Date   : Tue, 04 Feb 2014 15:19:42 +0100
From   : eelco@... (Eelco Huininga)
Subject: Custom 68k co-pro BIOS (Was: Where is everyone?)

Hmm, the correct link is 
http://acorn.huininga.nl/pub/projects/68k%20BIOS/bios.X68

Cheers,
Eelco


Eelco Huininga schreef op 4-2-2014 14:43:
> Hi,
>
> No problem, I've put it online at
> http://acorn.huininga.nl/pub/projects/68k%20BIOS/bios.x68
>
> Now that I see it again it makes me realise that there's still some work
> to be done, and that there probably are still some bugs in there. I've
> used a 68k emulator (EASy68k) for testing, and basic I/O (OSWRCH,
> OSRDCH, OSCLI etc.) should work; good enough to bring the co-pro to
> life. The BIOS uses IRQ5/IRQ7 as IRQ/NMI lines for the TUBE-processor so
> that the BIOS can also be used for 68008 CPU's. I think I'll also put
> the hardware online soon.
>
> There's some code in there for making SWI-compatible calls via the TRAP
> 14 instruction. The idea behind this was to offer some kind of
> SWI-compatible API, but this is all in a very, very immature state.
> Further expansion could be Apple or Amiga API-support, but that would
> probably only be completed in another eon or two :-)
>
> The OR.B #$FF instructions at reset_entry are only there to initialise
> the emulator. They're removed when flashing the EEPROM.
>
> If you (or anyone else) have any suggestions or questions I'd be happy
> to hear them.
>
> Cheers,
> Eelco
>
>
>
> J.G.Harston wrote on 1-2-2014 11:42:
>> Eelco Huininga wrote:
>>> One of them is a 68030/68882 co-pro board. I've populated the circuit
>>> board, but there's a design error in the board which I have to
>>> correct.
>>> The software is finished, but it'll probably 2020 when I'll finish
>>> the
>>> whole thing :-)
>> It would be nice to have the opportunity to nosey around the software.
>> :)
>>
>
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