X-Git-Url: http://git.subgeniuskitty.com/pdp11-memory-test/.git/blobdiff_plain/7f6351974f74ccf0c9604e95d061750ec5f7e70d..dc5bb9bbe89e75612fc2929a5b0f5b0a5b8c0cd1:/pdp11_register.h

diff --git a/pdp11_register.h b/pdp11_register.h
index b5a8e79..1ea9881 100644
--- a/pdp11_register.h
+++ b/pdp11_register.h
@@ -166,6 +166,12 @@
  * =============================================================================
  */
 
+/*
+ * These take the form of a 'width' and 'offset'.  For example, if a field is 3
+ * bits wide, occupying bits 3-5 (starting from 0), then it would be defined as
+ * (07),(3).
+ */
+
 #define MMR0_AB_NONRES (01),(15)
 #define MMR0_AB_PAGLEN (01),(14)
 #define MMR0_AB_RO     (01),(13)