[Coco] ADOS 3 Rom Question

[Derek]

I just got a 28 pin ADOS 3 ROM chip and would like some help on installing into an FD-502 Controller if possible. The Controller I have as 2 ROM Sockets the 28 PIN ROM installed says WDC'83 with a chip number WD1773-ph. The 24 Pin ROM is a Tandy Chip number SCM92128P. When I replaced the 28 PIN ROM with the Ados chip I bought it comes up with the standard Disk Extended Basic screen. (I put back the original ROM chip and the controller works fine so I did not destroy anything)

My questions are
1: Is this chip compatible with this controller?
2: If yes how do I engage ADOS?
3: If no what controlls will work with it?

I do have an old FD-500 controller that has the same configuration (24 Pin ROM has Disk Extdnded Basic and 28 Pin ROM is WDC'83 Chip) But I have not tried on this controller as I wanted to get some help 1st.

Thank you




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