Re: Rate Multiplier BD? What do I have?

This might be an after market device that would automatically change the
IRQ frequency that the cpu got. I didn't recall that Atari made one,
but... This would thus speed the game up...operators were really
frustrated with the folks that would have a string of extra lives
stretching across the screen. There were adds for these things in the
industry mags in the early 80's as well as in STJ. I might have some
info on the settings, but I doubt it. LMK if no one else can help, I'll
try and do some deep digging.

John :-#)#

JOE.MAGIERA@a1il.ameritech.com wrote:
>
> What do I have here?
>
> It's a small board, 3.5 inches wide, 4.5 inches tall. I got it from a guy
> that said he took it off an Asteroids board. I think I remember some
> recent conversation here that sounded like this. The board has printed on
> it:
>
> RATE MULTIPLIER BD
> A035885
> ATARI c 80
>
> The solder side has printed on it: 035886
>
> It's got three rows of 4 chips. The top row is labeled K7, J7, H7, and
> F7. These are soldered in chips that may read (the writing is small, so
> I'm not sure) 8001 @ K7 & J7, 7940 @ H7, and DM74LS02K @ F7. The middle
> row are socketed, but are empty and are labeled K8, J8, H8, and F8. This
> row has pins on the solder side that would fit into another board. The
> bottom row is socketed and labeled K9, J9, H9, and F9. The numbers are
> really hard to read, but all appear to be the same and have 35904, DM74S5
> (as best as I can read).
>
> At first I thought this might be the speed up chip for Asteroids, but I
> remember Jess once telling me this was just a change on the main board.
>
> All right you guys, what's the story?
>
> Joe
>
> joe.magiera@ameritech.com

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