Date   : Tue, 07 Oct 2008 21:50:54 +0100
From   : afra@... (Phill Harvey-Smith)
Subject: *CONFIGURE Q

re-posting my original request cause I meant to send it to the list as
well.....

michael.firth@... wrote:
>> -----Original Message-----
> BeebEm (at least recent versions) actually have both the 3.20 and 
> 3.50 ROMs available, have a look in the 'Readme' for how to switch 
> between them.

I noticed them after I posted, I'll, try patching the BeebEm ones
together into a single rom file, like Mess expects and do a binary
compare to see if they are identical.

I have now done this and they are identical.

> BeebEm running 3.50 ROMs also has the same behaviour as you report, 
> while my real Master, which has a 3.50 upgrade purchased from eBay 
> works fine.
> 
> Thus either the version of the OS ROMs in the two emulators is 
> corrupted, or something is lacking in the hardware emulation which 
> 3.50 needs and 3.20 doesn't.

It could I suppose be either (or both), I guess if they where working
from the same MOS image, or writing the emulation from the same hardware
documentation, though I think the latter is less likely as I guess the
Mess driver and BeebEm where written by different people.

I did try replacing the MOS 3.5 roms in Mess with 3.20 and that worked
as expected in mess also.

I know BeebEm is probably a better emulator for actually running
software, but I find the debugger in mess easier to use for development,
and am more familliar with it haveing used it to develop code for the
Dragon/CoCo machines also :)

> I'll try and get the 3.50 code sucked from my real Master tomorrow to
>  try and compare with the BeebEm image.

I'll check to see what my 2 Masters machines have, I checked and they 
both have 3.20, however I just knocked up a flash adapter an a piece of 
stripboard and put the 3.50 from mess on it, installed it into my one of 
my Masters and it seems to work fine, sooo, it looks like it's an 
emulator bug which is odd to say the least !

BTW, the Master I tried it in I had to replace the Master PSU with as 
spare BBC-B PSU, there shouldn't be any problem with this should there I 
  think they are rated about the same ?

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.