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| From: indi (all posts)
Date: 2001-03-15
Subject: Re: 1551 turbos... how they work?
|
On Wed, 14 Mar 2001 16:50:47 +0100 (CET), you wrote:
>Mike Dailly <mike@dailly.org> írta:
>
>> do is read the D64 file and make it GCR into the DMA
>> buffer, then the
>
>Do you have any URLs handy on this format? I guess you've
>been refering to the G64 format here...? Also, are there
>any utilities for dumping disks to the G64 format? (Lando
>owns the original disk version of Mercenary, which seems to
>have some copy protection in it...)
Sorry no... I have the old "Anatomy of the 1541" book - its all in there....
>> get the COMMS going between both machines, this should
>> also be easy,
>
>Yeah, after all we have a complete CPU emulation already ;-
>) Seriously, peeking into the disassembly of the 1551 ROM
>it seemed that it uses the memory area $4000-$4004 for
>communication with the plus/4. So, on the other side, this
>should be mapped to the $FEF0-2 addresses somehow (maybe
>not?).
Im not sure on the 1551's memory layout... And I can't find my book at the moment - room is a mess :-) But from what I remember it has about
2-8K or ram(ish) and some comm lines somewhere... but until I find the book to refresh my memory.... no idea. You could try the VICE source... The All games must work with the 1541 as well, so perhaps you should get that working first? Theres loads of info on this about the NET - VICE being a good place to start I'd think...
Mike
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