Doc 296-9, Exhibit C is part of the patent prosecution history, is
considered intrinsic evidence and was admitted as evidence. It is a letter
from Norbert Daberko, a named inventor, to the patent examiner, Mary
Washington, on 16 Dec 1994. The letter of the subject is "Description of
Circuitry in Flashback". The following paragraphs are direct quotes from
this letter:

Micro-controller
The micro-controller is the heart of Flashback. It contains the 8-bit CPU
which is used as a state machine to drive all functionality of the unit.
This functionality includes keypad command interpretation, monitoring of the
memory interface, file system implementation in FLASH memory, driving status
displays (LED's), power management, and data pump activity. The
micro-controller executes code out of its internal ROM and RAM. (emphasis
added)

DSP and CODEC
The 16-bit DSP is used in this application for PCM data compression and
decompression. Its purpose is to take the sampled PCM data that the CODEC
generates from the audio input and compress it during "recording". During
"playback", the DSP decompresses PCM data and feeds it back to the CODEC for
audio output. The DSP uses a 32.768Mhz crystal oscillator. Data transfer
to/from the CODEC is at 64KBps. Currently there is a 1MB DRAM (emphasis
added) attached to the DSP on a local bus that is used for local variable
space, and data is transferred between the micro-controller and the DSP via
the micro-controller's 8-bit data bus.

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The following picture is from Doc 296-9, Exhibit D, is considered extrinsic
evidence and was admitted as evidence. This is the picture Mr. Yungwirth
showed Dr. Mihran during the Markman. It is a picture of the inside of the
Flashback and inside the red circle is the DRAM. Dr. Mihran testified he
believed it is DRAM based on the number on the chip.

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The following pages are from Doc 296-9, Exhibit D, are considered extrinsic evidence and were admitted as evidence. This shows the features of the SMC88XXX family of microcomputers used in the Flashback and RAM is clearly seen.