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-rw-r--r--macros/code.asm1
1 files changed, 1 insertions, 0 deletions
diff --git a/macros/code.asm b/macros/code.asm
index e393d495..a5d8c756 100644
--- a/macros/code.asm
+++ b/macros/code.asm
@@ -38,6 +38,7 @@ maskbits: MACRO
; maskbits 26
; cp 26
; jr nc, .loop
+ assert 0 < (\1) && (\1) <= $100, "bitmask must be 8-bit"
x = 1
rept 8
if x + 1 < (\1)