Date   : Wed, 26 Sep 2001 11:09:38 -0700
From   : Angus Duggan <angus.duggan@...>
Subject: [RE] BBC B+ 128 question.

Victor Rozanov writes:
>Gordon,
>
>Thank you for your help.
>I have ROMs with OS 1.20 and old Basic.
>I tried them in B+ but the result is the same or almost the same.
>What I can imagine is that some games touch the memory areas where
>the additional memory registers located and corrupt their state.
>Another posibility is the 1770 DFS 2.22.  According to my knowledges
>the BBC B had 8271 controller and it was the different DFS for that.
>That DFS used much less system memory for its work. And one more thing.

That's true. DNFS 1.2 (the most common DFS for 8271 controllers) has areas of
memory as low as &1100 which are (ab)used by some games, Elite included.

>I think the jumpers on the keyboard mean something when the game is trying
>to recognize what type of computer it is. May be I am wrong. These are

Nope. The jumpers on the keyboard give startup Mode, and DFS timing settings.

a.