disassembled Dragon 32 ROM ?

[tormod]

I updated the Makefile so that it works with lwasm from LWTOOLS. I confirmed it builds a 100% identical Dragon 32 ROM image.

[KenH]

Wow, there you go. Was this available on the internet somewhere?

Right here on this forum! It was Phill's Christmas 2011 gift

viewtopic.php?f=7&t=560&p=2988#p2986

But easy to miss because of the thread's somewhat unrelated title.

The source for DragonDos and SuperDos is also there.

[jedie]

Have now done this:

Code: Select all

./6809dasm.pl org=0x8000 forceorg=0x8000 end=0xbfff d32.rom >d32.rom.asm

Then i add comments into d32.rom.asm by a Python script ( https://gist.github.com/jedie/6573808 ) and use the information from viewtopic.php?f=8&t=4365

result is here: https://gist.github.com/jedie/6573826
complete diff: https://gist.github.com/jedie/6573826/revisions

[jedie]

result is here: https://gist.github.com/jedie/6573826

That's nice. But really nice is a full commended ROM list, like: https://github.com/jedie/DragonPy/blob/ ... BasROM.LST

Something like that doesn't exist for Dragon ROM, isn't it?

Again, the UNRAVELLED contains full commended ROM code. But this is from CoCo...

But the ROM code should be very similar, isn't it? So it makes sense to compare it and reuse the commends from the other lists, if the opcode are the same in one block?
Has someone done this in the past?

[jedie]

Again the Question: Has anyone a better disassembled D32 ROM ? Better one as: https://gist.github.com/jedie/6573826 ?

[sorchard]

Hi Jedie,

It's not exactly what you asked for but I've found my own disassembly of the D64 32K mode ROMs. I did this about 15 years ago when it seems I must have had a lot of time on my hands

There is also a binary comparison of the D64 32K mode ROMs versus the D32 ROMs. This file will tell you if the area of interest differs between the two machines. That said, the differences aren't that big.

Hope it's of some use.

Edit: Added D32 ROM disassembly

[tormod]

Stew, that's great. One of the best commented disassemblies I have seen.

Jedie, did you check out Phill's disassembly?

I think there is a certain reluctance around to posting disassemblies of the ROM because of the unclear copyright situation.

[zephyr]

It's not exactly what you asked for but I've found my own disassembly of the D64 32K mode ROMs. I did this about 15 years ago when it seems I must have had a lot of time on my hands

Thanks!

[jedie]

Stew, that's great. One of the best commented disassemblies I have seen.

Yes, it's very good!
i'm not yet clear how the D32 <-> D64 ROMDIFF.TXT worked.

Jedie, did you check out Phill's disassembly?

Yes, but it seems that the work from stew is better

I think there is a certain reluctance around to posting disassemblies of the ROM because of the unclear copyright situation.

The ROMs are download able in archiv. So why not put a disassembly into the Wiki?

[JeeK]

Again the Question: Has anyone a better disassembled D32 ROM ? Better one as: https://gist.github.com/jedie/6573826 ?

Caution! Sorry, but this listing is not complete. Just an example:

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L_942D    lda    <$50            ; $942d: Jumped to from GIVABF routine at 8c37-8c3f - returns 16 bit value in FAC to BASIC ??
L_9431    stb    <$4f
    jmp    L_9161
L_9441    ldb    ,x
    beq    L_9418
    bmi    L_941C
L_944B    ldb    <$4f

compared to the (complete, but undocumented listing)

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L_942D  lda     <$50
        suba    #$80
L_9431  stb     <$4f
        ldd     <$8a
        std     <$52
        sta     <$63
        sta     <$54
        jmp     L_9161
        clr     <$54
        rts
L_9441  ldb     ,x
        beq     L_9418
        ldb     1,x
        eorb    <$54
        bmi     L_941C
L_944B  ldb     <$4f