Posted By
SVS
on 2016-03-08
07:42:55
 |  Re: Ultimate Map V1.8
From what I know the CTS signal is output on bit 4 of $FD01 by the 6551 chip. A fast browsing on the O.S. shows a lot of checkings of the bit 5 of it, but any on bit 4.
From the electric schematic of Plus/4 there is no doubt that pin K of Userport is connected only to the P1 pin of the 6529 chip.
Then the mystery still remains...
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