Re: ISA Vector card already done...

On Tue, 24 Mar 1998 17:02:56 -0800, Clay Cowgill <ClayC@diamondmm.com> wrote:

>...well, sorta. ;-)
>
>http://www.rtsys.com/rt02003.htm
>
>Has basically what I've been talking about. (an ADSP-2181 I/O mapped
>into a PC ISA slot.) They have a connector for hooking up CODECs for
>two-channel audio. I was going to buy one until I saw that the cards
>are $500. :-( Too rich for my blood. I should be able to do one for
>1/4th that much, maybe less...
>
>It turns out that Eric Crabill (haven't heard from him in a LONG time)
>did kinda-sort the same thing a couple years back in school. He used an
>ADSP-2111 and a couple 16-bit D/A's hooked up to an Amiga. (The 2111
>has a pre-cursor of the 2181's IDMA port on it.) Eric sent me his source
>code for drawing lines (which he got from an older Analog Devices book)
>so the project just got simpler. ;-)
>
>I currently like the AD7249 D/A for the output stage. Dual Voltage
>output, 12-bit serial, glueless interface to the DSP. Kinda spendy ($18
>singles), but I'm in "screw the price, make it *DO* something" mode
>now...

And the serial update is fast enough? I remember looking at serial D/A and for
a 6mhz update needed for an asteroids speed display (all from memory -- maybe it
was 3mhz?) for a dual channel 12 bit port you needed a 144mhz data clock going
into the thing. Does the AD7249 really operate that fast? Or am I missing
something -- which could easily be the case...

-Zonn

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Received on Wed Mar 25 09:57:33 1998