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diff --git a/tests/stack_machine_old_mul/instructions.s.tcl b/tests/stack_machine_old_mul/instructions.s.tcl
new file mode 100755
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+++ b/tests/stack_machine_old_mul/instructions.s.tcl
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+#!/usr/bin/env tclsh
+
+source tclasm.tcl
+
+### store 4 values to memory; load 2 of them back, multiply them and store the
+### result; load another 2, multiply them and store the result;
+### this is similar to addition and substraction tests
+
+set_sp h7FFFC
+
+## store first 2 factors
+const 483091365
+store@ h1EEE0
+const 74683203
+store@ h1EEE4
+
+## store other 2 factors
+const 8436
+store@ h1EEEC
+const -14020
+store@ h1EEF0
+
+## perform the first multiplication
+load@ h1EEE0
+stack down
+load@ h1EEE4
+# multiplying 483091365 by 74683203 should yield 36078810479842095
+# if we take lowest 32 bits of 36078810479842095 we get 2861683503
+mul
+stack up
+store@ h1EEE8
+
+## perform the second multiplication
+load@ h1EEEC
+stack down
+load@ h1EEF0
+# multiplying 8436 by -14020 should yield -118272720 (which fits in 32 bits)
+mul
+stack up
+store@ h1EEF4
+
+halt