Rstisr

;--- !!! ASSUMES 8000h-FFFFh is RAM !!! ---

;org 08000h

cmdbuf equ		08000h
pbuffr equ		08020h
;---------------------------------------------------
org		0		; RESET vector
RSTISR		proc	near
jmp		cc_UC, mon		; branch to monitor
RSTISR		endp	near
org		00008h		; NMI vector
NMISR		proc	near
jmp		cc_UC, mon		; branch to monitor
NMISR		endp	near
; --------------------------------------------------
org	01000h
; --------------------------------------------------
; --- monitor program ---
MON proc		near
mov		SYSCON, #0F800h ; #1111 1000

;0000 0000 b nop

mov	SYSCON, #0F800h ; #1111 1000
; 0000 0000 b
nop
; --- initialize CPS -------------------------------
	;0xFA 0x00 0x10 0x80 ; jmps far 1000h ;
(jump to next1) ; far intersegment jump to update CPS
	;next1:
	dw 000FAh
next1:	dw 01010h
next1:
; --- initialize DPPx ------------------------------
mov	DPP0, #0
.
.
( no changes to the code here )
.
.
; --------------------------------------------------	;---	message

strings ---

; --------------------------------------------------

EVEN msggreet:

db 0ah, 0dh, ’SAB-C167 MONITOR IN EPROM > ’, 0

( no changes to the code here )

As mentioned, the address of register SYSCON is different (89h) in the C167. The instruction setting the SYSCON register is a move instruction. In machine code, the instruction takes four bytes: E6h, 89h, 00h, F8h, which may be hand-coded as,

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