Re: 6809 in a C64

From: groepaz_at_gmx.net
Date: Wed, 23 May 2018 16:00:18 +0200
Message-ID: <2204196.4izhLEVfrN@rakete>
Am Mittwoch, 23. Mai 2018, 15:50:03 CEST schrieb Mia Magnusson:
> Den Wed, 23 May 2018 15:22:44 +0200 skrev Konrad B
> 
> <konrad0x42@gmail.com>:
> > 2018-05-23 14:35 GMT+02:00 Steve Gray <sjgray@rogers.com>:
> > > Very cool! FYI, the Commodore 64 BTX cartridges also contain a
> > > 6809, but i haven't seen schematics for them anywhere. They also
> > > have their own video chip. Other than that, there's really not much
> > > info out there about them.
> > 
> > "BTX Decoder Modul II", the one in REU-like case, has the 6803 MPU and
> > is interfaced to the "main CPU" with the 68HC34 dual port RAM.
> 
> Why were it made that way?
> 
> Did the German BTX have some fancy features that the British
> (Viewdata?) and Swedish Teledata never had?

IIRC it originates from typical german regulations - ie "software" decoders 
were illegal at the beginning, only certified devices were allowed to be used 
with BTX.

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<Antitrack/Legend>
Received on 2018-05-23 17:00:02

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