6-bit static display circuit

Shown is a 6-digit static display circuit . In the figure, 74LS244 is a bus driver. The 6-digit digital display shares a common bus. Each
LED display is connected to a latch (such as 74LS273) to latch the display code of the data to be displayed. The display code of the displayed data
is transmitted from the data bus to the input end of each latch via 74LS244, and then latched by the specified latch through the address decoder 7415138.
    The bus driver 74LS244 is controlled by IOW and A9. When the output instruction is executed to make W and Ag low at the same time, the 74LS244 opens
and transmits the data on the data bus to the corresponding latch (74LS273) of each display. In the circuit shown in the figure,
the addresses of each display bit from left to right are 100H, 101H, 10ZH, 103H, 104H, and 105H.