Re: Apple II Minus Question

["Bryan Parkoff" <bryan.nospam.parkoff@nospam.com>]

Hello,
> >Inserting IC's into the sockets creates a friction that cleans and almost
> >scrapes the contacts. It's the only way I know to clean sockets. You've
> >replaced the RAM and 74xxx series IC's, so I'd try swapping out more,
like
> >the CPU, and anything else you can find. It might not be an IC but a
> >component like a blown cap, or maybe even a bad solderpoint. Check over
all
> >solder spots with a magnifying glass. Look for cracks in the solder.
    I have tried all the procedures that you suggested.  All 74xxxx chips,
RAM chips, ROM chips and CPU chips are working fine on other Apple II
motherboards.  They are in fair condition.  I suspect that motherboard is
very bad, but it is in a VERY GOOD CONDITION.  Didn't it make sense?  It has
to do with resistors, capicators, and other electronic parts including
broken traces.
>
> A ][+ (please, there is no such thing as a "minus"), once
> stopped displaying color because the crystal went out of
> spec.
    It is OKAY for me to say "Apple II Minus" or "Original Apple II".  It is
not really Apple II Plus.  I do understand that there is no such label that
says "Apple II Minus".  It always says "Apple II"  It helps us to recognize
"Apple II Minus" and "Apple II Plus" rather than "Apple II" and "Apple II
Plus".

> As you have observed, the Apple ][ does not have a hardware
> reset (unless a Disk ][ controller is present), and must be
> manually reset to get into the monitor.
    Can you explain, "Apple II Minus does not have RESET hardware?"  Do you
mean that 6502 CPU does have RESET built in, but Apple II's keyboard has
RESET key while it is not WIRED to 6502 CPU?  It is why RESET key is not
working that is never hooked up to 6502 CPU.  Does it mean that everyone
owns Apple II Minus must always turn off and on power every time to reboot
Apple II Minus?

    I turned on Apple II Minus before HGR is turned on with both 12 black
and white horizontal lines in the screen.  No assembly prompt, Integer /
AppleSoft BASIC prompts are shown.  I tried to hold and press CTRL-B keys to
return to Integer BASIC from Old Monitor Routines, but nothing is working.

    Is it true that AutoStart Monitor Routine and Old Monitor Routine zeroes
"FF FF FF FF" in each even page and "00 00 00 00" in each old page?  Or...Is
it the way how RAM chip zeroes "FF FF FF FF" and "00 00 00 00" in both
even/odd pages before power is turned on?  It is impossible to show garbage
characters in each RAM chips.  On unenhanced Apple //e has "FF FF FF FF" and
"00 00 00 00" in both even/odd pages, but it NEVER has any garbage
characters unlike Apple II does.  I don't know if it is true that it is done
to z�K�by neither RAM chip or Monitor Routines.

--
Bryan Parkoff