I finished up a similar project that used 3 74ac573 chips the only
propblem I ran into was having the outputs come on before the oopic
got all powered up. ended up with a pull op on the /OE and had the
oopic pull it low to enable the latches after it got the initial
delay. I didn't think to try the oDatastrobe to set the latches
though. just pulsed each of the output pins connected to the LE on
the chips to write the date to the latches. seemed the simplest way
at the time.
>
> Hi
> I have had an older oopic module A2 version for a while,and used it
> for quite a few projects.The limitations I have found were memory
size
> and my own limited capabilities with programming. I have learned a
lot
> from reading the posts and answers in this group to get the desired
> results. Now I am trying to use this A2 module to take over driving
my
> Christmas lights from a commodore64 computer. The commodore has a
> feature not to publicized which is using the joystick ports as an
> output.These I used for clocking and chip clear. I am driving
> 4-74ls273's 8 bit data flip flops and have 32 channels.
> I was trying to use one oDIO8 with 4 oDataStrobe bits and couldn't
> get it to work.So I used chip enable and bus type data with a
> clocking bit to all chips.
> Here is a very shortened version of the program so far
> as seen it is all straight data being stored and used.
>
> -Can oDataStrobe be made to work?
> and has any one hooked up an external eprom ie 27512 for reading
data
> and processing through the oopic.
> any pointer in shortening this would be a great help.....left out
the
> Pulse width modulation stuff also.
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