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│ 5. TO HELP. │▐
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(C) Falcon/Atlanta h.g.
A few more words about
5'25 and 3'5 drives.
To comrades who are thinking of connecting themselves
second drive, highly recommend
get yourself a 3'5" drive. I,
at least I set it for myself, it helped
connect some of your friends and none of them
We haven't regretted this choice yet. By
at least when exchanging programs with my
My 3'5" friends didn't have one-
th case of data loss or unreadability
disks. However, I want to immediately warn you not
comrades who are very knowledgeable in this matter
- don’t expect to be able to write in dis-
ki all 1.44 Mb. Increasing disk capacity in
drives 5'25 (1.82 Mb) and 3'5 (1.44 Mb)
does not come at the expense of increasing the tracks on the dis-
ke - it is the same in all drives and
standard and equals 80 (except, es-
Naturally, there are 40 360 Kb drives
tracks), and due to an increase in the number
sectors (in MS-DOS on IBM/PC, for example, from
9 sectors per track up to 15 sectors for
drives 5'25 and from 9 to 18 in drives
3'5). In our case, this path is not possible
due to the inability of TR-DOS to adjust
fit under existing HARDWARE. In addition to everything
other things, if the drives have 5'25 rays
In our case, there was a jumper on the board, position
willfulswitch between 800 modes
Kb and 1.2Mb (see article in ECHO #1), then in
3'5 disk drives disk capacity determination
happens AUTOMATICALLY!
A little history: the first models of disk-
Dov 3'5 were designed for a capacity of 720 Kb
(developed by SONY in 1980), appearing
coming soon disk drives designed for
1.44 Mb, to ensure compatibility
Are they equipped with an auto-identifier of the dis- type?
keta (since the disks are 720 Kb and 1.HHMb
differ in the quality of the magnetic layer).
The autodeterminer is
simple mechanical microswitch,
installed in the drive. In floppy disks 3'5
inches high density (HD) on the left side
on the front there is a write protection latch, and
opposite her, on the right, - cut from -
hole (720 Kb floppy disks such a hole
do not have). To ensure operability
The disk drive must be carefully removed
the top cover of the drive and lock
microphone (if it works to open
just carefully remove it).
3'5" drives only require
one power supply - 5 volts. Interface
the connector, despite external differences, is half-
exactly matches the contact numbers with
ordinary. It should be noted that modern
models of some companies are produced without
Drive selection DIP switches A-C.
They are hardwired like drives A. These are
is determined by the IBM standard for
disk connectiondrives. To
simplify the connection of disk drives, they
are started configured as device A, and
The cord for the disk drives in the computer has 2
pairs of connectors. Each pair has
one connector for 3'5 drives and one for
5'25. In the cord of the selection line itself there is a disk-
The cables are connected like this: drive line A with
controller - to drive selection contacts
A of the first pair of connectors, drive line B
from the controller - to the disco selection contacts
water A of the second pair of connectors. Thanks
this, any device connected to
first pair of connectors, will be selected as
device A, and connected to the second pa-
re connectors - like B. In this case, you will need
children need to transfer the appropriate
wires on the drive connector. Just in case
In case, let me remind you the contact numbers:
A - 10 C - 14
B - 12 D - 6
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