alt Hacker NewsYeah... I remember designing these into circuit boards. They were much cheaper than EPROMs, so we did development with EPROMs and production with PROMs.
And then we desoldered and replaced all the PROMs when we found a problem.
Yeah... I remember designing these into circuit boards. They were much cheaper than EPROMs, so we did development with EPROMs and production with PROMs.
And then we desoldered and replaced all the PROMs when we found a problem.
I don't miss those days. Constantly having chips in the eraser while you debugged the running version on the board and then finally programming an OTP (One-Time Programmable) device when you were ready to ship. I remember Parallax had some development devices that were a battery-backed static RAM with a cable that plugged into an EPROM socket. Faster to program and no eraser needed.
Still, when cheap Flash came along in the mid-90's, it was a godsend.