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      參數(shù)資料
      型號(hào): TP6508
      英文描述: Pushbutton Switch; Actuator Diameter:0.078&quot;; Circuitry:6PDT; Switch Operation:6 Changeover Push-Push; Contact Current Max:100mA; Leaded Process Compatible:Yes; Mounting Type:PCB; Switch Function:6PDT
      中文描述: 顯卡
      文件頁數(shù): 45/134頁
      文件大?。?/td> 600K
      代理商: TP6508
      P.42
      VII. Registers Description
      TP6508 contain seven groups of registers . These are IBM Standard Register Backward
      Compatible Register , Extended Sequencer Register , Extended CRTC Register , Panel Control
      Register , PCI Local Bus Configuration Register, Graphics Engine Register.
      IBM Standard Register
      There are five sets of registers in the video subsystem. All but the system microprocessor data latches and the
      attribute address flip-flop are readable. The following figure lists the registers and the I/O address where they are
      located. The figure also lists whether or not they are read/write, read-only, or write-only.
      * General Registers
      Misc. Output Register ( MISCREG: R/3CCH, W/3C2H )
      D0
      I/O address select ( 0/3BXH, 1/3DXH )
      D1
      Enable video RAM ( active high, no effect on display refresh )
      D2
      Clock select 0 ( 00/25MHz, 01/28MHz )
      D3
      Clock selcet 1 ( 10/auxi., 11/45MHz )
      D4
      Reserved
      D5
      Odd/Even page select ( for diagonostic use )
      D6
      Horizontal sync. polarity select ( 0/positive, 1/negative)
      D7
      Vertical sync. polarity select ( 0/positive, 1/negative)
      Input Status Register 0 ( INSTREG0 : R/3C2H )
      D0-3
      Reserved
      D4
      Switch sense bit (match with clock select 0/1 )
      D5-6
      Reserved (0)
      D7
      CRT interrupt ( 0/cleared, 1/pending )
      Input Status Register 1 ( INSTREG1 : R/3AH )
      D0
      Display enable ( active low )
      D1-2
      Reserved
      D3
      Vertical retrace (VGA) /CG out (Herculus)
      D4
      Color plane register check 0 ( P0, P4, P1, P6 )
      D5
      Color plane register check 1 ( P2, P5, P3, P7 )
      D6-7
      Reserved
      Feature Control registe ( FEATREG: R/3CAH, W/3AH )
      D0-7
      Reserved
      VGA DAC I/O Ports
      3C6H
      3C7H
      3C7H
      3C8H
      3C9H
      Pixel mask register
      DAC state register ( read only, VGA support D0-D1 )
      Look-up table read index ( write only, RAMDAC support )
      Look-up table write index
      Look-up table data register
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