Service manual
LEVEL7 Non-Maskable Interrupt Debugger Page 9
Rev. B02
UPS PORT WIRING OR FRONT PANEL LEVEL7 CONTROL
Several Alpha Microsystems computer systems include an external UPS port which can be used to
generate a power fail condition which will allow LEVEL7 to interrogate “locked” systems. These
systems include the following models:
AM-3000 (50 MHz version)
AM-4000 (AM-190 board)
Eagle 450
Eagle 550
AM-6000
You will need the following parts to generate LEVEL7 interrupts (power fails) through the external UPS
port:
•
1 SPST momentary push-button
•
1 female DB-9 connector
•
5 feet or less 24-gauge, twisted-pair wire
•
1 100 ohm resistor (for AM-190 rev B or earlier ONLY)
Unless you are using an AM-190 revision B or earlier CPU board, connect the push-button between pins
2 and 9 of the DB-9 connector. This is for all later model AM-190s, and all other systems listed.
If you are using an AM-190 revision B or earlier CPU board, connect the push-button to pin 2 of the DB-
9 connector, and one end of the 100 ohm resistor to pin 9. Connect the remaining side of the resistor and
push-button together so they are in series.
Some Alpha Microsystems computer systems have the capability of generating a power fail condition
through the TURBO switch on the front panel of the computer system. These systems include the
following models:
Eagle 450
AM-6060
The Eagle 450 (AM-138 CPU board) can be configured to enable the TURBO switch to force a power
fail condition for diagnostic purposes, thereby enabling LEVEL7 analysis. To configure the AM-138
board for this function, simply move the shorting block near the UPS external 9 pin connector J1 from
the UPS position to the FPSEL position.
The AM-6060 can also be configured to utilize the TURBO switch to trigger power fail, even though this
system has no external UPS connector. To configure this system to enable the TURBO switch to force a
power fail condition, install jumper JP5 on the AM-301-10 daughter board plugged into the main AM-
6060 CPU board. The position of this jumper is shown in the AM-6060 Service Manual furnished with
the system. Remember to remove the shorting block after completing the LEVEL7 analysis.
The TURBO switch on most Eagle 450 and AM-6060 systems is a latching toggle switch. Hence
you must depress it twice to set LEVEL7. If it is not a latching toggle switch, then you will only
need to depress the switch once.