dlou@dino.ucsd.edu (Dennis Lou) (08/22/90)
In article <3954@bwdls58.UUCP> mlord@bwdls58.bnr.ca (Mark Lord) writes: >Sounds like an interrupt conflict. A bus mouse card is simply another serial >port, dedicated to the mouse. It probably has jumpers to select which interrupt Okay, I've heard this several times before. My problem is that I have a leftover bus mouse but no bus card for it. Anyone have any ideas how I can hook it up short of paying the $25+tax for a used bus card from Computer Surplus in San Jose, CA? In case it matters, it's an old 2 button Logitech. Thanks. -- Dennis Lou Disclaimer: I don't use lame disks. dlou@dino.ucsd.edu "But Yossarian, what if everyone thought that way?" [backbone]!ucsd!dino!dlou "Then I'd be crazy to think any other way!"
Jeff.Miller@samba.acs.unc.edu (BBS Account) (08/23/90)
It shouldn't be too hard to figure it out. Open your mouse and figure out which of the pins on the connector is power and ground. Hopefully you can do this by hooking one lead of your voltmeter (use a DMM with a low current flow during the ohms tests to avoid blowing any chips) to the pin in the upper left hand corner of one of the chips. That is usually +5 volts. In the lower right hand corner is usually GND. If you can figure it out apply power and then figure out what kind of signal you are getting out. There are two possible problems with the output signal. One is that the signal is inverted and the other is that it will not meet the RSZ-232 specs. If it is inverted there may be some soldered-in jumpers or something but you probably won't have this problem. It is very likely however that the signal from your bus mouse will not be RS-232. It will be a TTL signal. Though I haven't tried it myself, it should be possible to prise out the appropriate 14XX chip in your serial port card (assuming you bought one of those cards which has sockets for these chips so you can buy it with one serial port and them add another) and using wire jumpers feed the output of your mouse directly into your UART. All this advice assumes there is some standard way of supplying power to a mouse from a serial port. I must admit I have never looked into it and so the matter is a mystery. Do IBMs put power on a pin? Does the mouse fake it by drawing miniscule power from DTR? I don't know but five minutes with a DMM should help you figure it out.. -cornhead