diff --git a/include/a8_antic.mfk b/include/a8_antic.mfk
index 8566a148..853c9e3f 100644
--- a/include/a8_antic.mfk
+++ b/include/a8_antic.mfk
@@ -19,6 +19,5 @@ volatile byte antic_vcount @$D40B // vertical line counter
 volatile byte antic_penh   @$D40C // light pen horizontal position
 volatile byte antic_penv   @$D40D // light pen vertical position
 volatile byte antic_nmien  @$D40E // non-maskable interrupt enable
-
-// nmi reset status
-volatile byte antic_nmires @$D40F
+volatile byte antic_nmist  @$D40F // (R) NMI status; holds cause for the NMI interrupt, corresponding to the same bits in NMIEN
+volatile byte antic_nmires @$D40F // (W) Reset for NMIST; clears the interrupt request register
diff --git a/include/a8_os.mfk b/include/a8_os.mfk
index c3258365..c31915f1 100644
--- a/include/a8_os.mfk
+++ b/include/a8_os.mfk
@@ -424,6 +424,7 @@ volatile byte os_CDTMF4 @$022C         // COUNT DOWN TIMER 4 FLAG
 volatile byte os_INTEMP @$022D         // IAN'S TEMP
 volatile byte os_CDTMF5 @$022E         // COUNT DOWN TIMER FLAG 5
 volatile byte os_SDMCTL @$022F         // SAVE DMACTL REGISTER
+volatile word os_SDLST  @$0230         // SAVE DISPLAY LIST
 volatile byte os_SDLSTL @$0230         // SAVE DISPLAY LIST LOW BYTE
 volatile byte os_SDLSTH @$0231         // SAVE DISPLAY LIST HI BYTE
 volatile byte os_SSKCTL @$0232         // SKCTL REGISTER RAM