Iron - Digital sound on Speccy. Coxox 8b.

╔═══════════════════ ════════════════════╗ 
|      Digital sound on Speccy...  | 
╚═══════════════════ ════════════════════╝ 
 Lynx/Infotek                            
                            
 This article is intended for those who 
loves specs and high-quality digitized 
music. We will talk about working with non- 
how much non-standard for the performance of music. on- 
collar - Coxox 8b. But then at the same time 
It's quite common these days.     
  Covox 8b is loaded onto the port (already decrypted 
bathroom in some computers) LPT(#FB), 
i.e. printer port.                       
  The considered COVOX is 8-bit 
DAC (digital-to-analog converter) 
lem). At this time, many game and demo... 
makers for producing digitized sounds 
they use exactly this bells and whistles. For example, 
dema OVER THE TOP.                        
  So, here is the 8V Covox circuit:             
                                          
           R1                             
  C D7 *--###----+--+----*               
  e R1 R2# = C1 To input        
  n D6 *--###----+ ++----* amplifier.t        R1   R2# +    (ватт на 1OO)    
  r  D5 *--###----+                       
  о        R1     # R2                    
  n  D4 *--###----+                       
  i        R1     # R2                    
  x  D3 *--###----+                       
           R1     # R2                    
     D2 *--###----+                       
           R1     # R2                    
     D1 *--###----+                       
           R1     # R2                    
     DO *--###----+                       
                  # R1                    
                  |                       
                  +                       
                                          
     R1 - 7,5 кОм.                        
     R2 - 2*R1=15 кОм                     
     C1 - 68OO пФ                         
                                          
  Для ковокса есть следуюший софт (из то- 
го, который я знаю). Этот софт можно ска- 
чать с моей BBS'ки на C-DOS'ах.           
                                          
  DSCv1.OO  -  компилер  модулей  Digital 
               Studio под Covox.DSC - Digital Studio version itself 
          Covox.                          
PlayMod - player of .MOD files for Covox. 
 Covox - Covox diagram and test.           
                                   
                  * * *                   
                                          
    Well, that's about all I know. Under 
at the end I will give a small algorithm for playing - 
.wav files for covox:              
                                          
           ld hl,wav : file address   
           ld bc,(wav+4) :length          
      L1 ld a,(hl)                     
           out (#FB),a                    
           dec bc                         
           inc hl                         
           ld d,xxx :delay            
      L2 dec d                          
           jr nz,L2                      
           ld a,b                        
           og c                          
           jr nz,L1                      
           ret                            
                                          
 Now about the delays:                  
Well, that's about all I know. Under 
at the end I will give a small algorithm for playing - 
.wav files for covox:              
                                          
           ld hl,wav : file address   
           ld bc,(wav+4) :length          
      L1 ld a,(hl)                     
           out (#FB),a                    
           dec bc                         
           inc hl                         
           ld d,xxx :delay            
      L2 dec d                          
           jr nz,L2                      
           ld a,b                        
           og c                          
           jr nz,L1                      
           ret                            
                                          
 Now about the delays:                  
 6 - for 22 kHz:                  
        17 - for 11 kHz:                  
        26 - for 8 kHz.                  
                                          
    Enjoy your sound (under covox).