11.12 Tandy 2500 XL with MS-DOS in ROM The Tandy 2500 XL can be configured to use MS-DOS in read-only memory (ROM). If you want to use this feature, after you run Windows Setup you must run the Tandy setup program (SETUPXL). Modify your configuration so that your AUTOEXEC.BAT and CONFIG.SYS files are read from drive C. .