Re: Apple schematics

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <21346.678.uupcb@yob.com>,
Jeff Brielmaier <jeff.brielmaier@yob.com> wrote:
> 
> PC>: Hello, I'm looking for logic board's schematics for any apple model,
> PC>: could anybody help me, I will apreciate your help
> PC>
> PC>The first manuals that came with the Apple included the logic board
> PC>schematics.  Not sure about the //e, but I know my ][+ manual had it.
> PC>I don't have it anymore, but if you can find one, they'll probably give
> PC>it away.  Or, some place like Alltech might have a few copies left to sell.
> 
> Up until the release of the IIgs, the Technical Reference manuals
> included the schematic for the machine (did Apple publish the IIgs
> schematic?). 

Yes.  They published the schematic for all Apple II models (though
some motherboard revisions may not have made it into the manuals),
including the ][ (revision 7 at least), //e, //c, //c+ and IIgs
(original and 1MB motherboards).  I haven't seen the second edition
IIe technical reference for a long time, so I can't remember if the
schematic for the platinum IIe motherboard was included in there.  I
expect it was.

Apple also published ROM listings (with the exception of Applesoft
BASIC) for the ][, ][+, //e and //c, but not the //c+ or IIgs.

> Of course, the Apple ][/][+ was the last machine that was made out of discret 
> components so that someone could actually watch what was really happening <g>

Yep.  The IIe and IIc uses ASICs (IOU and MMU) to combine a lot of
logic from the ][+, and the IIgs has a lot more of them.


-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand