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        ;; *******************************************************************

        ;; $Id: test.asm,v 1.1 2005-10-31 10:05:13 arniml Exp $

        ;;

        ;; Test interrupt on code in Program Memory Bank 1.

        ;; => Bug report "Problem with INT and JMP"

        ;; *******************************************************************

        INCLUDE "cpu.inc"

        INCLUDE "pass_fail.inc"

test_byte:      equ     020h

        ORG     0

        ;; Start of test

        jmp     start

        ;; interrupt hits djnz instruction with opcode 0EAh

        ;; bus conflict results on interrupt vector address 002h

        ;; -> retr instruction placed here, so test finds FAIL

        retr

        ORG     3

        ;; interrupt executed

        mov     r0, #test_byte

        mov     a, #0ffh

        mov     @r0, a

        retr

start:

        ;; enable interrupt

        en      i

        ;; clear test byte

        mov     r1, #test_byte

        clr     a

        mov     @r1, a

        call    program_memory_bank_1

        sel     mb0

        ;; check if interrupt was successful

        mov     a, @r1

        jz      fail

pass:   PASS

fail:   FAIL

        ORG     0800H

program_memory_bank_1:

        ;; spend some time and wait for interrupt

        mov     r2, #020h

        djnz    r2, $

        ret