Date   : Sat, 21 Mar 2009 10:50:08 +0000
From   : beeb@... (Kris Adcock)
Subject: Flash card without custom ROM?

me@... wrote:
> Are there any flash card interfaces for the Micro/Master that use  
> standard DFS or ADFS? ie. Which don't require a custom ROM?
> 

Well, as the DFS ROM talks to the 8271/1770 controller, that would mean 
building an interface that connected AFTER this. Which amounts to a 
project to effectively emulate a floppy drive, doesn't it?

Which would actually be quite an interesting project, and potentially 
useful for any old computer with a floppy-interface - a box with a 
display on it so that you could page through a selection of virtual 
floppy images, and the computer would know no different. However, the 
circuit you'd be building would effectively be reversing quite a lot of 
what the FDC controller was doing, so it would be a bit of a waste.

I suppose you could make a drop-in circuit that pretended to be an 8271 
(so: replace the 8271 with a board that pretends to talk to a floppy 
drive, and just use data on an SD card instead) but then you might as 
well just replace the DFS with something that reads from the userport 
(like mmbeeb) or do it how GoMMC does it.

Cheers,

Kris.