Newbrain Signals

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  • 9 August 2024 at 4:13 pm #3331
    CDesp
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      MainBoard 2

      Some signals to check if you have a non working computer

      IC432 pin 10 is 1/8c thats 4MHz

      IC439 pin 4  is 1/16c thats 8MHz

      IC441 pin 8 is nCKVSR thats 8MHz on low res screen OR 16MHz on hi res (open#0,0,”L”)

      IC441 pin 6 is nVDLD thats 8MHz

      IC432 pin 6 is nCOPINT every 13ms

      IC422 pin 9 is nTVL every 20ms

      IC422 pin 1 is nFRMR every 20ms

       

       

       

       

      • This topic was modified 1 year, 8 months ago by CDesp.
      • This topic was modified 1 year, 8 months ago by CDesp.
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      • 9 August 2024 at 4:25 pm #3332
        CDesp
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          IC450 pin 4 nFRM

          nFRM

          IC461 pin 1 nRSTFRM

          IC463 pin 3 t141 to FP

          IC471 pin 12 FP

          SB_IC418 pin3 nTVRQP

           

          SB_IC419 pin3 TVAD

          SB_IC419 pin6 nCPQRG

          SB_IC420 pin11 TVCLK

          SB_IC422 pin6 TVSD

          SB_IC423 pin3 nBUSRQ

          • This reply was modified 1 year, 8 months ago by CDesp.
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