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Apple II- Repair

Apple II- Repair

    I am looking for the information on the web site that it has an original
Apple II mainboard reference.  I have suspected that mainboard does not
operate properly after the power supply is turned on.  It displays in the
screen that it shows the character blocks.  Nothing work like reset, ctrl-b,
etc.
    It may be possible that some IC chips are bad.  Is it possible that I
can purchase new IC chip that reads 74LS11N at the electronic store.  It
might solve the problem in order to bring mainboard back to normal.  Please
advise.

--
Yours Truly,

Bryan Parkoff
BParkoff@satx.rr.com