mounting hardware consists of locating brackets and bulkhead connectors for the shielded SDI cables leading from the disk drives to the UDA50's cabinet. An unshielded intra-cabinet SDI cable is provided with the UDA50.
 [[File:UDA50 Field Replaceable Parts.png|400px|thumb|left|UDA50 Field Replaceable Parts]]
-Dual microprocessors on one of the modules execute independent microprograms to maximize subsystem throughput. Extensive buffering on the UDA50 modules matches host computer bus capacities to the requirements of high density disk drives. Direct connection of the UDA50 to each drive maximizes subsystem availability. Onboard diagnostic capability with fault reporting both to the host and through [[Light Emitting Diode|LEDs]] on the modules minimizes repair time.
+Dual microprocessors on one of the modules execute independent microprograms to maximize subsystem throughput. Extensive buffering on the UDA50 modules matches host computer bus capacities to the requirements of high density disk drives. Direct connection of the UDA50 to each drive maximizes subsystem availability. Onboard [[diagnostic]] capability with fault reporting both to the host and through [[Light Emitting Diode|LEDs]] on the modules minimizes repair time.
 === Microprocessor Module ===
-The UDA50 microprocessor module (M7161/M7485) contains two microsequencers which share an [[Arithmetic logic unit|arithmetic and logic unit (ALU)]]. The two microprocessors execute independent micro programs from [[Read-only memory|read only memory (ROM)]] also located on the module. One of the microprocessors, the UNIBUS microprocessor, handles transactions with the host computer and sets overall policy for UDA50 operation. The other, the drive microprocessor, handles interaction with the disk drives including error recovery.
+The UDA50 microprocessor module (M7161/M7485) contains two microsequencers which share an [[arithmetic logic unit|arithmetic and logic unit (ALU)]]. The two microprocessors execute independent micro programs from [[read-only memory|read only memory (ROM)]] also located on the module. One of the microprocessors, the UNIBUS microprocessor, handles transactions with the host computer and sets overall policy for UDA50 operation. The other, the drive microprocessor, handles interaction with the disk drives including error recovery.
 The microprocessor module performs all UDA50 interaction with the UNIBUS. It contains the two [[register]]s by which the UDA50 communicates with its host, and a switch pack for setting their addresses. It also contains a mount for a standard UNIBUS interrupt priority plug. Host software defines the interrupt vector address during UDA50 initialization, so no hardware means of setting it is required.
@@ Line 49: / Line 49: @@
 The UDA50 SDI module (M7162/M7486) is the physical connection to the disk drives. It conducts data and control transactions through two ribbon cable busses running between it and the microprocessor module.
-The SDI module contains [[termination|terminators]] for the SDI cables which connect the UDA50 to its drives. Since the SDI is a serial bus, parallel data in UDA50 buffer memory must be converted before being sent to a drive. This is done by two custom [[integrated circuit|LSI]] serialization/deserialization (SERDES) chips residing on the SDI module.
+The SDI module contains [[terminator]]s for the SDI cables which connect the UDA50 to its drives. Since the SDI is a [[serial]] bus, parallel data in UDA50 buffer memory must be converted before being sent to a drive. This is done by two custom [[integrated circuit|LSI]] serialization/deserialization (SERDES) chips residing on the SDI module. On a write, the SERDES chips serialize data for transfer to the drive. On a read, they perform the opposite function. The SDI module includes switching logic for multiplexing the SERDES among the four drives that may be attached to the UDA50.
 Also located on the SDI module is the buffer memory. Consisting of 32 KBytes of static RAM with a word cycle time of 55 nanoseconds, the buffer memory is sufficient for 52 sector buffers (26 KBytes) plus a buffer for 20 host commands (plus one for immediate execution) and the data structures to manage both dynamically.

← Older revision	Revision as of 16:15, 27 August 2022
(No difference)

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 [[File:UDA50 Field Replaceable Parts.png|400px|thumb|right|UDA50 Field Replaceable Parts]]
@@ Line 58: / Line 60: @@
 * UDA50-00 (old version: M7161 & M7162)
 * UDA50-A (upgraded version: M7485 & M7486)
 [[Category: UNIBUS Storage Controllers]]

@@ Line 1: / Line 1: @@
-DEC 74-26094-01
+[[File:UDA50 Field Replaceable Parts.png|400px|thumb|right|UDA50 Field Replaceable Parts]]
-DEC UDA50 BULKHEAD 4 PORT
+The UDA50 is an intelligent controller which interfaces up to four [[Standard Disk Interconnect#SDI Family of DSA Products| SDI disks]] to any [[UNIBUS]] system.
-[[UNIBUS]] [[disk]] [[device controller]]...
+The UDA50 uses a radial bus configuration instead of the conventional daisy-chain (serial) method.
 [[Category: UNIBUS Storage Controllers]]

← Older revision		Revision as of 08:18, 22 August 2021
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	{{stub}}		{{stub}}

−	[[Category: ~~DEC Boards~~]]	+	[[Category: UNIBUS Storage Controllers]]