#!/usr/local/bin/zasm -o original/
; ================================================================
;	Example file with target 'sna'
;	NMI snapshot for ZX Spectrum 16k or 48k
;	Copyright  (c)	Günter Woigk 1994 - 2015
;					mailto:kio@little-bat.de
; ================================================================


; assembler should check
; - that the first segment is 27 bytes
; - that no data segment is defined
; - that total segment size is 0x4000 or 0xc000 bytes
; space is filled with 0x00
; segments have no flags


#target sna


; ---------------------------------------------------
;		.sna header: saved registers
; ---------------------------------------------------

#code HEAD, 0, 27
		defb    $3f         	; i
		defw    0		     	; hl'
		defw    0		     	; de'
		defw    0		     	; bc'
		defw    0		     	; af'

		defw    0			   	; hl
		defw    0			   	; de
		defw    0			   	; bc
		defw    0			   	; iy
		defw    0			   	; ix

		defb    0<<2         	; bit 2 = iff2 (iff1 before nmi) 0=di, 1=ei
		defb    0,0,0       	; r,f,a
		defw    stackend		; sp
		defb    1           	; irpt mode
		defb    7           	; border color: 0=black ... 7=white



; ---------------------------------------------------
;		contended ram: video ram & rarely used code
; ---------------------------------------------------

#code SLOW_RAM, 0x4000, 0x4000

pixels_start:	defs 0x1800
attr_start:		defs 0x300

code_start:
	; define some rarely used machine code here
	; e.g. initialization code

			jr	$


; ---------------------------------------------------
;		fast ram: frequently used code,
;		variables and machine stack
; ---------------------------------------------------

#code FAST_RAM, 0x8000, 0x8000

stackbot:	defs 	0xfe
stackend:	defw 	code_start	; will be popped into pc when the emulator loads the .sna file


; define some variables here

; define some machine code here