Hard - HAYES modem CONNECTION DIAGRAM

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                                      article by SPIRITS company

    Hello bulls, All!!!  Again we decided to bother you
with their pieces of iron.  At the last Gomel point I rose
Question about increasing the speed of the modem.  Some people even
threatened to develop a modem for 14400, but this idea remained
in the heads of points. All the people, after consulting, decided to connect
HAYES modem."What is this for?" - you ask, but for what?
Firstly: plow at 2400 in FIDO and download 1 floppy disk in half an hour -
It's very tedious and can hit your pocket hard. Secondly: in
Everyone wants FIDO.  So we thought... and decided to help, how
We can, with the connection of this HAYES.
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               HAYES modem CONNECTION DIAGRAM                
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    Z80                                  
 ┌────────┐ ┌────────┬────────┐
 │ D0-D7 ├─────────────────────────────────┤ A9-A2 │ D0-D7 │
 ├────────┤ 1┌─────┐3 K555LL1 └────────┴────────┘
 │ A15 ├───┤ 1 ├──┐                                      
 └────────┘ ┌─┤ │ │ K55LL1│2└─────┘ │5┌─────┐6 ┌────────┬────────┐                               
 ┌────────┐ │ └─┤ 1 ├──────┐ ┌──┤ A22,A23│ A9,A8 │    
 │ A14 ├─┘ ┌──────────┤ │ │ │ ├────────┼────────┤                      
 ├────────┤ │ 4└─────┘ └──┼──┤ A24,A25│ A7,A6 │                 
 A13, A12 ├────────┼────────┤                       
 └────────┘ │ ┌─────┐┌──┤ A26,A27│ A5,A4 │          
              │ ┌──┤ 10k ├┘ ├────────┼────────┤                 
              │ +5v ─┘ └─────┘ ┌─┤ A28-A31│ A3-A0 │ 
 ┌────────┐ │ ┌────────┘ ├────────┼────────┤               
 A11-A8 ├───┼──────────────────┘
 ├────────┤ │ К555ЛЕ1 ├────────┤────────┤                
 │ A6 ├───┘ 2┌─────┐1 ┌───┤ B2 │ RES DRV│
 ├────────┤ Gnd ├───┤ 1 ├─────────────┘ ├────────┤────────┤                  
 │ Reset ├─────────┤ │ К555ЛЕ1 ┌──┤ B13 │ IOW │  
 ├────────┤ 3└─────┘5┌─────┐4 │ └────────┴────────┘                
 │ WR ├─────────────────┤ 1 ├──────┘                                              
 ├────────┤ ┌──────────────┤ │                       
 │ RD ├──┼─┐9┌─────┐8 6└─────┘ ┌────────┬────────┐B14 │ IOR │           
 │ OIRD ├──┴───┤ │ K555LE1 ├────────┼────────┤                    
 └────────┘ 10└─────┘ Gnd ├───┤B1,10,31│ Gnd │   
                                            ├────────┼────────┤                 
                                         ┌──┤ B3,B29 │ Vcc │    
                                         │ └────────┴────────┘                
                                                            
                                        +5v                  
----------------------------------------------------------------                                                             
    Address bus layout A0-A15.  In this scheme, decryption
modem is implemented at the addresses: #38BF-#3FBF.  Many modems
+5v power supply is enough, but some may need
voltage of other denominations.   And find out what voltage
necessary, you can look at the modem connector.
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    Well, that's all. Who is interested in this issue or someone
If you are interested in any other information, write to the newspaper POLESIE
or in LISTOK, Kirill Nikushkin (NIKA) and Egor Shavlovsky (ART).
We will try to help you. SPIRITS(c). 6.02.2000
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    INAppendix to "LISTOK21" contains a text file with a diagram for
printouts.
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