That's an 8-bit microcontroller. 64 bytes of RAM, 1024 words of ROM, 13 GPIO pins, running at either 4mhz or 8mhz. Given that they're only doing a 3v battery here and I don't see any voltage conversion circuitry, I think it's running at 4mhz.
2:41 AM · Sep 4, 2020
It also doesn't look like you can pull the ROM off the chip, at least without their proprietary online-activation-required programmer (and possibly not even then), so unless someone wants to decap this chip and read out the bits from the silicon, we can't put it in MAME either.
Here's the post that I was referencing:
My wife had been checking if she was pregnant, initially with test strips, which can cost as little as 20 cents each. She got some positive readings, so wanted something "more accurate", a digital test. Here it is. $12/ea, and it literally just reads a test strip. What a scam.Show this thread
There's also a hole on the grabby end of the tester, but you're not supposed to put anything any here, apparently. I think it's just here so they can wedge a bit of plastic in here before final distribution, which'd keep the battery from making contact and potentially draining
but yeah, as for "WHY DOES THIS EXIST" when it adds basically nothing over the manual version that just shows you lines? It's a scam, basically. Computers are cheap now. People are buying the digital one thinking it's the more accurate fancy model, but it's the same.
BTW, to answer a suggestion no one has made yet: Yes, I could replace the microcontroller with an alternative one that CAN run doom, but: 1. it has to run on 3v, which is tricky 2. it has no inputs but "pee on it" 3. the LCD can only show "pregnant","not","manual","wait"
in any case, the final tl;dr: don't waste your time and money on the digital readers. Just get the cheap analog ones, specifically the kind that are just a box of test strips. For the price of this device you can get like 25 test strips, and it'll create less e-waste.
Anyway, if you want to support me buying stupid things like pregnancy tests just to take them apart, feel free to send me a dollar or two on ko-fi! ko-fi.com/fooneturing
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