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- Path: sparky!uunet!mcsun!uknet!bhamcs!percy!imr
- From: imr@cs.bham.ac.uk (Ian M Rae)
- Newsgroups: comp.sys.atari.st.tech
- Subject: Re: STE sampler using analogue joystick ports ?
- Keywords: STE sampler
- Message-ID: <1993Jan21.115552@cs.bham.ac.uk>
- Date: 21 Jan 93 11:55:52 GMT
- References: <C10ApH.Dou@cs.bham.ac.uk> <1993Jan19.232613.5129@ugle.unit.no>
- Sender: news@cs.bham.ac.uk
- Organization: University of Birmingham
- Lines: 34
- Nntp-Posting-Host: mb10
-
- In article <1993Jan19.232613.5129@ugle.unit.no>, ivarh@Lise.Unit.NO (Ivar Haugen) writes:
- |> In article <C10ApH.Dou@cs.bham.ac.uk>, imr@cs.bham.ac.uk (Ian M Rae) writes:
- |>
- |> > ...does anyone know if it is possible to make a sampler for an STE that
- |> > connects to the analogue joystick ports and uses the internal ADC ?
- |>
- |> When I got my STE, I wanted to do what you are sugesting, but after having
- |> experimented a bit, I found that what was meassured vas not voltage (V) but
- |> ressistance (Ohm's) to 0V.
- |>
- |> (0 - 2 Mohm gave values from 0 - 255 in the registers)
- |>
- |> So I belive there's no internal ADC, but just a counter meassuring the time
- |> it takes a capasitor (F) to unload througth the resistor connected to the port.
- |>
- |> This, in my opinion, makes is impossible to make sutch a sampler.
- |>
- |> Ivar Haugen
- |> ivarh@lise.unit.no
-
- Other people have mailed me saying that it is just an variable oscillator using
- the resistor in a joystick etc. as the variable part. The pulses from this are
- then just counted. Still it was a nice idea while it lasted :). Still, I can now
- try and connect my old Atari Touch Tablet up... should be good for a laugh !
-
- Thanks for the help
-
-
-
- +--------------------------+--------------------------------------------+
- | Ian Rae | "Baldrick, this is the stickiest situation |
- | Software Engineer | since Sticky the stick insect got stuck on |
- | University of Birmingham | a sticky bun." - Blackadder goes Forth |
- +--------------------------+--------------------------------------------+
-