(c) Hard/Witchcraft

                 ࠭窠 DMA UltraSound Card.

                           .

      ᨫ  -  Zx-Pilot  DMA USC.
 ..    ᠭ  㣨  (RUsH#2,ECHO#6, 
Zx-POWER#4  㤥),  ⭮   fido  - , 
 㬠  (       ⮬    ঠ)  ᮧ
让 ࠧ稪  ⥬ "DMA USC-  ⢥".  
, 뫠  訥    ⥬⨪,  
(ᥩ  ) ࠥ    ⢥⠬.   
ࠢ     ।    (᫨        ।
.஢),      ,  㪠    ⮩ .
,   ⮩  ( SPECCY ⮦)   
襩 ⨢!
    ..          ⢥,    ⮡  㡨 ६ 
᪮  ࠭⢮   ਢ 孨 ࠪ⨪ DMA
USC,  ⠪ ⢥  ⨪  Zx-Guide#2  DMA USC, ⨪
 DMA SB.

              孨᪠ ࠪ⨪ DMA USC.

    ᭮,   ⠪ ,   ⠫ ?
᫮ :   4
來 :   8bit
஢ ॣ㫨஢ ஬:   0-63 (6bit)
 ⨧樨 (Rate):   48kHz ( 3.5MHz)
 :   64
Max. 㦨 :    1Mb ( ࠡ⪮ - 16Mb)
- ⥫ ⠩ 뢠:   2
 . ⠩ 뢠:   30Hz-1.75MHz

      ⥮:  i8237A (i8237A-4, i8237A-5, -
181037)  4 ᨬ(!)  , ..  
  ࠡ    ᢮  ⮩ ⨧樨! ⠥, 
奬,  ⮩ 3.5MHz (7MHz  䨪樨  TURBO).
ਭ ࠡ ᭮  אַ 㯥   (Direct Memory
Access  -  DMA).  ஬ ᯨ娢     
ᯮ짮      㣨  楫,  ਬ  ᥫ 
ࠡ     (ldir    襬). 룮 - 4 ⠪ 
(  3.5MHz DMA). 祬   ⮫쪮 ४뢠 
  ६⮬  ,      ६⮬,   ⠪ 
஥  ࠭⢮    ⮬.  ..  DMA  ""  
ࠧ⮥      16(࠭),      64(),   
४뢠      祪   ࠭栬 (
᫮,   室   ).
     DMA USC ᯮ    ⠩  i8253 (i8254,  -
58053). K ⠩     3 , ᥣ 6,   4
९  㪮묨 . ⠫ 2   
ᯮ짮    ᢮  ᬮ७,    祭 뢠
30-1.75. , ஬ ⥫ 뢠 
4 ⥬,  ⨢  砭 , ⠪, 
㤮⢠ ᠭ ஢.
      ⠪,    ந뢠  .mod  ᥣ 1000
⠪⮢ (9000   ).      "+" DMA USC -  
ந뢠  14bit  .wav'   䮭, ..  
᢮  .    ⠪       ࠥ 
६  .




(c) F.R./Witchcraft

                      DMA USC vs DMA SB.

      ᥡ  ࠧ ᢮    (뢠 
)      ALCo  "DMA  Sound  Blaster"    ୠ  ZX
Guide#2.   ஡  ࠧ  "㬠  祭"    
楫ᮮࠧ DMA UltraSound Card.
      ࠧࠡ⪠  DMA  SB  ᭠    ஬ 樨 
୮  ࠡ    ஭   ⥬ "ன⢠ ",
    ७⮬  Covox'    SoundDrive,     .
祬?  ६    ࠪ⨪,   ਢ 
:   ந뢠   .mod    ⮩  ஢  16kHz.
,   Covox( 直 ७ ࠭)ண뢠
.mod    ⠪    ⢮.     狼  TURBO  㤥
    .mod  뢠, ᫨ ,  ᪮७
 ⮬ PENTAGON'   1.5 ࠧ.
    祬     㤮 ᮬ GS?  ⠬ /
    祬    DMA  USC,  ࠬ   
襣.      祭   ⮬,   Speccy  㦭
  ⠪      DMA USC. ,   祬 
⮣  த  512, ⠩, ,...?  ୥
    ""    㤥  .mod'  .wav' ⥫䮭
⢠    Covox'  DMA SB? 筮 , -,  
    娤  ࠤ 譨    
"୮ 㪠".  ⠪ 諮  ६,   業
⢠  ࠡ  DMA  USC 諨 譨  ᫥ 袠
㧮 ᪠: "⢨⥫쭮, SB  㦥!".
     , ALCo : "... ६ ( ᫥ DMA USC) ࠡ
   ᯮ짮   MultiColor    थ  䥪".  
᭮,      ⨬  ⥫ ᪠,    DMA SB 
? ।!!!   类  砥      訡筮! ,
  ࠡ DMA USC   44kHz  ଠ
ᨬ    5-6%.   ଠ  ᥩ  
᢮  ⠫,  ⮬⮬ ࠨ  -
 ᪮ .
        ணࠬ஢ SB   譮,  ⮣, 
  䨪஢  -  16KHz,       ⮣  㦭
१    ᪨  16-192   ᯨ娢    ᥩ
  ᮣ᭮ ஥ ࠭. -,..., ᫮ .
       Speccy ᤥ  ⮣, ⮡  (!).   
⮣   ⮡       १    ஦      ULA  
㭤.

                             .

      㯮  ,    ࠢ  ।
  Zx-Pilot,  ᫨  ஦  । .஢, 
   (   ᯮᮡ):

E-Mail:  witchcraft2001@mail.ru
             witchcraft@ukr.net

Phone:  (06247) 3-35-23, ਩
                           (᫥ 18-00)

ZXNet:  Dmitry Mikhalchenkov 500:562/1.37

Post-Mail:
  85203, ࠨ, 檠 .,
         .ন, .ମ᪠, 18/2
         堫祭 


        ᫠      㪮᭮  ,  ⠪    
஭,  ᪥.  ᪮ ࠭,  ᫨ 
  ᪮  諥       ⮢ 室,  
 ᪮ .
