Re: Later Apple II Technical Manuals

["Great Hierophant" <great_hierophant@hotmail.com>]

There is another minor change between the Enhanced IIe and the Platinum
IIe boards, there is only one ROM in the Platinum IIe as opposed to the
two ROMs in the Enhanced IIe.  One less chip or circuit for
multiplexing.

Scott Alfter wrote:
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> In article <Mymjf.17$rn1.112@news.oracle.com>,
> Martin Doherty  <martin.doherty@undisclosed.com> wrote:
> >Great Hierophant wrote:
> >>I just bought an Apple IIe Reference Manual, dated to 1985, so I'm not
> >>sure whether it covers the enhancements in the Apple IIe design.
> >
> >I think it probably would cover the Enhanced //e by that date (2 -3
> >years after //e first released), an easy way to check would be to see if
> >it covers MouseText characters which were introduced with the Enhanced.
>
> I have that manual, and it does cover the enhanced IIe.  The included
> schematic covers the original board layout, which used eight 64Kx1 DRAM
> chips.  My understanding of the last IIes (having never seen inside one
> myself) is that the motherboard was redesigned to use two 64Kx4 chips
> instead.  That change wouldn't be in the 1985 edition of the tech reference,
> but as far as writing software and designing add-on hardware goes, it
> wouldn't make any difference.
>
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