A very simple terminal created by two Pic Microcontrollers. The first being an 18F1320. It is used for the keyboard scanner and it outputs a TTL level RS232 signal to the video chip. The video chip is a dsPic30F3012. It is receives the TTL signal and outputs the character on the screen. Is can output an NTSC 40 x 24 characrter screen based on the ASCII table. The upper 128 characters in the table are set up as simple graphics.
Tags: rs232, ttl, pic, picmicro, microcontroller, terminal, ntsc, ti-99/4a, 8-bit, asm, assembler, monitor
