Slob
Experienced Member
One of the more satisfying projects that I did this year was to modify an earlier project (described at http://www.vcfed.org/forum/showthread.php?60670-Tiny-Wireless-8008-Emulator) so that it could be standalone. With just the ESP8266 (ESP-12E, ~3-4USD) and a few other components, this has software defined 24x80 NTSC video terminal output and PS/2 keyboard input (the ESP8266 creates the video directly by bit banging, there is no "video board" or other digital circuitry). Due to processing and RAM limitations, the serial port and wireless had to be removed.
After it was done, I wondered just how far I could push the ESP8266, so I added a "pull through" optical paper tape reader. using HC14's and an HC165 serializer. No precision tools other than a drill press, a scroll saw, and Eyeball 1.0 were used in making the paper tape reader. However, due to stupid choices that I made with resistor selection, it can only read black or Mylar tape.
This is better described at:
https://hackaday.io/project/162182
https://hackaday.io/project/161404
The first link above describes the PTR, the second the 8008 emulator and its code.
The mini-monitor displayed is something I built from a $30 eBay LCD and controller combo, that displays NTSC. The emulator also works fine on a tube display; I just wanted something similar in scale to the emulator. Now, if I could only find a good, small PS/2 keyboard...
After it was done, I wondered just how far I could push the ESP8266, so I added a "pull through" optical paper tape reader. using HC14's and an HC165 serializer. No precision tools other than a drill press, a scroll saw, and Eyeball 1.0 were used in making the paper tape reader. However, due to stupid choices that I made with resistor selection, it can only read black or Mylar tape.
This is better described at:
https://hackaday.io/project/162182
https://hackaday.io/project/161404
The first link above describes the PTR, the second the 8008 emulator and its code.
The mini-monitor displayed is something I built from a $30 eBay LCD and controller combo, that displays NTSC. The emulator also works fine on a tube display; I just wanted something similar in scale to the emulator. Now, if I could only find a good, small PS/2 keyboard...