Re: Why did Woz use the long cycle?

[jonnosan <jonnosan@gmail.com>]

On Apr 10, 1:07 am, "Bryan Parkoff" <nos...@nospam.com> wrote:
> > VA already toggles every line.  It counts just as /HPE is asserted, and
> > then holds it's own value as the horizontal counter is preset.  VA isn't
> > preset when vertical preload occurs, but since there is an even number of
> > vertical cycles, it doesn't need to be preset at that point, either.
>
> > Jim Salter's schematic in his book is mistaken when it connects /HPE to VA
> > and the VA preset line.  /HPE is not connected to either.
>
>     Are you sure that it is Understanding Apple II+ book?  Which page did
> Jim Sather make mistake to connect HPE to VA.
>
> Bryan Parkoff

Here's the schematic
http://victa.jamtronix.com/display/page/4130