Hardware - connection to the Spectrum 3'5 drive.

M.M.A/SPEED SO.                           
                                          
                                          
Have you  noticed that  how  has risen in price recently
time  our favorite "five-inch" discs?
And... In your  city they are generally on sale
no! Crisis, crisis is coming.....        
                                          
                                          
In such conditions it is inevitably slow,
but  correct  creeping to "three-inch"
drives  and disk drives. Connection diagrams for these
beautiful devices have already been described many times -
have appeared in the literature, but there are still some
which  unlit,  "about three inchesproblems." One of them is clarified below by our
correspondent.                            
                                          
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 ╔======================================╗  
 ║  INSTALLATION FDD  3.5'  ║  
 ╚========================================  
                                          
   If you are reading a newspaper ONLINE, then replace
or  that  in  many  cities of the Union  on
SPECTRUM started installing FDD 3.5'. Recently,
about a month ago, Iset  to myself
flop The impressions are colossal!           
                                          
About the operation of FDD 3.5':                
                                          
  1.Works with disks72Okb and 1,HHmb(with
sealed with a high-density window). Bye
I have not had a single failure on these dis-
kah (NASHUA MF2-DD 72Okb, TDK HD 1, HHmb). 
 2.Although the rotation speed is the same as
 5.25, but reads  in my opinion a little  
faster.                                  
                                          
  3.Disks do not wrinkle or bend (unless
do not bite).                               
  4.Only required +5vfor power.     
  5.I would like to believe that it will be possible soon
new TR-DOSa firmware will appear, I support-
High density mode 1.HHmb        
[OBN: I think this  will not happen, because
case here  not   only  and  not as much
in the firmware.]                              
                                          
  On my PROFI 3+ I only encountered
one problem. Some programs launched
supplied  with  disk drive B, in operation
access drive A. And if you
or 3' to B or C, then cYou won’t be able to
you can run many programs (in particular
most  domestic developments,
having a non-standard format or proprietary
protection!). Yes, and if you suddenly
but drive A fails, you will only need
but it is inconvenient to constantly  execute  command
TR-DOS  A>*"b" for  transition to working
disk drive                                 
                                          
                                          
                                          
  The output is this: you need to install a switch,
so that  you can be  change on disk A FDD
5.25'  or 3.5'. According to the diagram below
on  PROFI  neededтолько один тумблер и три
перемычки.                                
                                          
                                          
                                          
            ╔===╦======╦======╗           
            ║▒▒▒║ ВКЛ. ║ ВЫКЛ.║           
            ╠===╬======╬======╣           
            ║ A ║ 5.25 ║ 3.5  ║           
            ║   ║      ║      ║           
            ║ В ║ 5.25 ║ 5.25 ║           
            ║   ║      ║      ║           
            ║ C ║ 3.5  ║ 5.25 ║           
            ╚===╩======╩======╝           
                                          
                                          

                                          
                                          
                                          
                                          
                                          
                                          
   На многих компьютерах выход на диск вы-
полнен на К1SSЛН2(ЛА13).  В  таких случаях
переключение можно сделать,как показано на
схеме (схема приведена  для SCORPION).    
                                          
   Аналогично  we also proceed in   the case with
PENTAGON. The modification consists of installing
toggle switch, resistance and mikruhi K1SSLPS.
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
                                          
 DDb5 5  4┌--┐  DDb8 5SSLA13         
 -┬---X-----┬--┤LA│6  1┌--┐        
  │  │ 5│ O-----------┤LA│3 A    
  │┌--┐    ├--┤13│          2│  О----    
  └-┤ЛП│    │  └--┘        ┌--┤13│        
    │  ├----┤       MOTOR  │  └--┘        
  ┌-┤ 5│    │       -------┤              
  │ └--┘    │              │13┌--┐        
  │    /    │              └--┤ЛА│11 В    
  ├---/ -┐  │               12│  О----    
 ┌┴┐     │  └-----------------┤13│        
 │ │    -┴-                   └--┘        
 │ │ 10 Ком                               
 └┬┘                                      
  │                                       
  │+5v                                    
                                          
                                          
                                          
                                          
                                          
    По  поводу доработок кsuch a computer
frames like SCORPION, PENTAGON, PROFI, ATM and
etc. you can contact me personally at
Sundays at the Book Market of the city of Sama-
ry (on the territory of the Hippodrome).             
                                          
                           Yudin Igor     
                           St. Zagora 92-34
                                          
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LAST EDITION: 21.05.97                    
MUSIC VU : VISUAL/MS/XTM