Yep, looks like two shift regs. Could you get a pic of the text on it?
They should be 4021’s.
…I break down and ask someone who knows. 
That’s how I got to know these things.
@Sokol1 has been an incredible source of info, as has mega_mozg, who wrote MMJoy2.
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[IMG]
HEF4021BT
L2K2Z505
UnD13334
NXP
[/IMG]
Here you go 
Yep, 4021.
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we use common methods obviously 
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