Re: Auxilary Ram card programming info..

[Phoenyx <quazar@dcnet2000.com>]

Matt Jenkins wrote:
> That'd be cool. Is Merlin available for free to download now? I'm 
> stuck for a decent assembler to use.

There is a version of Merlin on Asimov I think.

> To be honest, I don't really care about compatibility with other
> ram expansions - the AE approach interests me, since it's the
> most flexible. If someone *really* wants to play with what I come
> up with, then a RamWorks/Z-Ram or compatible board shouldn't be
> that hard to find.

The AE method was used by other cards I think.

> The interrupts aren't that tricky, all you have to do is provide
> a handler. Interrupt-driven devices are actually pretty rare in
> the Apple II; apart from the mouse card, there isn't much else
> that actually generates an interrupt, and since I plan to utilize
> the mouse's interrupt generator I'm trapping it anyway, and it's
> fairly simple to trap in aux. memory and use a handler to
> communicate the as yet unclaimed interrupt back to ProDOS (which
> no doubt, will have no handler for it and bring the system to a
> halt :\))

Actually, Prodos does have an internal interrupt handler, even
though the number of interrupt devices are rare.

> It would be great if you could beta test, presuming you've got the
> hardware.

Sure, just let me know when you have something ready. I have a IIe
and IIc with an AE card.

-- 

Cheers and best wishes,
Phoenyx

Have you fed your Apple today?

Phoenyx's Pages are back online...

It seems the ZIP.TO link was down for a while.
It is now working again. This is the preferred
link to my site. You may also use the direct link.

http://zip.to/Phoenyx_A2
http://www.tinyangeldesigns.com/Apple2