Basic Operation - Sharp MZ1F10 Service Manual

(4) Magnification of the C Part
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3. BASIC OPERATION
3-1. Seek Operation
The step for seeking is generated by FPU (NDC 840). The
step rate is designated by a command from the host.
- DIRECTION I N
-S TEP
1-80 mS
L
A cco rd i ng l o ll e p rat e
- 5 -
Seek
1 step output
3-2. Read Operation
-
M Z - 5600A
In the read operation , the ID read is first executed to find
the designated sector. On finding the desired ID field , data
are read.
The data read by the disk are separated.
NRZ Data and Clock from MFM Data are transferred to
NDC-840.
The data are converted from serial to 8 -bit parallel and are
transferred by DMA to RAM .
Error detection is executed in NDC-840, and if the error is
less than 11 bits, error correction is executed in association
with CPU-Z-80.