trs80: Check the PV flag not C on 8bit dec

diff --git a/Kernel/platform-trs80/trs80.s b/Kernel/platform-trs80/trs80.s
index 3d73c1d..5e83576 100644 (file)
--- a/Kernel/platform-trs80/trs80.s
+++ b/Kernel/platform-trs80/trs80.s
@@ -84,7 +84,7 @@ ctcloop:    out (c), b                        ; register
            out (0x89), a               ; data
            inc hl
            dec b
-           jr nc, ctcloop
+           jp po, ctcloop
 
            ; clear screen
            ld hl, #0xF800