I decided to do some experimentation and wanted to report my observations in case anyone might be interested. My system has the following in the PEB: SAMS, TI FDC 80-TRKmod, TI RS232 with HDX, HRD4000B with 8MB, TIPI, and IDE. I had installed FC 0.9 on the FG99 a while back and have been using for a while. The IDE was set with CRU 1000, HRD400B with CRU 1200, TIPI with CRU 1400. The DSK and DSK1 emulation was off on IDE and HRD4000B. I upgraded FC to 1.1 and 1.2 failed to recognize the HRD4000B, but other software worked fine. I went back to FC 0M worked fine all cards and all disks worked with it.
I decided to swap the CRUs on the IDE and HRD4000B and tried FC 1.3. FC 1.3 recognized and worked with the HRD4000B and the IDE but stopped recognizing TIPI and HDX. It would not take "cd" or "dir" commands to 1400.DSK4, TIPI or 1300.HDX1 or HDX1. Changed CRU on TIPI to 1200 and IDE to 1400. After the change FC recognized HRD and TIPI but not HDX1 or IDE. Changed IDE back to 1200 TIPI to 1800 and tried again. FC recognized HRD and IDE but not HDX1 or TIPI. Pulled the TIPI card and restarted. FC now recognized all remaining cards and devices.
The only DSK mapped on TIPI was DSK4 to "."