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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Anesth Analg. 2020 Dec;131(6):1923–1933. doi: 10.1213/ANE.0000000000005220

Figure 2:

Figure 2:

(A) Front view of the Aspect Medical Systems A-2000 BIS Monitor.

(B) Detaching the display and front bezel reveals the Main PCB (Printed Circuit Board) within the body of the device enclosure behind. Dismantling the case in this way allows the critical computing components to be accessed easily with debug and test tools, while the Power Supply PCB and Interconnect PCB remain relatively protected against accidental damage.

(C) The Main PCB removed from the BIS Monitor, with critical components and interconnects labeled as referenced in the Methods.

(D) For comparison, a partially dismantled flash drive of comparable vintage. Data is stored on the highlighted TSOP chip, similar to the TSOP chip that holds the BIS software on the Main PCB.