Date: Tue, 11 Nov 2003 17:32:25 -0800 From: PhotoEngineering <[EMAIL PROTECTED]> Subject: Re: [LIB] USB
At 04:23 PM 11/11/2003, you wrote:
Date: Wed, 12 Nov 2003 08:16:54 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: [LIB] USB
At 03:16 PM 11/11/2003 -0800, you wrote:Date: Tue, 11 Nov 2003 14:59:45 -0800 From: PhotoEngineering <[EMAIL PROTECTED]> Subject: USB
I was looking at the board specs of the Libretto 100/110CT and according to Toshiba the USB controller is acuallly in the I/O GA. So a USB jack be simply wired into the CPU board it seems.
I had a look at this a while back when I was bringing the PS/2 port lines out from the motherboard PS/2 controller (details of which are available at www.raybot.net in case anyone was remotely interested!), yes the USB controller is on the motherboard but the USB driver chip (and, from my limited experience with USB driver chips, at least some of the smarts for current control, etc.) sit in the EPR ... I was going to try doing this once I got a few spare moments to read up on the chips involved but if you're more familiar with the way USB driver circuits work I'll leave it to you! :-)
Yes the port would need a driver chip but I believe that is all it would need. I haven't seen chips for just one port usually a minimum of two but that would be a miner hookup if a person wasn't afraid of soldering:-). The important thing is the controller is already there which means a lot in that the job is almost completely done. It could be tied right to the docking port where the pinout is known.
A somewhat easier mod I was also thinking of doing was bringing out the RS-232 port (the raw signals are there, all it needs is the RS-232 line driver and a few capacitors, both of which I actually understand :-) ) ...
As for a modem on the audio chip, are you sure that audio chip has an inbuilt modem and you're not looking a modem line input (which is probably already routed to a line on the PCMCIA port for connection to a PCMCIA modem)? The data sheet I have for that chip mentions its multipurpose I/O line can be configured as a modem interface (or a 16-bit address decode, EEPROM interface, ZV port interface, CPU/DAC interface or IDE CD-ROM interface) and has 3 signals (chip select, interrupt and analog input) but I don't think it actually has a hardware modem onboard.
Which data sheet are you looking at? The 110CT I have has a YMF715F-S in and I did find the data sheet for the S chip on the web. It looked like the modem would have to be programmed and I don't know what all Toshiba used but it did look like once the modem had been programmed you would just need to hook up the Rx and Tx lines directly to two I/O lines.
On another note--
Some good news. The line in on the chip is not being used by Toshiba for anything so all a person needs to do is connect a jack and you can have stereo line in and bypass the mono mic input. One thing about recording from the mono mic is you should use a mono cable from the audio equipment. Stereo from a stereo input will put voltage on the mic out which causes noise. Toshiba used a 5 pin line in jack for the head phone connector but don't worry about matching it. A 3 pin stereo will do. 2 pins are for adjusting the volume of external speakers and can either be hooked up or not. Just tie each one to a channel. They don't work anyway (at least on my speakers which aren't set up for external adjustments. The mic input is just a 3 wire--in and out and ground. Toshiba used a 5 pin but two are not connected.
I'm getting pretty good ripping from a program called Audio Playback Recorder. It rips from just about any input and converts directly into MP3 or wave. The MP3 isn't bad but a little trebly. Wave is much better if you use another program like the Real Player file converter to turn it into a MP3. With APR I really haven't been able to go above 128k because it uses quite a bit of CPU and the higher ones come out choppy. With wave though I can go as high as 48k. Real coverts at any bit rate up to 320 though without it being choppy at all and it sounds good. I like using APR to rip since it makes a new file every time a new song starts, which other recorders don't do (at least I haven't found one yet). Means you don't have to sit there starting and stopping the damn recorder every time a new song starts:).
John [EMAIL PROTECTED]
- Raymond
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