Re: A86: Re: Re: Re: BG v1.0 grayscale converter is out !

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Re: A86: Re: Re: Re: BG v1.0 grayscale converter is out !


just output ((PAGE)|0x40) to port 5 and ((PAGE+1)|0x40) to port 6. then
you can get 32KB. but you can get even more if you try :)

Matt2000 wrote:
> 
> >>When you get the free time? Heheh, you say that like it is easy. Are you
> >>really that good? The two true 3d games I know of
> >>is Daedalus (Andreas Ess) and Labby (Jimmy Mardell). I dont even know if
> >>labby is truely 3d like Daedulus, but these guys are the best (top 5) Z80
> >>programmers around.. Are you taking a 3D algorithmic class in college
> right
> >>now?
> >
> >Labby is just fake 3d which is obvious when playing it. All lines
> >are (of course) precalculated. The actual 3d engine (without enemies)
> >took only about 700 bytes (that was Labby 1.0) which also was my
> >first ZShell game ever.
> >
> >I believe it's very hard to make Daedalus faster; it might be possible
> >on the 86 using a BIG part of the memory (like 64k...) for multiplication
> >lookup tables.
> 
> You could use a pre-calculated Lookup table for the PutPixel routine for any
> memory address, suitable for grayscale.
> You could use an ultra fast IM 2 interrupt handler for grayscale (see
> gray.asm attached by Dux earlier). Thats your
> interrupt handler we derived that from Jimmy, remember (the Down-Left bug
> fix message a few months back)
> 
> We can access massive memory with an idea I thought of earlier ---- (Heheh!)
> 
> Reserve a 64K string, determine the start of the variable data, load $4000
> into that RAM page and $8000 into the next RAM page, INC page on $4000 and
> INC page on $8000 whenever $8000 is reached, reset counter back to $4000 and
> begin
> reading memory again. Understand what I am talking about? Linear memory
> access of multiple pages without use of
> Absolute addresses. I havent got a working program yet, but hell, summer is
> here! Cool stuff shall be coming from me
> fairly soon!
> 
> Later
>     Matt

-- 

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=   Kirk Meyer (mailto:_@ibm.net)   =
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