5587Re: [cosmacelf] Re: How can I send a 4 bit binary code to a 4 to 16 decoder?
- Aug 4, 2008Randy: Thanks for the info. I am running the lovely little ELF2K V85. I re-thought my thinking and figure by using an out 4, (some number between 0 and 15) I should be able to pull the bits I need for input off of D0 to D4 there by having all 16 outputs of the decoder usable. Wonder if I need to isolate the decoder from the Elf?. Jim
--- On Sun, 8/3/08, randy129 <randy129@...> wrote:
From: randy129 <randy129@...>
Subject: [cosmacelf] Re: How can I send a 4 bit binary code to a 4 to 16 decoder?
Date: Sunday, August 3, 2008, 5:43 PM
--- In cosmacelf@yahoogrou ps.com, "jamesa4404" <jamesa4404@ ...> wrote:
> I want to send binary code from a Basic program to a 4 to 16 decoder
> like a CD4514 or 74HC4514. I was thinking I could use some code like
> out 1,1: out 2,1: and out 3,1: and out 5,1. If that would work how
> (which pins) would I pull it off the Elf with? I could also use an out,
> (0 to F depending on what code I wanted),1 or some other out, but
> again, where would I go to read the results from the Elf. I have also
> considered using commands like ef1=1: ef2=1 ef3=1 but then I would come
> up 1 bit short, and again what pins would read off the Elf.
The ef1-4 lines are input only.
> I'm sure
> the Elf can do something like this, but I coming up short on the how
> to. Maybe the trick would be to take D0, D1, D2 and D4 into the
That's right. You might even be able to strobe with an unused
n line, but I'm not sure if you would need to only strobe when
/mwr was low, (I'd need to look at 1802 datasheet).
> Any ideas from the group? I would also like to know for sure
> what In(s) and Out(s) and EF's are required by the Elf OS, so I'd know
> which ones I could play with. Jim
You did not say which model of the elf you have. Most probably
have used out port 4, but I really don't know about all the variations.
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