Re: 65C816 adapter for 6502 computers (aka Apple II)

["Vince Briel" <vbrielnospamme@comcast.net>]

"Bryan Parkoff" <bryan.nospam.parkoff@nospam.com> wrote in message
news:eZN3c.19007$u53.1941@fe1.texas.rr.com...
> Ouch!!
>     I am sorry to state.  Unfortunately, 65816 CPU will NOT WORK on Apple
> II+ nor Apple //e because 65816 CPU's and 6502 CPU's timing are not EXACT
> the same.  They have different nanosecond measurement.  For example, 6502
> CPU requires 400 ns to run while 65816 CPU runs 250 ns (I can't remember
> exactly.)

This circuit takes care of the times and the bus contention problems.

>     "Understanding an Apple //e" manual stated that someone tried to plug
> 65C02 CPU into Apple II+, but very several instructions work while often
it
> crashes at all times.

I've swapped them no problems.

Vince



--
Replica I
The Apple I clone

http://www.applefritter.com/apple1/members/replica1/index.htm