Re: Are there any 65816 card schematics?

[Tristan Mumford <xtristan.xmumford@xgmail.xcom>]

Alex Freed wrote:

> "Tristan Mumford" <xtristan.xmumford@xgmail.xcom> wrote in message
> news:4595d39b$0$68952$c30e37c6@lon-reader.news.telstra.net...
>>
>> The extra maximum speed of the '816 doesn't matter to me. It was just
>> going
>> to run at the system speed. It's the extra address space and opcodes that
>> interest me.
> 
> For the extra opcodes the easiest solution by far is a 65C802 CPU which is
> pin compatible with the good old 6502. Just plug it in.

Yeah, they're good that way. I believe the '816 can sort of be plugged in
like that too. Except it's pointless and the whole phi2 A16-23 on the
databus upsets things a bit too.
> 
> You don't get the extra address space this way. For that you do need to
> make a board with extra memory. Not too hard is you are happy with 1 MHz.

That was my reason for wanting to use the '816. Sure I could do a banked
memory setup but I would really like to use that CPU.
Adding the extra RAM isn't too hard. I was considering either seeing if I
have some big SRAMS lying around, or just using 30pin simms (don't worry, I
have a few ideas how to make a non-invasive refresh scheme for them.).

I'm more than happy with 1MHz.


> 
> -Alex.

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