diff --git a/Asm65/OpDef.cs b/Asm65/OpDef.cs
index 67acfe3..b5d05af 100644
--- a/Asm65/OpDef.cs
+++ b/Asm65/OpDef.cs
@@ -2049,6 +2049,7 @@ namespace Asm65 {
             Opcode = 0x6c,
             AddrMode = AddressMode.AbsInd,
             CycDef = 5 | (int)(CycleMod.OneIf65C02)
+            // takes one extra cycle on CMOS 6502 if low byte is 0xff?? (it also has a bug)
         };
         public static readonly OpDef OpADC_Abs = new OpDef(OpADC) {
             Opcode = 0x6d,
diff --git a/SourceGen/SGTestData/2020-cycle-counts b/SourceGen/SGTestData/2020-cycle-counts-65816
similarity index 100%
rename from SourceGen/SGTestData/2020-cycle-counts
rename to SourceGen/SGTestData/2020-cycle-counts-65816
diff --git a/SourceGen/SGTestData/2020-cycle-counts.dis65 b/SourceGen/SGTestData/2020-cycle-counts-65816.dis65
similarity index 100%
rename from SourceGen/SGTestData/2020-cycle-counts.dis65
rename to SourceGen/SGTestData/2020-cycle-counts-65816.dis65
diff --git a/SourceGen/SGTestData/Expected/2020-cycle-counts_64tass.S b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_64tass.S
similarity index 100%
rename from SourceGen/SGTestData/Expected/2020-cycle-counts_64tass.S
rename to SourceGen/SGTestData/Expected/2020-cycle-counts-65816_64tass.S
diff --git a/SourceGen/SGTestData/Expected/2020-cycle-counts_Merlin32.S b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_Merlin32.S
similarity index 100%
rename from SourceGen/SGTestData/Expected/2020-cycle-counts_Merlin32.S
rename to SourceGen/SGTestData/Expected/2020-cycle-counts-65816_Merlin32.S
diff --git a/SourceGen/SGTestData/Expected/2020-cycle-counts_acme.S b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_acme.S
similarity index 100%
rename from SourceGen/SGTestData/Expected/2020-cycle-counts_acme.S
rename to SourceGen/SGTestData/Expected/2020-cycle-counts-65816_acme.S
diff --git a/SourceGen/SGTestData/Expected/2020-cycle-counts_cc65.S b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_cc65.S
similarity index 100%
rename from SourceGen/SGTestData/Expected/2020-cycle-counts_cc65.S
rename to SourceGen/SGTestData/Expected/2020-cycle-counts-65816_cc65.S
diff --git a/SourceGen/SGTestData/Expected/2020-cycle-counts_cc65.cfg b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_cc65.cfg
similarity index 96%
rename from SourceGen/SGTestData/Expected/2020-cycle-counts_cc65.cfg
rename to SourceGen/SGTestData/Expected/2020-cycle-counts-65816_cc65.cfg
index cda17f9..4cc1dc5 100644
--- a/SourceGen/SGTestData/Expected/2020-cycle-counts_cc65.cfg
+++ b/SourceGen/SGTestData/Expected/2020-cycle-counts-65816_cc65.cfg
@@ -1,4 +1,4 @@
-# 6502bench SourceGen generated linker script for 2020-cycle-counts
+# 6502bench SourceGen generated linker script for 2020-cycle-counts-65816
 MEMORY {
     MAIN: file=%O, start=%S, size=65536;
 #    MEM000: file=%O, start=$10f0, size=126;
diff --git a/SourceGen/SGTestData/Source/2020-cycle-counts.S b/SourceGen/SGTestData/Source/2020-cycle-counts-65816.S
similarity index 100%
rename from SourceGen/SGTestData/Source/2020-cycle-counts.S
rename to SourceGen/SGTestData/Source/2020-cycle-counts-65816.S