Date   : Mon, 30 Oct 2006 00:24:26 +0000
From   : splodge@... (Richard Gellman)
Subject: poorly master

Jonathan Graham Harston wrote:
> "Richard Gellman" <splodge@...> wrote:
>   
>>> IIRC the disc has to be ADFS.  The machine is trying to load the disc
>>>       
>  
> No, the disk has to be in whatever format the filing system expects.
A3, M3, They both go to London. In other words, thats more or less what 
I said, except I didn't bother restating at that moment that when the 
CMOS is cleared, ADFS *is* the current filing system. Thus if you do a 
standard CMOS clear on a Master, and you don't hold down any FS keys 
(e.g. D for DFS) with BREAK, then ADFS is selected, and of course ADFS 
(at least the one supplied in the Master 128 ROM) expects an ADFS disk.

I am assuming in all this that the Master 128 in question is a standard 
issue, and doesn't have any  weird any wonderful ROMs (maybe excepting a 
fixed DFS ROM that seemed to be quite common) fitted.
>> This is correct. When the Master series has its CMOS cleared, it causes
>> the default filing system to be 0. The ADFS is written such that if nobody
>> else claims the current FS ROM #, ADFS will, so ADFS becomes the default
>>     
>  
> No it's not. ADFS is just like any other filing system.
>  
> If no key is pressed on BREAK, and the configured filing system
> ROM does not contain a filing system, then the filing system in
> the highest numbered ROM selects itself, just as with the BBC.
>  
> ADFS just happens to be the filing system in the highest numbered
> ROM.
>   
Same again. Thats pretty much what I said, but re-worded in a more 
technical context. The underlying point is that on a CMOS clear, the ROM 
specified as the default filing system doesn't contain a filing system, 
and as a result the ADFS gets selected.

There's a little more logic to it than "highest numbered ROM" in the 
Master 128. If that were the case, the Cassette Filing System (in ROM 15 
in terms of CONFIGURE) would be selected in priority to ADFS (ROM 13). 
Either the ADFS is selecting itself, or the CFS is choosing to decline 
selecting itself, in which case control passes to ADFS.

Either way you look at it, on a CMOS reset everything goes to zero, no 
FS corresponds, so by one means or another ADFS gets selected, along 
with directory/boot options  that cause it to expect an ADFS disk.

-- Richard

>> A rough guide to the default config. is in the Master Welcome Guide, if
>> not the following will give you a reasonable configuration:
>>     
>  
> See http://mdfs.net/Docs/Comp/BBC/ReConfig
>  
>