5 ms·
Also I find the following very intereating. Because no CADs existed, old CPUs were drawn with pen and paper. The process of getting it to lithography was called
by miohtama 6y ago
Also I find the following very intereating. Because no CADs existed, old CPUs were drawn with pen and paper. The process of getting it to lithography was called Rubylith.
https://en.m.wikipedia.org/wiki/Rubylith https://en.m.wikipedia.org/wiki/Rubylith
Here are some historic photos with master prints of CPU
https://www.team6502.org/ https://www.team6502.org/
- segfaultbuserr 6y agoThe origin of the term "tape-out". Circuit boards were also designed in this way. https://www.eetimes.com/how-it-was-pcb-layout-from-rubylith-to-dot-and-tape-to-cad/ https://www.eetimes.com/how-it-was-pcb-layout-from-rubylith-...
- Taniwha 6y agoYup, I did this as a kid in the mid 70s - PCBs were done at 2x, red and blue tape for 2 layers - you drilled holes yourself, no plated thru holes