Mystery solvedThanks to Don Lyle and his colleagues the display has been identified as a B6700 "CLUSTER DISPLAY PANEL", from SECTION 6 of the Burroughs Data Communications Processor Reference Manual (this text is from the B6500 manual which changed for the later B6700 model):
GENERAL
The Cluster Display Panel is independent of the data communications system. It may be temporarily connected to groups of up to 16 Adapter Clusters for maintenence purposes. The Cluster Display has various switched and push-button indicators which are used to provide full control capabilities of the cluster interface in the same way a DCP controls the cluster interface (figure 6-1).
OPERATION
This display may be used interactively while the Adapter Cluster is also being used by the data communications system (DCP). The Cluster Display contends for the Adapter Cluster just as does the DCP causing no timing conflicts.
The Cluster Display provides the ability to setup the A register, as does the DCP, and performs the same reads, writes, or interogates and then looks at the results in the A register again.
SWITCHES AND INDICATORS
...see table below...
The Burroughs B6700 Reference Manual in Section 11, pages 11-3 and 11-4:
ADAPTER CLUSTER
The Adapter Cluster is the interface between the DCP and the data-communication Line Adapters. Each Adapter Cluster services up to 16 Line Adapters. Data transmission rates of from 45.5 to 4800 BPS are handled simultaneously by the Adapter Cluster.
The Adapter Cluster basic functions are:
1. Line termination: scanning, clocking and temporary storage.
2. Character assembly and disassembly.
3. Synchronization attainment and maintenence.
4. Timer operation to maintain line discipline.
5. Some character recognition. (Mainly synchronization characters for the various line disciplines.)
6. Information exchange with one or two DCP's.
The Adapter Cluster functions in a manner that makes it appear transparent to most characters and message formats. However, as stated in item(5) above it does recognize the synchronization characters in order to attain and retain synchronization when operating in the synchronous mode.
| Display Label | Function | NOTE: Text taken from the B6500 DCP manual so may be wrong as this panel is from a B6700 | CLUSER LOCKOUT
7..0 | ? | | A REGISTER
AA6F.. AA4F | | These two-position switches designate the adapter cluster address (as does the AA[?:?] register in the DCP) selected by the Cluster Display Panel. | A REGISTER
AA3F..AA0F | | These push-button switches designate the particular adapter (as does the AA[?:?] register in the DCP) selected by the Cluster Display Panel. | A REGISTER
AC4F..AC0F | | These push-button indicators designate the specific operation (as in the five low-order bits of the AC register in the DCP) requested by the Cluster Display Panel. | A REGISTER
A18F..A10F | | These push-button indicators designate the information required as specified by the AC field (as in the AU register in the DCP) for the Cluster Display Panel. | CONTROL
SC1F..SC0F | | | | ENABLE / AA (3,4)F | | | TRANSFER CONTROL
RUN NEUT STEP | | NEUTRAL. No operations are initiated from the Cluster Display Panel.
RUN. The designated operation recycles until the switch is returned to NEUTRAL.
STEP. This spring-loaded position returns to NEUTRAL after permitting a single operation of the specified operation. | | BIT RESET | | This push-button switch, when used in conjunction with a push-button indicator, clears it to zero. | | CLEAR A REG | | | CONTROLLED CLOCK
STREAM | | | | SINGLE PULSE | | | DISPLAY STATE CONTROL
CAN | | Any Cluster Attention Needed signal (CAN) is serviced by the Cluster Display Panel without waiting for a response. | | CWR | | | | ITG | Interrogate | A Write operation occurs using the information in the Cluster Display Panel. The Cluster Display Panel waits until a response is returned to the display push-button indicators. | | LOCAL | | | | WORD | | | | AUX | | | | DISPLAY EX BUSS | | | | DISPLAY EX CONTROL | | |
Original question
Liam Quin found an interesting piece of Burroughs history and posted photographs. I contacted Liam and he kindly provided an additional photo of the item.
A quick scan of the available Burroughs manuals did not reveal which machine and subsystem it is from, if anyone can help us out please send an email to nw@retroComputingTasmania.com
Liam provided the following description:
On the back of the panel (I no longer
have an enclosure) is a label saying, PANEL C, with B-1148 6271,
and also a smaller label with No. 23088339 (the number hand-written)
and, printed ,PN 23300866, with, in pen, 006 RW after it
The wires go to 2 connectors, labeled (in pen, by hand) CONN-1 and
CONN-2 respectively.
The panel is a little over 7 inches square.
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