Re: Apple II+ Flakey Inverse Characters

[wrodiger <wrodiger@gmail.com>]

On Jan 10, 10:09 am, mwillegal <m...@willegal.net> wrote:
> That part should work in a RFI board, though it is interesting that an
> EPROM would fail in a very similar way to a 2513.
>
> Regards,
> Mike Willegal
>
> On Jan 8, 10:50 pm, wrodiger <wrodi...@gmail.com> wrote:
>
>
>
> > On Jan 8, 4:20 pm, mwillegal <m...@willegal.net> wrote:
>
> > > I think that you are on the right track.
>
> > > A flakey 2513 was my first guess, but you indicated that it only
> > > happened
> > > in inverse mode.  This problem should not be dependant upon mode,
> > > though it
> > > may be more obvious in certain modes. I had a batch of NOS 2513 chips
> > > where
> > > about 50% of them had this issue.
>
> > > Regards,
> > > Mike Willegal
>
> > > PS
> > > the 341-0036 character rom part listed on the site you mention is not
> > > a 2513 and is not compatible
> > > with early Apple II motherboards.
>
> > My motherboard is a revision 7 RFI board, so I am hoping it matches...
> > if not, I assume I can locate the binary image and burn my own?
>
> > Will

Bingo! Works like the day it was shipped!

Damn, the Apple II is a beautiful thing... how many computers out
there can you troubleshoot in an hour with the documentation supplied
with it (reference manual circuit diagrams), pull and replace a
socketed chip, and be back in business?

The keyboard has come back to life too!!!

Long live the Apple II!

Will