[Coco] Wolfenstein 3-D on a 4.77mhz 8088? So, 6809 port, anyone?

[L. Curtis Boyle]

I don't know if it would be completely impossible. While the 8088 PC's did have DMA and hardware divide, their instruction set (especially with memory accesses) could be quite a bit slower than a 6809 (or especially a 6309). Also, note that in that demo, they were using a Sound Blaster for the sound, which would mean a lot less CPU overhead then trying to do it with just the 6809. And, lastly, they are using a very small viewing window (to even get it to the speed that they do have), which appears to be about 1/3 the horizontal resolution, and 1/4 the vertical resolution. Since Wolfenstein was a 320x200 game, that would mean about 106x50 resolution (for the actual 3D rendering).
And, finally, some proof that this has already been done (graphically as a demo, anyways):
http://www.youtube.com/watch?v=W-Ba2X_AZrI


L. Curtis Boyle
curtisboyle at sasktel.net



On Apr 23, 2013, at 10:39 PM, Allen Huffman wrote:

> On Apr 23, 2013, at 11:40 PM, Steve Bjork <6809er at srbsoftware.com> wrote:
> 
>> The 6809 is only has an 8-bit ALU but the 8088 has 16-bit ALU. Math is more limited on the 6809 because the lack of the DIV instruction.  The 8088 also had block memory move instructions. Add the fact that most IBM system came with hardware DMA for fast memory moves, the CoCo just can't keep up.
> 
> Well heck. So there was something the 8088s could do. I used to run CoCo BASIC versus the same thing on DOS BASIC when I worked at Radio Shack (88-90), and it took the 286 model Tandy 1000s to be faster than the CoCo 3.
> 
> Okay, we can stick to Z80 stuff like Donkey Kong.
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