----- Original Message ----- From: "Edson Brusque" To: Sent: Wednesday, February 13, 2002 9:39 AM Subject: Re: [EE]: Car MP3 player. (oh no, again!!!) > Hello Players, > > Bob Blick wrote: > > DOS? Yuck! Don't you have a hard drive size limit and 8.3 names? I > > have full code(PC side and PIC side) if you want to use Linux and a > > serial port. > > > > There are some 486 boards that just plain will not work, something > > about DMA really interferes with being an MP3 player. I'd suggest an > > LPX-format socket-7 motherboard, you can get them for $15 and > > have onboard good-quality sound, video, etc, in a small format. > > right now, I'm starting to think about Linux. The problem with DOS seens Cool, smart move. ;-) It will work good. I actually saw a board on the internet recently (strongarm processor I believe) that actually had a UDMA IDE controller on board and an actual reserved area on the circuit board for attaching a hard drive. Of course, it's way expensive, but ideal for an mp3 player. > to be lack of support for new technologies. There's motherboards with the > AC97 codec, that I though could have decent-quality sound optput. Also, the > onboard ethernet would be very usefull, but will be hard to use these > resources on DOS. Linux, on other side, seens to have drives for these > things. > > Sorry, what's "LPX" format motherboard??? Like the ones that come in low-profile desktops (read as proprietary) that use a "riser" card system for add-on adapter cards. They're kinda big, but a whole lot cheaper than SBC's tend to be. You will have to supply all the weird pc voltages (+5, -5(?), +12, -12). No problem if you have access to ac mains, just use a pc supply (real cheap). > So, my project requirements seens to have changed. I suspect this is normal. ;-D > Byron A Jeff wrote: > >Of course it'll have a PIC based, serial interfaced, control panel. > >Eventually it'll interface to a yet to be written program that will > >interface with a set of scripts that I've written to control the play > >mix on my home PC MP3 player. Commands such as skip, repeat, and find > >are already in the arsenal. Normal mode is to play a continuous random > >playlist. > > I'm currently doing a simple RS232 terminal with a PIC16F628, a 2x40 LCD > and 16 keys. I'll pretend to use this to control the MP3Player. Just 4 wires > GND, 5V, TX and RX between the system case and the control panel/terminal. Should be good enough. > Byron A Jeff wrote: > > Edson, I haven't yet found a cost effective SBC for this project. My > >small box is a Baby-AT Socket 7 MB with onboard sound, video, and > >ethernet, using a 450 Mhz AMD K6. It's mounted in a 11x16x2 inch > >organizing case with the removable buckets. This houses the MB, > >13GB HD, and the zip. The power supply will be external to the case. > > A motherboard similar to the one you're using seens to cost about > US$80,00 here in Brazil. Maybe I could find an used one cheaper with > processor and some memory. > > I'm also melting some neurones thinking about the PSU... > > Byron A Jeff wrote: > >The last interesting item which I haven't implemented yet is LinuxBIOS. > >Essentially you flash a modified Linux kernel onto the motherboard which > >boots directly without all the pesky POST/memory sequences that standard > >BIOSes have. Boots to a running state in less than 10 seconds and can be > >powered down with impunity. Check it out at http://www.linuxbios.org. > > This seens to be very interesting. Please tell us when you got it > working. > > Bob Blick wrote: > >I certainly see the point of a DOS player, but the really cool ones use > >Linux :) > > What software are you using for this? I've seen a player these days for > Linux I think is called XMMS, it's the one you're using? How to make it > interface with keys and LCD on a COM port? > > Best regards, > > Brusque michael brown -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.