diff --git a/defs128.inc b/defs128.inc
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+++ b/defs128.inc
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+.include "defs.inc"
+
+KEYD   = $034A  ; start of keyboard buffer for C64 screen editor
+NDX    = $D0    ; keyboard buffer count for C64 screen editor
+COLOR  = 241    ; current foreground color
+
+C64MODE   = $FF4D  ; go 64 mode
+
+
+
diff --git a/defs64.inc b/defs64.inc
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--- /dev/null
+++ b/defs64.inc
@@ -0,0 +1,12 @@
+.include "defs.inc"
+
+KEYD   = $0277  ; start of keyboard buffer for C64 screen editor
+NDX    = $C6    ; keyboard buffer count for C64 screen editor
+
+TXTTAB = $2B    ; Pointer to the Start of BASIC Program Text
+VARTAB = $2D    ; Pointer to the Start of the BASIC Variable Storage Area
+
+CINV   = $0314  ; Vector to IRQ Interrupt Routine
+CBINV  = $0316  ; Vector: BRK Instruction Interrupt
+NMINV  = $0318  ; Vector: Non-Maskable Interrupt 
+
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