mtx: mask sector count on side1

The MTX512 doesn't write sector labels 17-32 on the second side but recycles
1-16

diff --git a/Kernel/platform-mtx/floppy.s b/Kernel/platform-mtx/floppy.s
index 2a9768d..ad5a7c1 100644 (file)
--- a/Kernel/platform-mtx/floppy.s
+++ b/Kernel/platform-mtx/floppy.s
@@ -96,6 +96,7 @@ seekside1:
 seekside:
        out     (FDCCTRL), a
        ld      a, SECTOR(ix)
+       and     #15
        inc a
        out     (FDCSEC), a
        ld      a, TRACK(ix)
@@ -145,6 +146,7 @@ fdio_s1:set 1, a
 fdio_setsec:
        out     (FDCCTRL), a
        ld      a, SECTOR(ix)
+       and     #15
        inc     a               ; 1 based
        out     (FDCSEC), a
        in      a, (FDCREG)     ; Clear any pending status