Posted By
Litwr
on 2016-12-27
11:38:14
|  Re: PC RS232 Mouse project for Plus/4 User port_a cheap and working one :-)
>1) BTW how did you manage the negative value movements?
The same as the positive because it is two's complement. For example, -1 = $ff, 5-1=5+$ff.
2) What we checked in Multibotticelli that it does not use IQRs, so ACIA could be the only one.
The raster interrupts provide timer and should not be disabled even by Multibotticelli.
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