Green’s Dictionary of Slang

(US Und.) a cash register.

1914		Jackson & Hellyer Vocab. Criminal Sl. 23: chip [...] A cash-box; a till; a cash drawer without belling device. A cash receptacle with a belling device is called a ‘combination chip,’ or a ‘damper,’ or a ‘dinger’.
1929		E. Booth Stealing Through Life 300: Try that chip. See if it’s sloughed.
1931–4		D. Clemmer Prison Community (1940) 331/1: chip, n. A till in a cash register.
1949		Monteleone Criminal Sl. (rev. edn).
1952		C. Hamilton Men of the Und. 321: Chip, A cash register.
1960, 1975		(ref. to c.1935)Wentworth & Flexner DAS.