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ASCII to USB keyboard protocol converter ======================================== This converts serial console terminal into USB keyboard, tested with TRS-80 model 100 TELCOM application. Target MCU is ATMega32u4 but other USB capable AVR will also work. Hardware -------- Connect RX, TX and GND to UART pin of AVR. Note that you may need line driver/level shifter like MAX232 to interface high voltage of RS-232C. Build Firmware -------------- Configure UART setting and Just use 'make' $ cd ascii_usb $ make Then, load the binary to MCU with your favorite programmer. Limitation ---------- - This cannot see key up event, you cannot hold a key. - Alt, Gui(Win/Mac) modifier key are not available. TRS-80 model 100 ---------------- Use TELCOM program with setting: 19200bps/8bit/odd parity/1stop bit To set this configuration push Stat(F3) and input '9801D,10'. Then push Term(F4) to connect.