How many max7219s can arduino nano 328 control?

Using Arduino LEDs and Multiplexing
8

OK !!! I GOT IT....Iwant to thank Pedro for referring to JoeN...I used his sample code to get my 32 x 8 working..FINALLY!!!!!!

My code is attached..I'll make a video of it tonight.....

THE_BEST_SCROLL_32x8.ino (9.58 KB)