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Posted by userbinator 11/2/2025

LM8560, the eternal chip from the 1980 years(www.tycospages.com)
135 points | 43 commentspage 2
anthk 11/2/2025|
Then in the late 90's and early 00's you almost got alarm clock at "Dollar Stores" for $15, and for really cheap pocket FM radios, you could get them as prizes with sodas and such, as a marketing scheme, with the soda logo printed in the device.

With no internet, often you were in $REMOTE_FORGOTTEN_RURAL_VILLAGE and the TV antenna didn't have tons of nearly TV repeaters/relays, you would love some FM/AM radio with cool stations reaching over 100 and 200 kms in case of AM ( I remember to listen heavy metal/gothic metal stations from Portugal in Spain within 100 kms from the border ). In Spain, either boring national and international pop radioformula, or soccer past dinner everywhere.

Oh, btw, one thing I hated from these clocks it's having to reset the time because it was misconfigured on a power cut. Nowadays they could just put some firmware and flash it for 0.0001 euros per device, if not less.

Scoundreller 11/2/2025|
I think some more advanced ones ran an internal “UPS” on 9V.

Effectively a relay that would be held by mains and fail to 9V if the power went out with some replacement 60hz signal.

As I recall, it would run the sound alarm but not the display.

timonoko 11/2/2025||
On that note. I tried to make candle replacement out of yellow LEDs in the 1980-years. To read books in de tent. But no matter how many leds I added it just was not enough.
fortran77 11/2/2025||
I remember how badly these radios would drift off-time when running on the battery backup! He explains in the article about how the back-up oscillator is a simple R-C circuit because the power line reference is absent.

It would also kill the backup battery in a couple of hours. If you're in an area with prolonged, frequent backups it wasn't worth installing the battery. It was only good for occasional, short blackouts of a few seconds or less.

Scoundreller 11/2/2025|
Probably didn't help that your 1980s and 1990s 9V battery was likely a zinc-carbon battery, about 1/2 - 1/5th the mA of alkaline.

I do remember that I could unplug and replug my alarm clock pretty quickly and it wouldn't lose its time if I needed to move sockets. Yay capacitors?

rajnathani 11/5/2025||
The part about the clock chip using the frequency of the AC power source as a clock source is pretty nifty, but then +-14 minutes/day of inaccuracy (+-2%) as the article mentions, is pretty off.
RicoElectrico 11/2/2025||

     Being not a programmed micro controller, the LM8560 is also a virtually eternal component. Many modern micro controllers incorporate a flash memory to store the software that let the controller work and execute the desired functions. Flash memories retain their content not for an unlimited lifespan. It may be several decades, but before or later it comes the day when they begin to lose their content, and the micro controller stops to work. This can’t happen to LM8560, because it doesn’t contain any flash memory.
That's a strawman, as the cheapest devices using microcontrollers use mask ROM.
userbinator 11/2/2025|
Mask ROM is actually starting to become less common as the price of OTP flash has dropped significantly, and changes can be implemented without paying for a new set of masks.
amelius 11/2/2025|
> “Digital” doesn’t mean necessarily “electronic”. It means that the time is show actively by digits and not by hands.

Kind of weird since digitus means finger.