[MattPearce]

Someone on Twitter found a presentation detailing the design of this device https://webpages.uncc.edu/~jmconrad/ECGR6185-2013-01/Present...

> GBA Display used has small size and light weight... GBA Gaming displays have excellent graphics processing capability for plotting... The proposed system has relatively lower cost

[joshumax]

This is insane! They even hooked the ECG measurement circuits to the Gameboy via the flash cart!