Re: Copying Asteroids ROM 035127

Yes that helps thanks. I checked the OKI website yesterday and did
not see the 2716, I only saw 27v1602 (2 mega bit). Quite a bit
bigger than 2K bytes. Maybe I just didnt see the 2716s.

"Mills, Lewis" wrote:
>
> Hi,
> AMD 2716B uses these speed indicators: -105 or -100 is 100ns, -155 or -150
> is 150ns, -205 or -200 is 200ns, etc.
> All the OKI datasheets I found seem to be for 100ns or better parts. (
> http://www.okisemi.com/public/docs/PrdROMDocs.html#ObsoleteROMDocs)
> Here's a datasheet for Hitachi; this one seems to be 450ns.
> (http://www.freetradezone.com/design_center/images/pdf/D0200193.pdf)
> That's all I found so far; hope it helps.
> Lewis
>
> -----Original Message-----
> From: owner-vectorlist@synthcom.com
> [mailto:owner-vectorlist@synthcom.com]On Behalf Of Scott Brasington
> Sent: Monday, February 04, 2002 9:04 PM
> To: vectorlist@synthcom.com
> Subject: Re: VECTOR: Copying Asteroids ROM 035127
>
> Neil Bradley wrote:
> >
> >
> > Sounds like your 2716 might be too slow. They need to be 200ns or better
> > (smaller).
> >
>
> And David Fish wrote:
> > From the Intel 1982 Component Data Catalog:
> >
> > 2716-1: 350 ns Max.
> > 2716-2: 390 ns Max.
> > 2716: 450 ns Max.
> > 2716-5: 490 ns Max
> > 2716-6: 650 ns Max.
>
> Does anybody know which 2716s fit this criteria? eg. manuf & part#
>
> The reason I'm asking, is I was planning on including a 2716 rev2
> vector eprom with each of the Asteroids High Score save kits I'm
> doing, but I want to make sure I provide something that is
> compatible.
>
> I tried 5 different manufacturers of 2716s last night and four of
> them seemed to work, but I don't think any of them are as fast
> as 200ns?? and I can't seem to find any place on the web that
> sells 200ns 2716s. Only one did not work (NEC 2716). The others
> that appear to work fine where OKI 2716, AMD 2716, Hitachi 2716
> and Mitsubishi 2716.
>
> I suppose I could double up a 2732A (200ns), but I have almost
> 400 2716 eproms left over from the double donkey kong days that
> I would much rather use up.
>
> Any info on who makes a 2716 200ns and/or how critical this timing
> requirement is would be appreciated. Thanks.
>
> -Scott
>
> PS. I finished the extended scoring option for the HS kit last
> week. It now supports scores up to 9,999,990. Sample screen shots
> on my webpage. http://www.brasington.org/arcade/hs2/asteroids/
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Received on Mon Feb 4 09:26:02 2002