--- /dev/null
+.include "t-macros.i"
+
+ start
+
+ PSW_BITS = PSW_DM
+
+;;; Blat our DMAP registers so that they point at on-chip imem
+
+ ldi r2, MAP_INSN | 0xf
+ st r2, @(DMAP_REG,r0)
+ ldi r2, MAP_INSN
+ st r2, @(IMAP1_REG,r0)
+
+;;; Patch the interrupt vector's dbt entry with a jmp to success
+
+ ldi r4, #trap
+ ldi r5, (VEC_DBT & DMAP_MASK) + DMAP_BASE
+ ld2w r2, @(0,r4)
+ st2w r2, @(0,r5)
+ ld2w r2, @(4,r4)
+ st2w r2, @(4,r5)
+
+test_dbt:
+ dbt -> nop
+ exit47
+
+success:
+ checkpsw2 1 PSW_BITS
+ exit0
+
+ .data
+trap: ldi r1, success@word
+ jmp r1