COSMAC VIP documentation (was Re: Need help finding old IBM PC game)

From: Pete Turnbull <>
Date: Tue Aug 20 16:37:00 2002

On Aug 19, 20:45, Ethan Dicks wrote:
> --- Sellam Ismail <> wrote:
> > On Mon, 19 Aug 2002, Ethan Dicks wrote:
> >
> > > One of my ultra-low priority projects is to locate the tape, slurp
> > > it into a modern machine and cut MP3s of the programs and see if I
> > > can use my Rio PMP300 (or portable CDDA/MP3 player) as a load device.
> >
> > MP3 won't work. I've tried it. Also, I've been told it won't by
> > who know better than me that it is too lossy.
> Have you tried monsterously large bitrates? I have no personal
> experience with it, but I can see your point about lossiness.
> I'm just curious if it's possible no matter what the file size.
> > Use a straight WAV file recording instead.
> My fallback is 44100 KHz audio files and a portable CD player.

I found a couple of MP3 files for my Exidy Sorcerer on the web, and they
loaded fine at 1200 baud. I suppose the success rate depends on the
quality of design of the cassette interface, and the bit rate in the MP3.
 mpg123 tells me that Galaxians.mp3 is MPEG 2.0 layer III, 16 kbit/s, 22050
Hz mono, it's 520kB long, and "plays" for 1 min 25 secs, including the

I've heard of other people using MP3 files for BBC micros at 1200 baud too.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Tue Aug 20 2002 - 16:37:00 BST

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