Posted By
MMS
on 2016-04-12
15:36:49
 |  Re: Who has a broken 1551?
wow, that project... I went through the page, and I dropped my jaw.
Well, I think in the last 2 years I spent 1/10 of the effort to the RS232 mouse project he put in that 1551 hacking... Respect.
OFF
(BTW, anyone is in to do a optimize a RS232 mouse driver? Maybe a competition? 
The HW part is definitely ready, the documentation in 50-60%, but I am struggling to compress the resident driver made by BSZGG (good for some BASIC prg testing) into the space available on zero page, just to speed things up and do not disturb programs).
The code is 327 bytes long, and the longest available free space is 191 bytes (tape buffer) and 141 bytes is in the Speech area. I know, if you add them together, then almost there (and the Y coordinates also use 2 bytes, though 1 would be is enough), but hell, I do not want to load the driver in two parts.  )
CORR: if the resident driver is on zero page and the the X, Y coordinates stored there too (not at $5000), then 54 bytes could be saved VS original size, but still the code 274 bytes long.
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