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- Path: canopus.cc.umanitoba.ca!pollux!umcwikla
- From: umcwikla@cc.umanitoba.ca (Tom Cwikla)
- Newsgroups: comp.sys.cbm
- Subject: Re: Mouse Wanted
- Date: 14 Mar 96 01:30:54 GMT
- Organization: The University of Manitoba
- Message-ID: <umcwikla.826767054@pollux>
- References: <4hj4cc$sde@madeline.INS.CWRU.Edu> <4hs0rv$g49@twizzler.callamer.com>
- NNTP-Posting-Host: pollux.cc.umanitoba.ca
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-
- In <4hs0rv$g49@twizzler.callamer.com> csmith@slonet.org (C. Deforrest Smith) writes:
- >While we're on the topic of mice, I have another silly question... Is
- >the Amiga mouse anything like the 1351/1352 mice?
-
- Nope. Nothing like it at all. The 1351 mouse is analog (uses two "circular"
- pots) and the Amiga mouse is quadrature (uses four TTL signals). Some
- programs were written for the C64 that can read an Amiga mouse, but there's
- not many of these around. Doing this requires rather fast polling of the
- joystick pins (this is where the quadrature signals map to when you plug an
- Amiga mouse into the C64) and can not effectively be done under Geos which
- only calls the input driver 60 times per second.
-
- >Is it close enough
- >to be hackable?
-
- This can be done but it requires a handful of chips. Two quadrature decoders
- (you can actually do this using binary up/down counters which are not really
- quadrature decoders but good enough for a mouse) and a pair of DACs, or
- you can roll your own resistor-ladder networks.
-
- >Any other 1351-alikes out there?
-
- As far as I know, only CMD sells these, and for a price which is quite
- ridiculous for us Canadian residents.
-
- >I've got a pile of '64's here, and they all want mice. :->
-
- I only have one, and I would like a mouse for it as well. I'll probably end
- up building a converter and using the Amiga mouse.
-
- --Tom.
-