Re: Apple II Minus Question

[Rubywand <rubywand@swbell.net>]

Bryan Parkoff writes ...
> 
> Rubywand,
> 
>     Didn't you understand?  I trashed all old 74xxx chips and static RAM
> chips.  Cleaning chip's pin is not worth.  I bought new 74xxx chips and
> static RAM chips from electronic store a month ago.  They are IDENTICAL to
> the OLDEST 74xxx chips and static RAM chips.
>     How do I clean each socket's hole (Not Pin)?
> 
 ....

     Missed the part about chucking all of the 74xxx chips. Usually, that isn't
a good idea. When you do a wholesale swap of so many chips, the chances that a
74xxx on a motherboard is bad are about the same as getting a messed up 'new'
74xxx chip.

     Since you say the computer acts the same, it looks like you lucked out and
got good IC's.

     Does the computer do anything when you press RESET? If not, the RESET
switch may not be working Or the connection between the RESET key and the 6502
RESET pin may be broken (Or, the connection may be shorted to Ground). 

     If pressing RESET doesn't have any effect, try pressing the key several
times quickly-- if the switch is dirty or slightly defective, that may get you
a connect and a RESET.

     BTW, also try doing a CTRL-RESET.

     A quick check for your RESET switch and connecting lines is to use a Volt
meter. With power ON, check to see whether or not pressing RESET causes pin 40
on the 6502 to go to from about 5V (RESET not pressed) to 0V (RESET pressed).



Rubywand