Adventurer #05 30 ноября 1996

Железо

Obmen experience - A few useful tips and advice on connecting FDD 3.5 (three-inch floppy disk).

             (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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