Iron - modification of the #FD port in Scorpion 256.

 DORBOTS                 
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   Today we dedicate this section
 computer 'SCORPION ZS-256'. Overall this
 not a bad computer, but due to its faulty
 decryption of port #FD on this machine
 the bus does not work, many very good ones
 programs such as TASM, STS, INSULT
 MEGADAMO, MEGASOOON and many, many others
 gie... But through the efforts of Dmitry Grachev this
 the problem was successfully resolved. They were
 a decryption scheme for port #FD has been developed,
 who still works for his ma-
 tire.  Let's not go into details and
 describe the operation of the circuit, who needs it themselves
 they'll figure it out.                              
                                          
 Order of modification      
                                          
 1.Cut off legs 2 and 6 of the D53 chip.    
                                          
 2. Pull leg 6 to +5V through a resistor
   nominal 10kOhm.                       
                                          
 3. Place 2 D53 signal chips on your leg
   from our diagram.                         
                                          
   The figure shows the modification scheme and
 a piece of the board with an image of the location
 denning chipD53. After the
 modifications will make all programs work for you,
 using incomplete addressing when transferring
 Switching memory pages (OUT (#FD),A
 instead of LD BC,#7FFD ; OUT(C),A).        
                                          
 GOOD LUCK TO YOU AND WE ARE EXPECTING NEW DEVELOPMENTS FROM YOU!