RANA Systems Elite Controller, User Manual

Page: 281 / 328

ELITE SERIES USER MANUAL APPEN. A - DISK I/O
edge of the next we will define as a “bit cell”.
A byte would comprise eight consecutive bit
cells, the most significant of which is normally
referred to as cell 7 (with the least signifi—
cant being cell 0). Data is written and read
serially. During a write operation, bit cell 7
of each byte would be written first and 0 last.
when data is being read from the diskette the
same sequence applies. The third figure illus-
trates the relationship of bits within a byte.
These diagrams are a representation of what
occurs within the disk drive and controller
card. For the purpose of these illustrations,
the hardware interface to the diskette will be
represented as an eight bit “data latch”.
The final figure shows the three bits, 101,
being transferred from the data stream into the
data latch.
P a g e A - 1 0