[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: NES - Apple Sprite card
- Subject: Re: NES - Apple Sprite card
- From: mjmahon@aol.com (Michael J. Mahon)
- Date: 21 Nov 2002 20:28:54 GMT
- Newsgroups: comp.sys.apple2
- Organization: AOL http://www.aol.com
- References: <r68D9.8060$kS3.1082056@news20.bellglobal.com>
- Xref: archiver1.google.com comp.sys.apple2:24751
Yves McDonald wrote:
>I think the paper about the sprite card was published in Byte issue on
>LOGO language (circa 1982).
>
>There are code samples in TI 9900 assembly language in TI books indeed.
> From the chip count on the sprite card, the 9918A interfaces nicely
>to the Apple bus.
Yes, it interfaces very easily, though the actual decoding on this card
is somewhat peculiar.
The card also contains a 2516 EPROM which contains 6502 firmware
used by Sprite Logo to control the card. I glanced at it, but have not
done much disassembly.
The TMS9918A was also used in the MSX computers, and that is a
good place to go for more information on the chip:
http://www.msxnet.org/tech/
After seeing how reticulated the 9918 is to control, I admit that my
interest flagged somewhat. But that can be remedied by writing a
set of low-level drivers to provide a more "natural" programming
interface.
I'd be very interested in any software that used this card.
-michael
Check out 8-bit Apple sound that will amaze you on my
Home page: http://members.aol.com/MJMahon/