Canon A-200 series Service Manual page 49

• RAM
(Random Access Memory)
On the main P'C.B, there are 36 dynamic RAMs whose respective storage capacity is 65536
words x 1 bit.
Everyone byte (8 bits) of data has one parity bit and therefore, actually 32 of 36 RAMs are used
as system memory. So,
64K-bit x 32 peaces
=
2048K bits
=
256K bytes
of storage capacity are available.
Above LSls are connected to the address bus, data bus and control bus so as to synchronize
their functions effectively, and are controlled by the CPU directly or indirectly.
At the same time, the signals through these buses are sent to the optional slots and control the
monochrome or color display adapter board or any other option boards.
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