decision on forth registers

1 files changed, 10 insertions, 0 deletions

diff --git a/readme.md b/readme.md
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--- a/readme.md
+++ b/readme.md
@@ -4,3 +4,13 @@ its a forth for linux x86\_64. mostly made for personal stuff.
 if you use it and it breaks, too bad
 
 public domain
+
+## forth registers
+there are a set of 'virtual registers' (see moving forth part 1)
+
+W, the working register, is r11.
+X, the secondary working register, is r12.
+IP, the instruction pointer, is r13.
+SP, the working stack pointer, is r14.
+RSP, the return stack pointer, is rsp.
+TOS, the top of the stack, is r15.