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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 4:

Figure 4:

Screen displays on the A-2000 BIS Monitor at key moments.

(A) The ARM internal software periodically calculates a validation checksum against itself to assure its own integrity. If this test fails, the device displays an alert and halts as shown, entering an infinite loop that can only be reset by turning the device off and on again.

(B) The moment during startup at which the device uses its main ARM processor to test the function of the TMS320C32 DSP chip and then initialize it with the software that calculates BIS parameters.