M. Pender wrote:
On 3/10/04 6:21 PM, in article WpN3c.135$i76.3008@attbi_s03, "Vince Briel" <vbrielnospamme@comcast.net> wrote:Daryl Rictor has come up with a low profile 65816 to 6502 adapter that should work on the Apple II series computers. These boards are not tested but other people have done tests to get the idea working. The board is about the same size as the 6502 so there are no worries about space requirements. Check his website for more details. Also the 6502.org thread about this project. Imagine running a 65816 on a II+ or IIe! Volunteers are needed so check it out. Daryl's web site information on this: http://65c02.tripod.com/conv.html 6502.org discussion thread: http://www.6502.org/forum/viewtopic.php?t=186&postdays=0&postorder=asc&start =0 What do you guys think?I'm not clear on the goal of the project. If the goal is to run IIgs software on a IIc/e then replacing the 8-bit 6502 with a 16-bit 65816 won'taccomplish that.If the goal is to enable the IIc/e to use the broader instruction set available to the 65816, then its much easier to install a 65c802 in place ofthe 65c02.
And where does one obtain a 65c802 these days? Western doesn't even mention it on their web site. So, one goal of the project would be to accomplish just what you used to do that can no longer be done.
I used to do that with my Laser 128--there are even macro files
for Merlin and the Macrosparc assembler floating around (Asimov?) that I wrote to allow access to the broader instruction set. Note also that the timing of the 6502 is slightly different than the 65c02/65c802/65816. Thus, the 65c02 is not a drop-in replacement for the 6502 on the Apple II or II+ -- IIRC it has something to do with the RDY line.
However, the Transwarp, if memory serves, works with the IIPlus, and it used a 65c02, so the project could deal with that as well.
For me, the best idea though, would be a 65816 based neoTranswarp Card, one with far more than 256K on it, so that large "late" ProDOS programs, like AppleWorks 5 could be running at speeds of 14-20 mhz. Now, that's an "Enhanced" IIe!
Roy
- Mike
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