65c816: fix uputw()

diff --git a/Kernel/usermem_std-65c816.s b/Kernel/usermem_std-65c816.s
index d42934e..103745b 100644 (file)
--- a/Kernel/usermem_std-65c816.s
+++ b/Kernel/usermem_std-65c816.s
@@ -192,9 +192,11 @@ __uputw:
        stx     ptr2+1
        jsr     popax
        phb
+       pha
        lda     U_DATA__U_PAGE
        pha
        plb
+       pla
        sta     (ptr2)
        txa
        ldy     #1