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Regrettably the CD32 is not just a modified A1200. True the specifications for the most part are the same, but there is a major difference. There is a Chip called the Akiko chip which does some specific functions including Chunky to Planar conversion to give some additional effects that the A1200 does not have. You can plug a mouse directly into an CD32 Joystick port and it works fine. Yes you can convert a CD32 into a working A1200 with extra RAM and a floppy drive as well as an accelerator with the an SX-32 or SX-32 Pro, but they are very expensive and finicky to the type of ram they work with (I have one and it's never worked right with RAM in it. Pretty silly to upgrade to an 030 and not have extra RAM though.
A lot of aftermarket floppy drives were modified PC drives and as such were missing specific signals needed for Non-DOS disks to read and work properly. The Disk Ready signal is not needed in standard workbench use, but loading games directly from floppy when required fail with drives that don't generate this signal. Thankfully there are some incredibly bright people out there who have created a workaround for this with adapters. Ian Steadman is one of them and is still selling floppy adapters to this day. And the LED light changing the way the music sounds is because the LED indicates whether a specific filter is in use or not.
The reason certain games would crash with expanded memory was due to the way the software was written. There were areas of memory space that unexpanded machines had that weren't utilized and certain programs took advantage of that. For example, there was a Digitizing program that came out for the Amiga 1000 way back when that worked only with 512K RAM. any more RAM like 1MB on an Amiga2000 and it would crash. I actually did a very unique thing of building colorspace tables in the memory address area above 512KB of ram and if there was RAM there, it would immediately fail. Very interesting times those were. I have only encountered one game that worked only on the A1000 and with a bootdisk you would run from Aminet.net you could boot with the specific conflicting hardware disabled and run that game. It was a Magnetic Scrolls game if I remember correctly.
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