Re: JACE: Finally usable for a change

[vladitx <vladitx@nucleusys.com>]

On Jan 30, 6:13 am, Sheldon Simms <wsspa...@gmail.com> wrote:
> On 2011-01-27 17:59:43 -0500, mmphosis said:
>
>
>
> > ORG $0300:
> >     LDA $C050 ; 4 cycles
> >     NOP ; 2 cycles
> >     LDA $C051 ; 4 cycles
> >     JMP $0300 ; 3 cycles
>
> > Note that 13 cycles is what makes the video "lock in" work.
>
> When I try this code on my IIe, I get a doubled 80-column letter in the last
> microsecond before the Lores starts. Looking at "Understanding the
> Apple IIe" I think I understand how/why this can occur.
>
> My question is, does this happen on the Apple II/II+? I suspect not, but
> am I wrong?

I believe that on the Apple ][ you should get something like this:

http://www.softjunk.org/sw/apple2/ra2/files/screenshot/test4-ra2.jpg

I did this simulation with respect to the schematics.