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Jeff Corr
10/21/05 02:28
Read: 816 times


 
#102710 - thoughts on project
Responding to: Oleg Sergeev's previous message
I think its important to remind ourselves though that the 8051/2 is not a true multitasking microcontroller; and if syncing it to the video is absolutely required, wouldn't executing other tasks (ie : programs to run on it, the OS, NIC, sound card) interupt this and cause glitches in the video.

From a challenging standpoint, its amazing you could get that processor to do all of that at once, and I am still amazed to be honest; but from a practicality/speed standpoint I still think one 8051 dedicated for the video would be best; that way we could change specs on the system processor (such as speed and memory, as well as large amounts of programming and the OS without it affecting the second cpu (video). If the main processor was a Silabs chip running at 100Mhz, and it could communicate serially with the video for displaying text, I think it would be easier to mess with - and nobody would ruin the video output tweaking the programming.

I also think its very important to have some type of sound system on it; as this should be relatively easy to interface.
Lets face it, if your already planning on interfacing a FAT file system in a memory card to it, why not add a 16-bit DAC with onboard preamp and optional line out... if you could get this RTOS to run and load/play mp3s and wavs out through the DAC, I would thoroughly be impressed. Years ago I actually used an 8-bit DAC and a bunch of gates to create a very rudementary soundcard for an ISA bus.

I'd like to help anyway I can as well, and by the large number of replies I think this project has alot of backing and support.

Speaking of which, Craig, how is the 8051 communicating with all of these devices? Are you dedicating IO pins/ports to specific hardware, or are you using an 8bit address, 8 bit data bus from ports 1,3?

List of 67 messages in thread
TopicAuthorDate
8051 8-bit computer      Jeff Corr      10/19/05 06:09      
   (or z80)      Jeff Corr      10/19/05 06:10      
   8051 computer      Craig Steiner      10/19/05 08:05      
      I never cringe on a "fun exercise" I do,      Erik Malund      10/19/05 08:21      
         awesome?      Jeff Corr      10/19/05 11:09      
            Computer      Craig Steiner      10/19/05 11:45      
               8051 Computer.      Arif Deshmukh      10/19/05 11:57      
               Minor corrections      Craig Steiner      10/19/05 20:31      
                  11MHz?      Jan Waclawek      10/20/05 00:59      
                     Not sure      Craig Steiner      10/20/05 08:07      
                        Congratulations      José Félix Díaz Ivorra      10/20/05 11:25      
                           Actually it's teh same        Craig Steiner      10/20/05 12:38      
                        11MHz      Phillip M Gallo      10/20/05 11:33      
                        Re: 8051 computer      Valentin Angelovski      10/20/05 18:37      
                           Just us      Craig Steiner      10/20/05 21:12      
                              Project Team      Sriharsha Vedurmudi      10/21/05 00:42      
                                 me tried      Oleg Sergeev      10/21/05 01:13      
                                    thoughts on project      Jeff Corr      10/21/05 02:28      
                                       What is a true multitasking controller?      Russell Bull      10/21/05 03:54      
                                          multitasking controller      Jan Waclawek      10/21/05 04:05      
                                             video      Oleg Sergeev      10/21/05 06:30      
                                             continued..      Jeff Corr      10/22/05 19:37      
                                          continued..      Jeff Corr      10/22/05 19:35      
                                             I don't think so      Craig Steiner      10/22/05 20:02      
                                                color display?      Jeff Corr      10/22/05 21:36      
                                                   Predko Video      Phillip M Gallo      10/22/05 23:17      
                                                      yes      Jeff Corr      10/23/05 13:38      
                                                      video, timing, speeds etc.      Jan Waclawek      10/25/05 10:28      
                                                         Video Timing.      Phillip M Gallo      10/25/05 14:36      
                                                            6.2MHz pixel clock?      Jan Waclawek      10/26/05 01:20      
                                                               Pixel Clock      Phillip M Gallo      10/26/05 11:39      
                                                                  pix clock      Phillip M Gallo      10/26/05 15:10      
                                                                  overclocking      Jan Waclawek      10/26/05 15:20      
                                                                     pad pixels      Phillip M Gallo      10/26/05 16:15      
                                                just a suggestion      Erik Malund      10/24/05 11:54      
                                                   Speed      Craig Steiner      10/24/05 13:22      
                                                      DS'4x0      Phillip M Gallo      10/24/05 17:26      
                                                      DIP / surface mount      Jeff Corr      10/24/05 19:32      
                                                         a 100MHz chip in a perf board? methinks      Erik Malund      10/25/05 06:33      
                                                Hardware multitasking      Sasha Jevtic      10/24/05 17:49      
                                                Multitasking redefined      Dan Henry      10/25/05 06:55      
                                             Misplaced self belief...      Donald Catto      10/24/05 03:01      
                                                Daunting?      Andy Neil      10/24/05 04:08      
                                                breadboarded      Jeff Corr      10/24/05 12:05      
                                                   TRS-80      Andy Neil      10/24/05 13:07      
                                                      TRS80?      Jan Waclawek      10/24/05 14:45      
                                                         in the beginning there was ..      Erik Malund      10/24/05 14:52      
                                                         TRS-80 Info      Phillip M Gallo      10/24/05 14:54      
                                                            Man those were the days.      Jon Ledbetter      10/24/05 15:22      
                                                               That fast?      Craig Steiner      10/24/05 16:00      
                                                                  More retroinfo      José Félix Díaz Ivorra      10/24/05 16:49      
                                                                  TRS-80 forward speed.      Phillip M Gallo      10/24/05 17:11      
                                                                  Like I said, It was a long time ago      Jon Ledbetter      10/25/05 07:48      
                                                               hrm      Jeff Corr      10/24/05 19:16      
                                                                  TRS80 model 1 speed...      Rob Vassar      10/24/05 19:47      
                                                         TRS80      Jan Waclawek      10/25/05 07:55      
                                                            You think?      Craig Steiner      10/25/05 08:38      
                                                               OK so both      Jan Waclawek      10/25/05 10:30      
                                                   No pictures yet      Craig Steiner      10/24/05 13:27      
                                                      Video Capture Card?      Jon Ledbetter      10/24/05 13:31      
                                                         Nope      Craig Steiner      10/24/05 13:47      
                                                      video output      Jeff Corr      10/24/05 19:27      
                                                Qui?      Rob Vassar      10/24/05 18:45      
                                                Multitasking      Grant Beattie      10/25/05 10:44      
                                                   Real Time and Multi Tasking      Ian Bell      10/25/05 15:47      
                                             Maybe whomever has "no idea what I'm tal      Erik Malund      10/24/05 11:51      
      It's probably at least fast enough ...      Richard Erlacher      11/11/05 00:04      

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