Look at it! Years before translucent iMacs became a thing, Radio Shack sold a series of clear landline phones, including this number…
100% through-hole components and an actual, physical, ringing bell. This one also had incandescent bulbs in the handset and base that would flash when the phone rings (a later model used neon tubes).
The “P / T” switch selected between pulse and tone dial modes, as a few phone exchanges still couldn’t handle this newfangled tone dialing thing.
The electronics are almost entirely discrete, with ONE single IC chip in the handset:
…a UM91210 Tone/Pulse dialer with redial memory. “UM,” by the way, stood for Unicorn Microelectronics. For reals. I am not making this up.
“Speed dial” in those days consisted of a small slip of paper on which frequently-used numbers could be written:
But my favorite detail of this phone…it’s most distinctive, most “period” attribute, even moreso than a cord or bell…is a subtle thing right here:
Prior to an anti-monopoly ruling in 1968, buying a home telephone was not an option…all equipment was rented from AT&T. To minimize returns and service calls, their gear was incredibly overbuilt, indestructible…and heavy. The new third-party telephones were less durable and less expensive…but to mimic the familiar heft of classic phones, it was common to have idle weight bolted in both the handset and base. This pattern persisted for years until cordless phones and lightweight office handsets became a familiar norm.
Old electronic equipment is sometimes derisively referred to as a “boat anchor.” These vintage phones literally incorporated anchors as a feature.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Python for Microcontrollers — sysfs is dead! long live libgpiod! libgpiod for linux & Python running hardware @circuitpython @micropython @ThePSF #Python @Adafruit #Adafruit
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
More interesting is what tech was “high tech” when this was a thing (I remember being tiny and wanting this EXACT phone from the catalog!)
This was around the time that services started becoming more digital. I live in CT, and we always had our own independent phone company, one of the few that remained always away from Ma Bell– SNETCO. They were quite quick in moving to digital switching, and processor controlled IO. Around the late 80’s they came out with a service called TotalPhone.
It was based around the button to the right of the p/t switch, labelled reset. What it did was disconnect the tip (tip top, ring red right) for a specified number of milliseconds based on the circuit. Apparently it was standardized enough that SNETCO could detect the disconnect and instead of disconnecting the call, could do things *impossible* until then on a single line, like put the call on hold, let you call someone else, and upon hitting the reset button again, conference the two together–for $5 a month.
At least, this is how I remember that button, it may have been later that it was standardized. But still. I’m only 34–today is my birthday–and this pops up on feedly.
The phone company also used to charge extra for touch-tone dialling. My parents wouldn’t spring for it even after we had a push-button phone in the house, so you could hear the phone simulate the switchhook clicks of a rotary phone every time you dialled.