X-Git-Url: http://git.subgeniuskitty.com/pdp11-memory-test/.git/blobdiff_plain/7f6351974f74ccf0c9604e95d061750ec5f7e70d..ff4fc7055a3ffed37edef9e5dbfbdffb0cc3cab0:/pdp11_register.h

diff --git a/pdp11_register.h b/pdp11_register.h
index b5a8e79..1fab2e5 100644
--- a/pdp11_register.h
+++ b/pdp11_register.h
@@ -166,6 +166,12 @@
  * =============================================================================
  */
 
+/*
+ * These take the form of "(width),(offset)".  For example, if a field is
+ * 4-bits wide and occupies bits 2-5 (starting from 0), then it would be
+ * defined as "(017),(2)".
+ */
+
 #define MMR0_AB_NONRES (01),(15)
 #define MMR0_AB_PAGLEN (01),(14)
 #define MMR0_AB_RO     (01),(13)