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

src/aliases/,aliases_config.s

@@ -451,6 +451,14 @@
 
 
 
+; Determine if it is OK to include tape autocalibration routines
+
+!ifndef CONFIG_MB_M65 {
+	!set HAS_TAPE_AUTOCALIBRATE = 1
+}
+
+
+
 ; Defines for multi-segment ROMs
 
 !ifdef CONFIG_MB_M65 {

src/aliases/,aliases_ram_lowmem.s

@@ -310,11 +310,14 @@
 
 !ifdef HAS_TAPE {
 
+!ifdef HAS_TAPE_AUTOCALIBRATE {
+
 	!addr __normal_time_S             = IRQTMP+0          ; duration of the short pulse
 	!addr __normal_time_M             = IRQTMP+1          ; duration of the medium pulse
 
 	!addr __turbo_half_S              = IRQTMP+0          ; half-duration of the short pulse
 	!addr __turbo_half_L              = IRQTMP+1          ; half-duration of the long pulse
+}
 
 	!addr __pulse_threshold           = SVXT              ; pulse classification threshold
 	!addr __pulse_threshold_ML        = SYNO              ; M/L pulse classification threshold, for normal only