Sharp MZ-5500 - Page 55

Table 7-1 FDD specification
Recording capacity (formatted) 320KB
Sec tors
16 sectors/track
Tracks
40 tracks/side
Recording surface
Two sides
Track density (TrI) 48
Recording density (HPl) 5876 (max)
Data transfer rate 250KB/s
Recording method
MFM
Transfer method HFM
Access t~me:
Average
93ms
Track to track
6ms
Settling
15ms
Head
load mechanism
None
(head load time=O)
7-2. HZ-5600 MFD (640KB) interface general description (MZ-5600)
!
Sincc tlle MZ-5600 ' series are equipped with a large capacity mini-floppy disk
driv e , the MFO interface for the MZ-5600 series is different from that for
tll e MZ-5500 series in detail.
The MFD interface can control up to four units of the HFD , drives and, in
addi tion, the HZ-5600 has the expansion MFD interface connector on the"back
of the machine which permits expansion of two more units of the external
MZ-IFIJ mini-floppy disk drive options. The MZ-5631 permits internal
expansion with the MZ-1F15 mini-floppy disk drive.
WllPn using the 640KB (200) disk on the MZ-5600, it is possible to read from
(lllci write to the disko However, when using the 320~B disk, only reading is
possible as it is designed to read the disk which has been created by other
mod e l of personal computers such as the MZ-5500. To read the 320Kß disk, '
"0" 1ll1lSt be specifi ed [or the FD l~gical number. For more details, refer
t C) th e CP/l"1-86 and MS-DOS manuals.
256 B
In the ease of the 640Kß mode, the
djsk recording surface is divided
into 80 tracks along the radius of
the disk as shown in Fig.7-3 .
Track numbers from 0 to 79 are
provided for both sides of the
disk, respectively. Sec tor numbers
Cld~ 0
from 1 to 16 areassigned on each
side. Track number and the sec tor
DAT{\
Gap +i~lct
lI '
' lT~(J 1
number are used altogether to
represent the specific disk
Iocation. 256 bytes of data can be
stored in one sector, and read/write '
js permitted in terms of sector.
Fig.7-J indicates the soft sector.
Sec tor address information (track,
Fig.7-3 Disk and software
\t
side, sector) is contained in the
example (04OI<B)
10 field which is searched for when
reading or writing data. The ID
ffeld is created at the time of
disk formatting (initialization).