Apple II - Page 82

Chapler <1 1he Inside Story
Figure 4-4
An assortmentot ROM chips
-
~~- •. -~ •. ---=~ ,.-~.--~.==.~~.
Figure 4-3
RAM clips
RO~t (for read-only memory), on the other hand, is pemunent
]{O_\1 stores progr:lms lhc computer uses to pcrrorm some of its
usks TIle programs fCl112in in RO.\I even when lhe po'o\'Cr is off
Ilcsidcs storing progr.trns ror operalions within the compuler, RO.\\
also carries the Applesol"t BASIC computcr language. Figure 4-4
shows 5C\'Cral different RO:'l chips
In addition to me RAM, ROM, and the microprocessor, the main
logic
bo:lrd bears CUSlom ICs that interrace, or handle
communications, bclwcen the microprocessor and pcnpheral
devices.
How it works
"l1lC best way to view the relationships among thc.se pans is to look :11
what happens when you SUll thc compulcr and run a program