...live long and prosper...
A simple homebrew-like computer based on the 8085. My first assignment in the Electronics Lab.
The 8085 computer

The story

The 8085 computer has been a standing project in the lab. Based on work from previous years, students are called to utilise the knowledge they've acquired during the first semester (which I did not take) to construct the computer based on the schematics provided. Furthermore, each group is assigned a side-project, which usually is the addition of one of a few peripherals available, such as a keyboard, character LCD or, alternatively for the most daring, a full-graphic LCD, external sensors and so on.

My story was a bit braver, though. Not having attended the first semester of Microelectronics, I decided to take the second half of the course and see what happens. I originally was the third member of a group (which are always comprised of two) but I soon decided to go on my own. To make things worse —or better, depending on which side you look at it— the schematics we were given were wrong.
Fortunately, I never looked at them but relied on a basic logic map and the datasheets of the components. That added a little more to my accomplishment. Pursuing a different wiring strategy than the rest also made an impact, as did the fact that my board worked from the beginning, without any corrections.

Finally, that project got me a straight 10 that semester, but that was not the best I got from it. Being able to pull this off, it made my reputation in the Electronics Lab and paved the way for more.
Thank you, little 8085!


NEC 8085 Processor
Hyundai 6264 8KB SRAM
OKI 8255 Parallel interface
Intel 8279 Keyboard interface
Intel 8251 Serial interface
Intel 8253 Interval timer
Motorola MC14411 Bit rate generator
Maxim MAX232 RS-232 transceiver
National Semi 74LS374 Octal latch
National Semi 74LS138 Demultiplexer (x2)


Breadboard 8085 computer
Side view
Breadboard 8085 computer
Full aerial photo
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