These acronyms are found in the patent. Hyperlink: https://docs.google.com/viewer?url=patentimages.storage.googleapis.com/pdfs/US5388841.pdf

Abbreviation Description Patent half-page Patent line
DACK data acknowledge 42 1
CACK cache/code acknowledge signal 41 68
PACK plot acknowledge signal 42 1
PLEQ plot address equal 40 65
LDPND load bit pending register signal 36 2, 48
CLRPND clear bit pending register signal 36 1, 49
FRMULT fractional signed multiply 26 46
LMULT long multiply 26 47
RFSH memory refresh signal 7 68
DATLAT data latch signal 42 62
DATARQ data request signal 43 25
PLTRQ plot request signal 43 29
CACHERQ cache request signal 43 14
O/RANGE out-of-range signal 47 51
PCEN program counter enable 48 36
CCHLD cache loader signal 51 30

These acronyms are found in book 2 of the Nintendo documentation:

Abbreviation Description Page
CN character number
POR plot options register 2-9-39
COLR color register 2-8-13