diff --git a/libsrc/apple2/get_tv.s b/libsrc/apple2/get_tv.s
index 830cc4ac1..b2eb4d857 100644
--- a/libsrc/apple2/get_tv.s
+++ b/libsrc/apple2/get_tv.s
@@ -8,7 +8,7 @@
         .import         _set_iigs_speed, _get_iigs_speed
         .import         ostype
 
-        .constructor    calibrate_tv, 2
+        .constructor    calibrate_tv, 8 ; After ostype
 
         .include    "accelerator.inc"
         .include    "apple2.inc"
diff --git a/libsrc/apple2/libref.s b/libsrc/apple2/libref.s
index 8aa54abab..e3d713a5d 100644
--- a/libsrc/apple2/libref.s
+++ b/libsrc/apple2/libref.s
@@ -2,10 +2,9 @@
 ; Oliver Schmidt, 2013-05-31
 ;
 
-        .export         em_libref, mouse_libref, ser_libref, tgi_libref
+        .export         em_libref, ser_libref, tgi_libref
         .import         _exit
 
 em_libref       := _exit
-mouse_libref    := _exit
 ser_libref      := _exit
 tgi_libref      := _exit
diff --git a/libsrc/apple2/mou/a2.stdmou.s b/libsrc/apple2/mou/a2.stdmou.s
index e48abbb41..9c2f96200 100644
--- a/libsrc/apple2/mou/a2.stdmou.s
+++ b/libsrc/apple2/mou/a2.stdmou.s
@@ -7,6 +7,7 @@
         .include        "zeropage.inc"
         .include        "mouse-kernel.inc"
         .include        "apple2.inc"
+        .include        "get_tv.inc"
 
         .macpack        module
 
@@ -21,6 +22,7 @@ CLAMPMOUSE      = $17   ; Sets mouse bounds in a window
 HOMEMOUSE       = $18   ; Sets mouse to upper-left corner of clamp win
 INITMOUSE       = $19   ; Resets mouse clamps to default values and
                         ; sets mouse position to 0,0
+TIMEDATA        = $1C   ; Set mousecard's interrupt rate
 
 pos1_lo         := $0478
 pos1_hi         := $0578
@@ -41,6 +43,7 @@ status          := $0778
         .byte   MOUSE_API_VERSION       ; Mouse driver API version number
 
         ; Library reference
+libref:
         .addr   $0000
 
         ; Jump table
@@ -169,7 +172,31 @@ next:   inc     ptr1+1
         asl
         sta     yparam+1
 
-        ; The AppleMouse II Card needs the ROM switched in
+        ; Apple II technical notes "Varying VBL Interrupt Rate",
+        lda     libref
+        ldx     libref+1
+        sta     ptr1
+        stx     ptr1+1
+
+        .ifdef __APPLE2ENH__
+        lda     (ptr1)
+        .else
+        ldy     #$00
+        lda     (ptr1),y
+        .endif
+
+        cmp     #TV::OTHER
+        beq     :+
+
+        ; The TV values are aligned with the values the mousecard
+        ; expect: 0 for 60Hz, 1 for 50Hz.
+        .assert TV::NTSC = 0, error
+        .assert TV::PAL = 1, error
+
+        ldx     #TIMEDATA
+        jsr     firmware
+
+:       ; The AppleMouse II Card needs the ROM switched in
         ; to be able to detect an Apple //e and use RDVBL
         bit     $C082
 
diff --git a/libsrc/apple2/mouseref.s b/libsrc/apple2/mouseref.s
new file mode 100644
index 000000000..b0e75c367
--- /dev/null
+++ b/libsrc/apple2/mouseref.s
@@ -0,0 +1,25 @@
+;
+; Colin Leroy-Mira, 2025-05-11
+;
+
+        .export         mouse_libref
+        .import         _get_tv, ostype, return0
+
+        .constructor    init_mousetv
+
+        .include        "get_tv.inc"
+
+        .segment "ONCE"
+
+.proc init_mousetv
+        lda     ostype
+        cmp     #$40          ; Technical notes say not to change
+        bcs     :+            ; interrupt rate on IIc/IIgs, so...
+        jsr     _get_tv
+        sta     mouse_libref
+:       rts                   ; ...don't update "Other" on those machines
+.endproc
+
+        .data
+
+mouse_libref: .byte TV::OTHER