74SC240 cross or datasheet?

I'm back to looking at my Kozmik Krooz'r. The joystick doesn't work and one thing I noticed is someone replaced the 74SC240 with a 74LS240.

Does anyone know if the LS240 or HCT240 are drop in replacements?
Does anyone have a data sheet for the SC240? I've looked around the web & RGVAC and couldn't find a link to one.

Thanks.
Steve

--- On Wed, 7/16/08, teeray <teeray@earthlink.net> wrote:

> From: teeray <teeray@earthlink.net>
> Subject: Re: RASTER: How does the Midway analog joystick work on a Kozmik Krooz'r? (schematic incl)
> To: rasterlist@vectorlist.org
> Date: Wednesday, July 16, 2008, 6:32 PM
> Y-Output
> You should have a Freq. on PIN 10 of IC 4A
> (If not then something is wrong with 4B and it's
> components.)
>
> Then on 4A PIN 9 (TSP1) you should have the (FREQ of PIN
> 10) divided by 2
> On PIN 4 it is divided by 128
>
> IC 3A outputs should be counting the FREQ.
>
> X-Output works the same as Y-Output
>
> Tim
>
> -----Original Message-----
> >From: Teaganm
>
> >I'm trying to figure out the joystick on a Kozmik
> Krooz'r. It's an analog
> >type that slides a core through a choke. I have 5V
> & GND at pins 1 & 3.
> >I'd expect to see an analog siginal at 3B pin 4
> & 4A pin 4 and a digital
> >count at outputs Y0-Y7 & X0-X7 but I can't seem
> to get any result. Any
> >ideas?
> >
> >Schematic here:
> >http://teaganm.cademo.com/images/other/kroozr%20joystick%20pcb.jpg
> >or here:
> >http://tinyurl.com/6asqwc
> >
> >Thanks.
> >Steve
> >

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Received on Tue Nov 18 14:05:20 2008