(C) ZX-REVIEW (6'96)
(C) Condor Soft
In early May, looking straight from the tin room
"ZX-REVIEW", I came across prelyubopytneyshuyu page for 3.5
"drives. The idea of writing an article on this
theme suggested itself for a long time, but due to lack of
knowledge of where to start, somehow postponed. After reading
this article, I decided to reprint the most interesting
moments, providing his own commentary. What came out of it, see
for yourself:
Currently, the most common storage devices for computers
such as the Spectrum is a 5.25 floppy drive. "However, this
device has number of shortcomings, such as:
- Decent value of 5.25 "drives
(200,000) compared to 150 thousand for 3.5 "
drive. (Prices include
value of imported drive, because
local disk drives to 3.5 "on
apparently does not happen, so that comparable
vat is something useless, and
domestic hard drives
include disk drives, such as
mi / although this is only my personal to me
of /);
Editorial note: the above prices - for the city of Yaroslavl.
- Big noise level when positioning
Vania heads (especially disk drives
domestic production);
- Lack of security 5.25 "Thesis
Cove, compared to 3.5 "(soft open
th envelope against the hard plastic
ductor package with a metal protection
one);
- Rapid deterioration of disks in common work
those with the operating system (especially
it is noticeable when working with IS-Dos).
Given all the above, I think
You need to give some useful
tips and advice on connecting FDD
3.5 "(three-inch disk drive) to" ZX Spectrum ":
- First problem: matching signals
tional connector drive systems
nomu loop TR-DOS. It is solved
simply due to the complete identity of
pinout connectors 3.5 "drive and
5.25. It is enough to buy a standard
LIMITED connector for FDD 3.5 "and install
it on the trail system, going to 5.25 "
drive or buy an adapter,
providing docking FDD 3.5 "with
connector designed for connecting
radiation FDD 5.25 ". connector pinout follows
following (a view of the drive behind):
....
1234
√ connector on nutrition:
1 - +12 V
2 - general
3 - general
4 - +5 volts
- Usually on a new drive jumper
select the drive is installed in the positive
mapping "C", but when first connecting
I recommend to pull the signal
connectors of the other drives,
as Simultaneous sampling of two FDD
can lead to failure of the
Both drives (though not always,
but does not prevent the safe side). In no
which drives the system of choice
implemented fully, for example,
one set only two
choices: "A" and "C"; while the other
elastic pins for the jumper settings
replaced pads.
- Since 3.5 "drives have the same 80
tracks as 5.25, it is clear that
capacity of 1.4m (take it as a basis,
as look for a three-inch drive on the
720 k just pointless - to make sure
on personal experience) provided an increase
increasing density recording (quadruple
spectral density), which does not work
em VG93. Therefore, Spectrum does not
be able to read floppy disks formatted
bathrooms at 1.44M and more.
In FDD 3.5 "hardware-based modes with two types of disks:
DD (2DD) and HD (2HD). To work with the Beta Disk
Interface required first regime (because of
impossibility of a second).
It should be noted that it is possible to use any discs at
720 k and 1.4m. Personally, I used discs at 1.4m. I use the 3.5
"drive and a half years and very happy with it.
P.S. In order to easily change the drive as the default, I
use the usual type of switch P2K with independent fixation. It
must be soldered a break from the computer system plume
to the floppy disk, the contacts 10 and 12.
10
12
\ \
\ \
October 1912
On the purchase and installation
3.5 "drive and purchase the software on three-inch diskettes -
contact the firm" Condor Soft " (Yaroslavl radio market in the
"Mill") and call:
for the inhabitants of Yaroslavl - 35-13-02
for area residents - (822) 35-13-02
for other regions - (0852) 35-13-02
OR
Mail us at:
150030, Yaroslavl, a/ya-45, "Condor".
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