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Re: The MoDapple Thread was Re: An emulator concept... [message #333854 is a reply to message #333850]

Fri, 09 December 2016 02:37

Steve Nickolas
Messages: 2036
Registered: October 2012

Karma: 0

Senior Member

On Thu, 8 Dec 2016, Antoine Vignau wrote:

> A edd file is a set of 16384 bytes per phase.
> See each stream as 0's and 1's.
> You must simulate the logic state sequencer of the controller card. The first step is synchronization, read and translate JPL's message at http://www.hackzapple.com/DISKII/DISKIITECH04.HTM
>
> And some edd info at http://www.brutaldeluxe.fr/products/apple2/imfEDDup/
>
> Antoine
>

I managed to get as far as being able to convert them to NIBs on my own
rather than through defedd.

It looks like adding EDD support may require writing a new disk driver,
because the existing drivers don't seem to operate at that low a level.

-uso.

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Re: The MoDapple Thread was Re: An emulator concept... [message #333897 is a reply to message #333854]

Sat, 10 December 2016 02:41

Antoine Vignau
Messages: 1860
Registered: October 2012

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drivers mainly work at the nib level. See open emulator, it works at the bit level through its fdi support

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Re: The MoDapple Thread was Re: An emulator concept... [message #333898 is a reply to message #333897]

Sat, 10 December 2016 03:02

Steve Nickolas
Messages: 2036
Registered: October 2012

Karma: 0

Senior Member

On Fri, 9 Dec 2016, Antoine Vignau wrote:

> drivers mainly work at the nib level. See open emulator, it works at the
> bit level through its fdi support

And it would be possible for me, at least in theory, to do the same, but
at first it might have to be a separate DLL from the code that currently
does DSK and NIB, because I don't think that code can be trivially
modified to work at a lower level.

I haven't yet figured out how to pull it off.

-uso.

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