Re: NES - Apple Sprite card

[Exegete <millers@noneofyourbusiness.com>]

Yves McDonald wrote:
> Roy,
>
> You will find TMS9918A datasheet (in PDF format) at the following 
> address, along with other 8-bit interface chips (ex: 8255):
>
> http://sites.uol.com.br/lsturaro/datasheet.html
>
> I have the databook from TI on that family of video controllers as well 
> but I'm not sure where it is nor if I decided to throw it away when I 
> moved.  I hope I didn't ;-).
>
> Are there any  6502 code samples for that chip?  I'd like to try my card 
> but I want to make sure I have a working program instead of developping 
> software on hardware of unknown state.  I threw away Ciarcia's article 
> on that chip a long time ago.  Dang :-(
>
>
> Thanks,
>
> Yves

I have most of the Bytes ever published. I'll try checking tomorrow, and 
see if I can find the issue in question.

As I recall the databook tells you how to address the VRAM through an 8 
bit port, but I think the only code they use was 9900 code. I do recall 
that the book made it clear that any 8 bit CPU can work with the 9918.

The Coleco ADAM version of CP/M 2.2 came with an editor assembler (I 
suppose the standard DRI programs) but also included information on how 
to program the VDA and it's RAM. However, I no longer have a copy.

Roy

> > My manual on the 9918 is out on loan at the moment, but I thought the 
> > lowest level was a pixel-mapped layer.
> >
> > Certainly, if you did a graphic image in BASIC on either the TI or the 
> > Coleco, sprites were never used. The ADAM's BASIC had exactly the same 
> > commands as AppleSoft, so that any graphics work done in AppleSoft 
> > (that didn't use Peeks or Pokes of course) could be done on the ADAM.
> >
> > Many a time I typed in Apple programs from Family Computing on my ADAM 
> > and had they look exactly the same as the picture of the Apple 
> > version. Or, if machine lanugage was used, the same program with 
> > different data statements.
> >
> > Roy



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