Hard Group - Upgrading Pentagon 128k to 512k.

                                          
                                          
      ДОРАБОТКА ПЕНТАГОН-128 ДО 512К      
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 Necessary changes:                   
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 Replace all PYS with RU7                  
 Out1 - to KP11 instead of A9                 
 R9 - to the 1st terminals of all RU7s          
 Instead of B14 (at KP11), apply GND          
 Swap places on KP11:                
                B11 and C35,                
                 A8 and C34                 
                                          
 Connection points to com. "Pentagon-128": 
 ---------------------------------------  
 CS7FFD - 13 DDbCh C35 - 13 DD17  
 CSPAGE - 6 DDbЗ A8 - 2 DD18    
 A9 - 5 DD18 C34 - 13 DD19  
 В14 - 5 DD16 С14 - 3 DDЧ5   
 B11 - 2 DD16 C23 - 5 DD15   
                                          
The address bus is shown as A1-A16!        
These seem to be designations according to the V.M.G. scheme. 
                                          
Best wishes.                           
Best regards,        Roman Milukov 
                  ZX_Server (2:465/98.17)