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 "~ROV PAI~O ALTO RESEARCH CENTER
/\L  /\.. Engineering & Software Group

                                                            August 11, 1976

 To:         Al to Users

. From:      Roger Bates

 Subject:    TRIDENT disk for the ALTO

 source:    TRIDENT.EARS

This memo describes the facility for a new 80 megabyte capacity, 9.7
megabit transfer-rate disk for use on ALTO computers. The new disk is
implemented in addition to the standard ALTO disk. This simply means
that new microcode tasks (one for output and one for input) must be used,
leaving the standard disk microcode intact.       The requirements for
implementing this facility are a T-80 disk ($6500), a disk control board
($800), and an ALTO which has been modified for double word store
operation 1.




                           1.   The Basic Disk System

The disk controller is designed to drive any: member of the TRIDENT family
of disk drives manufactured by CALCO:f..1:p2. This is a very recent product

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