lloyd@comp.vuw.ac.nz (Lloyd Parkes) (11/27/89)
Okay now, The mouse transmits at 1200, 7N1, and the driver is interrupt driven (of course). The information is transmitted in three characters. 1) bit 6 set bit 5 left button bit 4 right button bits 3&2 top two bits of the y movement bits 1&0 top two bits of the x movement 2) bit 6 reset bits 0-5 x movement 3) bit 6 reset bits 0-5 y movement The bits in the first byte should be shifted and then set into the 2nd and 3rd bytes. e.g. x1xxxxXX first byte XX000000 shift left xxXXXXXX 2nd byte XXXXXXXX ored with first byte ditto for the Y movement, this value is signed, and you should do a CBW in assembler or cast to int in C or DEL *.EXE in BASIC :-) You must test for data overrun and if you get a bit 6 set, then it is the first, unconditionally. If you are expecting a 1st byte, and you get one with bit 6 reset, discard it. Lloyd -- ------------------------------------------------------------------------ Lloyd | lloyd@comp.vuw.ac.nz | Now all I have to do is write X Parkes | ...!uunet!vuwcomp!lloyd | window & segment swapping ------------------------------------------------------------------------