Usb terminal emulator gpio
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- #USB TERMINAL EMULATOR GPIO SERIAL#
- #USB TERMINAL EMULATOR GPIO PLUS#
- #USB TERMINAL EMULATOR GPIO PS2#
SaviourInspirationThe countless stories and movies like the Lord of the Flies, Robinson Crusoe, Titanic, Cast Away, Six Days Seven Nights, etc. The remainder of the circuit is reasonably standard and does not need explanation. The microcontroller automatically determines the type of terminal that is connected on power up. It does this by measuring the resistance from pin 12 to ground. If it is less than 2K it assumes that a VGA monitor is plugged into the VGA connector and the video should be generated at pin 12 with the correct timing for a VGA monitor. Otherwise the firmware assumes that a composite monitor is connected and the video is then generated from pin 6 with timing to suit the PAL standard (NTSC can be selected on the setup screen). The video is generated from separate I/O pins on the microcontroller for the VGA and composite outputs. This enables the signal levels to be optimised to suit the type of display. Note that only one type of monitor should be connected at any one time. You can find images in high resolution copy on project page
#USB TERMINAL EMULATOR GPIO SERIAL#
The ASCII Video Terminal is based on a low cost 32-bit microcontroller from Microchip. Under control of its firmware this chip does almost everything including generating the video, decoding the keyboard, driving the USB, sending/receiving data over the serial interface and running the VT100 emulation. The only other significant component is a three terminal regulator used to provide the 3.3V power to the microcontroller.
#USB TERMINAL EMULATOR GPIO PLUS#
Power requirement is 5V at 50mA plus any current drawn from the 3.3V pin on the serial connector.
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#USB TERMINAL EMULATOR GPIO PS2#
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Single chip ASCII video display terminal with VT100 and VT52 emulation.The entire terminal (video generator, serial interface, etc) is contained in a single low cost chip. You can use it to build a complete terminal (as illustrated on the left) or as a single chip video driver, keyboard interface or whatever. The firmware emulates most features of the DEC VT100 and VT52 terminals and has extensions for graphics (lines, boxes and circles) as well as alternative fonts (large and jumbo). It has a serial interface with TTL or RS232 signal levels, input from a standard PS2 style keyboard and output to a VGA or composite monitor. There is also a USB interface which supports serial over USB and acts as a USB-to-serial converter. This is a complete ASCII VT100 compatible video terminal in a single chip. You can use it as a normal serial terminal with keyboard and display or as a single chip controller to add a video output to a Micromite, PICAXE project or other Single board computer.