From 5e81f34bf33eab610240a69fbbec5b3f44dbebf6 Mon Sep 17 00:00:00 2001 From: AJR Date: Fri, 6 May 2022 20:50:47 -0400 Subject: [PATCH] v620dasm.cpp: Add comment --- src/devices/cpu/v620/v620dasm.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/devices/cpu/v620/v620dasm.cpp b/src/devices/cpu/v620/v620dasm.cpp index e050bb9463e..74af4537df8 100644 --- a/src/devices/cpu/v620/v620dasm.cpp +++ b/src/devices/cpu/v620/v620dasm.cpp @@ -56,6 +56,8 @@ static const char *const s_index_tags[2] = static const char *const s_reg_names[8] = { "A", "B", "X", "R3", "R4", "R5", "R6", "R7" + // A, B and X are legacy names for V75's R0, R1 and R2. These may also be written as plain + // numbers, though 1 = R2 and 2 = R1 to remain compatible with older indexing syntax. }; static const char *const s_reg_mem_ops[4] =