diff --git a/forth/msp430.fth b/forth/msp430.fth
index 9fb041f..8a02158 100644
--- a/forth/msp430.fth
+++ b/forth/msp430.fth
@@ -1,9 +1,20 @@
-: r! 3 sys ;
-: r@ 4 sys ;
+: vector! 10 sys ;
+: reg!    11 sys ;
+: reg@    12 sys ;
+: 2reg!   13 sys ;
+: 2reg@   14 sys ;
+: sr+     15 sys ;
+: sr-     16 sys ;
 
-: rset dup r@ rot | swap r! ;
-: rclr dup r@ rot invert & swap r! ;
-: rtgl dup r@ rot ^ swap r! ;
+: reg [ ' reg@ ' reg! ] literal literal ;
+: 2reg [ ' 2reg@ ' 2reg! ] literal literal ;
+
+: set ( b r reg/wreg -- )
+  >r over r> execute >r rot r> | -rot execute ;
+: clear ( b r reg/wreg -- )
+  >r over r> execute >r rot invert r> & -rot execute ;
+: toggle ( b r reg/wreg -- )
+  >r over r> execute >r rot r> ^ -rot execute ;
 
 16 base !
 
@@ -841,3 +852,28 @@
 
 decimal
 
+: ECOMP0_VECTOR    0 ;
+: PORT6_VECTOR     1 ;
+: PORT5_VECTOR     2 ;
+: PORT4_VECTOR     3 ;
+: PORT3_VECTOR     4 ;
+: PORT2_VECTOR     5 ;
+: PORT1_VECTOR     6 ;
+: ADC_VECTOR       7 ;
+: EUSCI_B1_VECTOR  8 ;
+: EUSCI_B0_VECTOR  9 ;
+: EUSCI_A1_VECTOR  10 ;
+: EUSCI_A0_VECTOR  11 ;
+: WDT_VECTOR       12 ;
+: RTC_VECTOR       13 ;
+: TIMER0_B1_VECTOR 14 ;
+: TIMER0_B0_VECTOR 15 ;
+: TIMER3_A1_VECTOR 16 ;
+: TIMER3_A0_VECTOR 17 ;
+: TIMER2_A1_VECTOR 18 ;
+: TIMER2_A0_VECTOR 19 ;
+: TIMER1_A1_VECTOR 20 ;
+: TIMER1_A0_VECTOR 21 ;
+: TIMER0_A1_VECTOR 22 ;
+: TIMER0_A0_VECTOR 23 ;
+
diff --git a/msp430/alee-msp430.cpp b/msp430/alee-msp430.cpp
index 1d8d157..14ccfd0 100644
--- a/msp430/alee-msp430.cpp
+++ b/msp430/alee-msp430.cpp
@@ -43,6 +43,9 @@ static void Software_Trim();
 //__attribute__((section(".upper.bss")))
 //static uint8_t hidict[16384];
 
+static Addr isr_list[24] = {};
+static SplitMemDictRW<sizeof(alee_dat), 16384> dict (alee_dat, 0x10000);
+
 int main()
 {
     WDTCTL = WDTPW | WDTHOLD;
@@ -52,7 +55,6 @@ int main()
     SYSCFG0 = FRWPPW;
 
     (void)alee_dat_len;
-    static SplitMemDictRW<sizeof(alee_dat), /*sizeof(hidict)*/16384> dict (alee_dat, 0x10000/*(uint32_t)hidict*/);
     State state (dict, readchar);
 
     serputs("alee forth\n\r");
@@ -153,13 +155,30 @@ void user_sys(State& state)
     case 2: // emit
         serput(state.pop());
         break;
-    case 3:
+    case 10:
+        { auto index = state.pop();
+          isr_list[index] = state.pop(); }
+        break;
+    case 11:
         { auto addr = state.pop();
           *reinterpret_cast<uint8_t *>(addr) = state.pop() & 0xFFu; }
         break;
-    case 4:
+    case 12:
         state.push(*reinterpret_cast<uint8_t *>(state.pop()));
         break;
+    case 13:
+        { auto addr = state.pop();
+          *reinterpret_cast<uint16_t *>(addr) = state.pop() & 0xFFFFu; }
+        break;
+    case 14:
+        state.push(*reinterpret_cast<uint16_t *>(state.pop()));
+        break;
+    case 15:
+        _bis_SR_register(state.pop());
+        break;
+    case 16:
+        _bic_SR_register(state.pop());
+        break;
     default:
         break;
     }
@@ -310,3 +329,42 @@ void Software_Trim()
     while(CSCTL7 & (FLLUNLOCK0 | FLLUNLOCK1)); // Poll until FLL is locked
 }
 
+void alee_isr_handle(unsigned index)
+{
+    const Addr isr = isr_list[index];
+
+    if (isr != 0) {
+        State isrstate (dict, readchar);
+        isrstate.execute(isr);
+    }
+}
+
+#define DEFINE_ISR(VVV, III) \
+    __attribute__((interrupt(VVV))) \
+    void VVV##_ISR() { alee_isr_handle(III); }
+
+DEFINE_ISR(ECOMP0_VECTOR, 0)
+DEFINE_ISR(PORT6_VECTOR, 1)
+DEFINE_ISR(PORT5_VECTOR, 2)
+DEFINE_ISR(PORT4_VECTOR, 3)
+DEFINE_ISR(PORT3_VECTOR, 4)
+DEFINE_ISR(PORT2_VECTOR, 5)
+DEFINE_ISR(PORT1_VECTOR, 6)
+DEFINE_ISR(ADC_VECTOR, 7)
+DEFINE_ISR(EUSCI_B1_VECTOR, 8)
+DEFINE_ISR(EUSCI_B0_VECTOR, 9)
+DEFINE_ISR(EUSCI_A1_VECTOR, 10)
+DEFINE_ISR(EUSCI_A0_VECTOR, 11)
+DEFINE_ISR(WDT_VECTOR, 12)
+DEFINE_ISR(RTC_VECTOR, 13)
+DEFINE_ISR(TIMER0_B1_VECTOR, 14)
+DEFINE_ISR(TIMER0_B0_VECTOR, 15)
+DEFINE_ISR(TIMER3_A1_VECTOR, 16)
+DEFINE_ISR(TIMER3_A0_VECTOR, 17)
+DEFINE_ISR(TIMER2_A1_VECTOR, 18)
+DEFINE_ISR(TIMER2_A0_VECTOR, 19)
+DEFINE_ISR(TIMER1_A1_VECTOR, 20)
+DEFINE_ISR(TIMER1_A0_VECTOR, 21)
+DEFINE_ISR(TIMER0_A1_VECTOR, 22)
+DEFINE_ISR(TIMER0_A0_VECTOR, 23)
+