Re: In pursuit of Dead Wild Cat

I'm using a variant on that page's square table method for my 10 bit multiplies (though I always do (a + b)^2 - (a - b)^2), and something a lot like his divide. But my divide is a lot messier. Specifically (in pyz80 syntax): ; ; FIXDIV, works out BC / DE and stores it to HL (all 8.8 f

Re: In pursuit of Dead Wild Cat

Thanks for Sharing Ellvis ! Edwin - Original Message - From: "ellvis" <[EMAIL PROTECTED]> To: Sent: Monday, May 19, 2008 9:00 AM Subject: Re: In pursuit of Dead Wild Cat Hi, I am not really a coder, but you can always try to look at http://baze.au.com/misc/z80

Re: In pursuit of Dead Wild Cat

Hi, I am not really a coder, but you can always try to look at http://baze.au.com/misc/z80bits.html It's a collection of z80 math routines, all commented, it's done by Baze/3SC - Spectrum demo coder. Just for an inspiration. Anyway, it's really great to read such a stuff here on the list, pr

Re: In pursuit of Dead Wild Cat

Re: code, I really don't think that cycle pinching is the main problem — I think it's algorithmic. I'm going to need to think about that a bit more. At the minute I'm a bit indoctrinated as to how I think a 3d pipeline should go, and I may need to rethink that. Sometimes you have to take th

Re: In pursuit of Dead Wild Cat

Oh, I idiotically didn't close SIM Coupe before throwing the DSK file at my FTP program. Sorry! Re: code, I really don't think that cycle pinching is the main problem — I think it's algorithmic. I'm going to need to think about that a bit more. At the minute I'm a bit indoctrinated as to ho

Re: In pursuit of Dead Wild Cat

Thomas Harte wrote: It's originally on Fred 50, but not really in the sense that you have to expand it to another floppy disk and then boot it off that. But, here, I'll save you the effort of all that: http://members.allegro.cc/ThomasHarte/temp/DWC.DSK This appears to be a blank disc image w

Re: In pursuit of Dead Wild Cat

On Fri, 16 May 2008 19:45:02 +0200, Thomas Harte <[EMAIL PROTECTED]> wrote: Yep, I think I'm on approximately 2000 cycles for every divide. The 16x16 multiply uses no tables whatsoever and costs between 700 and 1200 cycles depending on RAM timings. From memroy I believe I once had a 16-b

RE: In pursuit of Dead Wild Cat

If i remember correctly alot of divides in 3d systems on older platforms can actually be a nice big table ;) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Edwin Blink Sent: 16 May 2008 22:00 To: Adrian Subject: Re: In pursuit of Dead Wild Cat From

Re: In pursuit of Dead Wild Cat

It's originally on Fred 50, but not really in the sense that you have to expand it to another floppy disk and then boot it off that. But, here, I'll save you the effort of all that: http://members.allegro.cc/ThomasHarte/temp/DWC.DSK The more I watch it, the more I become convinced that it's

Re: In pursuit of Dead Wild Cat

From: "Thomas Harte" ... dead wild cat demo ... I'm don't remember this demo Where can it be found ? BTW If you need some help with optimizing your (multiply/devide) code. I'm always in for some byte/T-state banging :-) Edwin

Re: In pursuit of Dead Wild Cat

utine costs 2000 cycles is this each time you divide? How fast is the multiply routine? Dave - Original Message - From: "Thomas Harte" <[EMAIL PROTECTED] > To: Sent: Thursday, May 15, 2008 10:48 PM Subject: In pursuit of Dead Wild Cat As I previously said, and as me

Re: In pursuit of Dead Wild Cat

t; <[EMAIL PROTECTED]> To: Sent: Thursday, May 15, 2008 10:48 PM Subject: In pursuit of Dead Wild Cat As I previously said, and as mentioned in the current Sam Revival, I'm experimenting with 3d on the Sam. At the minute I'm just playing with vector graphics, since they move reasonab

Re: In pursuit of Dead Wild Cat

In fairness, I'm not completely comparing like for like in that video. I am doing realistic 3d engine stuff of creating one view matrix to represent the orientation and location of the camera, a separate transformation matrix to represent the orientation and location of the model, then composing t

Re: In pursuit of Dead Wild Cat

Thomas wrote: > I'm not doing too terribly (see > http://www.youtube.com/watch?v=hcMiB1ZkukM > for my attempt at a Cobra Mk 3 versus the Spectrum original), Great work! > Dead Wild Cat Never looked at the disassembly of that, but can remember the distorted perspective when it was running.

In pursuit of Dead Wild Cat

As I previously said, and as mentioned in the current Sam Revival, I'm experimenting with 3d on the Sam. At the minute I'm just playing with vector graphics, since they move reasonably quickly, making it easy to observe problems with the algorithms. I'm not doing too terribly (see http://ww