Re: 17xx Routine Help

From: groepaz_at_gmx.net
Date: Wed, 12 Oct 2016 10:59:07 +0200
Message-ID: <1559946.HJY0y4dTpQ@rakete>
On Wednesday 12 October 2016, 08:44:33 Marko Mäkelä <msmakela@gmail.com> 
wrote:
> On Tue, Oct 11, 2016 at 11:57:33PM -0400, Nick Vivid wrote:
> >Is there anything I'm obviously doing wrong in this routine?
> 
> Yes:
> >   reutoc642 lda #$b1
> >            sta $fd01
> 
> $fd01 is not a magic address recognized by the REU. Maybe you meant
> $df01, which was used elsewhere in the program.
> 
> IIRC, apart from the $dfxx range, the REU is also sensitive for writes
> to $ff00, to allow convenient bank selection with the C128 MMU.
> 
> A long time ago, I wrote some REU routines for cbmlink. You can have a
> look at cbmlink/cbmsrc/mem/reubase.s.

or look at the VICE testrepo which also has a couple simple REU related 
programs: https://sourceforge.net/p/vice-emu/code/HEAD/tree/testprogs/REU/

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