tape autocalibration code is dangerous on 1MHz, disable it for slower machines

STATUS.md

@@ -18,7 +18,7 @@ Here are the features of the Open ROMs not found in the original ROMs from the 8
 * `LIST` command should never damage the screen if trying to list memory content which is not a BASIC program
 * high performance garbage collector
 
-* turbo tape load support (as device 7, or using `←L` / `←M`, optionally with a file name), quite sophisticated: up to 250 blocks (can store bytes under I/O), automatically adjusts for tape speed differences
+* turbo tape load support (as device 7, or using `←L` / `←M`, optionally with a file name), quite sophisticated: up to 250 blocks (can store bytes under I/O), on MEGA65 motherboard automatically adjusts itself for tape speed differences
 * normal tape load error log is limited by free stack space only (no artificial limitation like in original ROMs)
 * tape format autodetection; normal vs turbo is mostly transparent to user
 * improved support for tape adapters (for using regular casette players and other audio devices instead of Datasette) and emulators