![Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later](https://preview.redd.it/texas-instruments-tms2532-1979-vintage-eprom-used-in-switch-v0-6ujltqzfspva1.jpg?width=640&crop=smart&auto=webp&s=4ff5874f8268e5412deda4d615b15f5db2dc766f)
Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later
![Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later](https://i.redd.it/texas-instruments-tms2532-1979-vintage-eprom-used-in-switch-v0-rwcfnscgspva1.jpg?width=6800&format=pjpg&auto=webp&s=82867f9dedd5cca09e1f1d2f240233350f08514e)
Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later
![Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later](https://i.redd.it/texas-instruments-tms2532-1979-vintage-eprom-used-in-switch-v0-hc7hjgojspva1.jpg?width=6800&format=pjpg&auto=webp&s=bd6351abed3349aaf22cbde0e35018cc391253d4)
Texas Instruments TMS2532 - 1979 Vintage; EPROM - used in #1ESS switch from Western Electric. For those not familiar the #1ESS was used as a local switch in the Bell System later
![using single button to toggle states and writing and reading to eprom - #17 by nzmxp - Project Guidance - Arduino Forum using single button to toggle states and writing and reading to eprom - #17 by nzmxp - Project Guidance - Arduino Forum](https://europe1.discourse-cdn.com/arduino/original/4X/5/6/b/56bdc3c8b92f233eaa5cb48a1d14f87de19aaf0d.jpeg)