Rockbox mail archive
Subject: Re: FM Recorder news
From: Andrew Jamieson (ajamiesn_at_optusnet.com.au)
And, of course, Matthew is an absolute legend ...
----- Original Message -----
From: "Linus Nielsen Feltzing" <linus_at_haxx.se>
Sent: Saturday, February 15, 2003 3:33 PM
Subject: FM Recorder news
> Hello everyone!
> We have a new hero in town!
> Matthew P. OReilly wanted me to have a really great birthday so he
> bought me a gift. An FM Recorder 20!!!
> I am speechless! This is the most generous donation this project has
> received so far. Now we can finally start reverse engineering the FM
> I got it today, and immediately took it apart. My findings so far:
> o The FM radio part is encapsuled in a box and hard to take apart. 8
> wires are connected to it:
> o The antenna, which goes to the ground on the headphones
> o The VCC
> o 4 wires go to PB0-2, (LCD control), and PB4 (the OFF button).
> The LCD pins can be used for radio control without interfering with
> the LCD as long as the LCD CS pin is high.
> o 2 wires go to the MAS INL and INR pins, obviously the left and
> right audio channels.
> My guess is that they use Samsung for the FM radio as well as
> the LCD controller, so it is probably the S1A0903X01. I will try
> to verify this by analysing the data on these 4 pins with a logic
> analyzer on monday.
> o It uses 2 LiIon cells i parallel supervised by a Linear LTC1734
> battery charger.
> o It has a Linear LTC1872 step-up DC/DC controller to generate 5V,
> probably for the disk drive.
> o There is a serial EEPROM, looks like a Microchip 24LC02, that is
> connected to the ISD300. This is used for the ATA Identify block
> I will produce some schematics later on, along with detailed pictures on
> the naked device. Stay tuned.
> /The damn thing was pretty touch to take apart. I guess Archos' support
> strategy is to replace broken devices rather than repair them...)
> Time to sleep. Over and out,
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