The DELQA (M7516) is a dual width Q-Bus Ethernet controller found in most Q-bus based MicroVAXen. This controller is designed to connect to a "cabinet kit" that mounts in the back panel of a BA23 or BA123 cabinet. Sometimes they were used in BA2xx series cabinets with a special S-box handle that connected to the card. Later the DESQA came out that has the S-box handle built on to the card as a single unit.
The DELQA has a five switches in the upper right corner of the board, it has no jumpers. These switches control the following things:
Switch 1 - DELQA Base Address
CLOSED 17744408 OPEN 17744608
Switch 2 - Reserved
Switch 3 & 4 - Mode and Option
Normal CLOSED Remote Boot DISABLED CLOSED Remote Boot ENABLED OPEN DEQNA-Lock OPEN Sanity Timer DISABLED CLOSED Sanity Timer ENABLED OPEN
"Remote Boot" is a facility where you can send a MOP packet to your VAX and it will reboot. Its kind of handy if you're trying to debug it from a different room, but its downright dangerous to leave on if there are malicious users around. There are also indications in the manual that you can call up a console on the DELQA using the MOP console protocol but it isn't clearly described if that is a test console on the card or if it actually gives you the VAX's console. More investigation needs to be done.
The "Sanity Timer" is a watch dog timer that can be used to reset the VAX if the software hasn't told the DELQA board that it is still running. These days this is called a Watchdog Timer, when the board is set with this enabled you VAX will periodically reset itself!
Switch 5 - Reserved
The DELQA card has a 20 pin keyed connector on the top left portion of the board. The pins are connected at follows:
The LEDs on the DELQA are numbered 1 to 3 with number 1 being closest to the 20 pin IDC connector on the boards top edge. When the power is applied the LEDs go through the following sequence:
|ON-ON-ON||Initial Power-On (note that if the board is configured in "DEQNA Lock" mode all the LEDs simply stay on from power up.|
|ON-OFF-OFF||Executing Internal logic self test|
|ON-ON-OFF||Self test executing external loop-back test|
Flashing LEDs indicate an error of some sort.
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