data to follow 512 counter 9 bit binary counter built from 3 x TTL 74LS90 ic's. 8 bits are one byte so basically this is a 2 byte counter. By adding one more 7490 the capacity is greatly increased to 4096 which would make it a 16 byte counter and capacity eightfolded. TTL IC's work on 5 Volts DC
Parts required for this counter 3 x 74LS90 IC's 9 x 300 or 330 ohms resistors ¼ Watt 9 LED's (10 millimeter) any size or colour can be used. some Vero board and hook up wire.
I used the 10 or 1 Hertz pulse from my breadboard set up. so you may have to make up a 555 timing circuit to clock the A(14) terminal of the first TTL IC.
