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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