Newbrain Signals

[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 month ago by CDesp.
• This topic was modified 1 month ago by CDesp.

[CDesp]

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IC450 pin 4 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 month ago by CDesp.

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