Hello, * On Tue, Aug 27, 2019 at 05:38:37PM +0200 silverdr_at_wfmh.org.pl wrote: > > > On 2019-08-27, at 07:10, Spiro Trikaliotis <ml-cbmhackers_at_trikaliotis.net> wrote: [...] > > ... which is, essentially, what the (infamous) 5710 chip in inside the > > 1571CR (128DCR) does. > > I (again…) forgot what was the main problem with the DCR that it got > so much negativity. Was it because of this chip and potentially > related incompatibility? IIRC, the serial bus was "compatible enough" and should not do much harm. But, to be sure, I would have to re-check. I am currently lacking time for this. The biggest issue was the WD177x replacement part of the 5710, that was very different. So, (not only) because of this, the Floppy ROM of the 1571CR differs essentially from the 1571, so any program that uses jump addresses in the $8000-$BFFF area is likely to break, as is any program that tries to access the WD177x directly. From the ROM code, I can see that even the order of the accesses of the registers is different. Regards, Spiro. -- Spiro R. Trikaliotis http://www.trikaliotis.net/Received on 2019-08-27 20:43:58
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