Date   : Thu, 06 Oct 1994 17:05:35 +0100 (BST)
From   : Mark Cooke <ee2015@...>
Subject: Re : BBC Disks

Chris,

> > My emulator is still lacking any (decent) file I/O - I'm in the process of
> > adapting a rom filing system written on the Master is about '86 to do
> > breaks to my emulator for disk access.
> 
> Yes, I think that's what I'll do. BTW, is yours going to use BBC disks? I 
> thought I'd just intercept sector read/writes and let ADFS do its own filing.
> 
> +-------------------+-------------------------------------------------+
> | /-- |_| /-- | (~  | "And the driving is like the driving of Jehu,   |
> | \-- | | |   | _)  | the son of Nimshi, for he drives furiously."    |
> +-------------------+-------------------- Second Book of Kings 9 v20 -+
> |  Wanted: 486DX2-66 VLB M/board; VLB graphics card; SBpro soundcard  |
> +---------------------------------------------------------------------+
> 

Hum.  I wasn't sure about exactly how I'm going to do the I/O bit.  I
think it may be a right royal pain to get BBC disk images into the PC. 
However, my initial plans were just to emulate the sector R/W's for DFS
and ADFS, and write a bunch of utilities in an extra rom to :

1. Load an image from the PC filing system, and set it's load/exec/name
   addresses.  Then change to ADFS and write it out.

2. 'Mount' BBC disk images. (ie swap disk images ADFS points at)

3. Take snapshots of my emulator state and use these to restore the screen.

Any thoughts about this are welcome.

Mark.

PS. There's a chap asking about BBC emulators in comp.emulators.misc.  I
posted some info about my emulator, but could not find the complete list. 
Could you mail it to him (and me). Ta.

 -- 
Mark Cooke                         EMail : ee2015@...
Electronic Engineering             Snail : Room 2 Library Block
Badock Hall Net-Rep &                      Badock Hall
Data Safety Officer                        Stoke Park Road