docs/datasheets (third-party)

TTL: 74139 74150 74192 74194 (+ truth table PNG) 74240 74244 74245 74374 744078 7474 7483 7485 74HC/HCT04. Memory: AS6C62256 / AS6C6264 SRAM, 28C64 / 27C64 / 27C256 (E)EPROM, 24LC64 / 24LC512 I2C EEPROM, MX25L4006E flash. I/O: PC16550D UART, MAX220–249 RS-232, UM245R USB FIFO, TIL311 hex display (two different sheets: TI Rev D and a distributor sheet). 1802 Microprocessor Instructions.pdf is for the RCA 1802 (RC/asm's origin), not YACC1; its duplicate download was dropped 2026-09-20.