Re: My Apple ][+ is now very, very sad...

[John <john8520@gmail.com>]

Alrighty. I did some googling, found the "Understanding the Apple ]['
PDF, downloaded it. I haven't read it much yet, but the board layout
has proved infinately usefull. I spent a bit of time with a speadsheet
and a Mouser window open, and it looks like I can replace every single
74LS chip in the ][+ (there are 41 of them) for a mere $28.47, plus
about $6 shipping. Not bad, and it probably would help the machine's
longevity if I replaced them all anyways.

Time to read that PDF and learn some about Apple ][ goodness!

John

On Jul 14, 5:59 pm, Linards Ticmanis <ticma...@gmx.de> wrote:
> John wrote:
> > Thanks for the info, that is very good to know! I do have a schematic
> > (its for the ][, but isn't the ][+ the same?), but no circuit
> > description, so I'll look for the PDF of that book. I have tried GR
> > and HGR modes, but not HGR2, and they show the same results. My book
> > 'APPLE ][ Refrence Manual' has quite a bit of usefull info in it that
> > should be able to point me to what chips do what, where they are,
> > etc.
>
> Yes the schematic is the same.
>
> The UAII book is far more thorough in describing HOW the circuits in the
> Apple actually work, rather than just what results they achieve. If you
> read it, you will pretty much understand what is the job of every
> electron moving around in the machine (with the exception of the inner
> workings of the CPU). Really a great reference.
>
> > I wish I had a digital copy (or ANY copy for that matter) of the board
> > layout. That way I could check off what chips are what, and if
> > replacing/swapping did any good, as well as I could know what chip
> > occurs where, which makes finding them loads faster.
>
> Such a thing is found at the very end of the above-mentioned book ;-)
>
> (Confession: I was the person who scanned it and uploaded it originally.
> Thus consider all of this a plug, but an honest one. ;-)
>
> --
> Linards Ticmanis