diff --git a/src/inc/extdefseg.inc b/src/inc/extdefseg.inc
new file mode 100644
index 0000000..de324e2
--- /dev/null
+++ b/src/inc/extdefseg.inc
@@ -0,0 +1,11 @@
+;
+; BYTECODE DEFS SEGMENT
+;
+ DB 0          ; PAD BYE
+DEFSEG EQU *
+;
+; INIT CODE RUNS WHEN MODULE LOADED
+;
+MODINIT DB $54 ; CALL ASM INIT
+ DW INIT
+ DB $5C        ; RET
diff --git a/src/inc/extheader.inc b/src/inc/extheader.inc
new file mode 100644
index 0000000..2ca1f76
--- /dev/null
+++ b/src/inc/extheader.inc
@@ -0,0 +1,5 @@
+ DW $6502
+ DW 0        ; SYSFLAGS
+ DW DEFSEG   ; DEF OFFSET
+ DW 1        ; DEF COUNT (INCLUDING INIT)
+ DW MODINIT  ; MOD INIT
diff --git a/src/inc/plasma.inc b/src/inc/plasma.inc
new file mode 100644
index 0000000..4a3e19e
--- /dev/null
+++ b/src/inc/plasma.inc
@@ -0,0 +1,23 @@
+ REL
+ ORG $1000
+;
+; USEFUL ZERO PAGE LOCATIONS
+;
+SRC EQU $06
+SRCL EQU SRC
+SRCH EQU SRC+1
+DST EQU SRC+2
+DSTL EQU DST
+DSTH EQU DST+1
+TMP EQU $E7
+TMPL EQU TMP
+TMPH EQU TMP+1
+ESTKH EQU $C0
+ESTKL EQU $D0
+DROPOP EQU $EF
+NEXTOP EQU $F0
+FETCHOP EQU NEXTOP+1
+;
+; JUMP TO BYTECODE INTERPRETER ADDRESS
+;
+INTERP EQU $03D0