Posted By
MMS
on 2016-12-27
11:21:22
 |  Re: PC RS232 Mouse project for Plus/4 User port_a cheap and working one :-)
Hi,
thanks! That's great!
our code looked much much longer and more complex, I dunno why 
1) BTW how did you manage the negative value movements?
I tried to follow your code, but missed that point. My bad...
The highest 7. bit of the X7-X0 and Y7-Y0 means -128, this is the maximum left /up movement at once, and +127 is the maximum right /down one. We could manage it only with a lot of jumps in the code.
2) Actually, no.
What we checked in Multibotticelli that it does not use IQRs, so ACIA could be the only one. 
In case of Graphic3 mode in BASIC, could cause some troubles. Otherwise no IRQs expected, at least in BASIC.
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