Hi all,

I'm playing around a bit with Z80 assembly (with practically no experience), using sjasm on linux, but every time I try to execute the created binary file (bload"t1.bin",r), I get a "Bad file mode" message, both in openMSX and on my real MSX. I've compiled my source as follows: sjasm -l t1.asm t1.bin

Can anyone tell me what I am doing wrong?

thanks

Does your source start with a header like this one?

  byte 0feh
  word start
  word end-1
  word start

  org 0c000h

start:
  nop
  ret
end:

I was missing parts of that, but now it works, thanks!

Okay, so now I can execute my compiled code. However, things are not working as I would, perhaps somewhat naively, expect...

The following code is supposed to draw two lines and give two beeps, using routines in the (sub)rom. The first set is in the main loop, the second in a subroutine which is called from the main loop. But it appears the second is never executed. No second beep, no second line.... The subroutine does show up in the symbol list and label table produced by sjasm, however.

Could anyone tell me what I'm doing wrong?

        byte 0feh
        word start
        word end-1
        word start

        org 0c000h

start:  ld a,5          ; screen 5
        ld ix,#00d1     ; CHGMOD
        call #015F      ; extrom -> call subrom routine in ix

        ld bc,204       ; end coordinates
        ld (#fcb3),bc
        ld bc,50
        ld (#fcb5),bc

        ld bc,50        ; start coordinates
        ld de,161

        ld a,8          ; color
        ld (#F3F2),a
        ld a,0          ; LOGOPR
        ld (#FB02),a

        ld ix,#0085     ; DOGRPH
        call #015f      ; EXTROM

        call #00c0      ; beep

        call #009f      ; chget: wait for input

        call putlin

        call #009f      ; chget: wait for input

        ld a,0          ; screen 0
        ld ix,#00d1     ; CHGMOD
        call #015F      ; extrom -> call subrom routine in ix

        nop
        ret
end:

putlin: call #00c0      ; beep

        ld bc,204       ; end coordinates
        ld (#fcb3),bc
        ld bc,161
        ld (#fcb5),bc

        ld bc,50        ; start coordinates
        ld de,50

        ld a,15          ; color
        ld (#F3F2),a
        ld a,0          ; LOGOPR
        ld (#FB02),a

        ld ix,#0085     ; DOGRPH
        call #015f      ; EXTROM

        ret

Oh I get it... it's because the code of the putlin routine is after the end label and thus after the ending address as indicated in the header.