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???
10/26/05 22:15
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#102999 - pad pixels
Responding to: ???'s previous message
Jan,

Once again you are "right on the money". I have 2 pad NOPs per pix.

I did do a 320x240 version of the video, but i have been reluctant to implement beyond 32 - 8 pixel wide characters.

This is due to:
1)generality for target TV (i;m using the least expensive i can find).

2)Testing of the addition of a Shift Reg/FIFO combo that would be less dependent upon DS'4x0 (this is my bow to self-conciousness when over-clocking the DS). Where pix clock would be 5.5296MHZ. This would allow more generality for the '52 variant that could be used (but the target is DS'4x0).

3)32 is a nice round number for integrating an external Frame Buffer using PAGE MODE 1. When using this mode with a struct at even page address, and a pointer with post-increment, you place the (additional mem cycle penalty for new page addrs) to a start of line position that you can anticipate and accomodate in the timing.

regards,
p



List of 67 messages in thread
TopicAuthorDate
8051 8-bit computer            01/01/70 00:00      
   (or z80)            01/01/70 00:00      
   8051 computer            01/01/70 00:00      
      I never cringe on a "fun exercise" I do,            01/01/70 00:00      
         awesome?            01/01/70 00:00      
            Computer            01/01/70 00:00      
               8051 Computer.            01/01/70 00:00      
               Minor corrections            01/01/70 00:00      
                  11MHz?            01/01/70 00:00      
                     Not sure            01/01/70 00:00      
                        Congratulations            01/01/70 00:00      
                           Actually it's teh same            01/01/70 00:00      
                        11MHz            01/01/70 00:00      
                        Re: 8051 computer            01/01/70 00:00      
                           Just us            01/01/70 00:00      
                              Project Team            01/01/70 00:00      
                                 me tried            01/01/70 00:00      
                                    thoughts on project            01/01/70 00:00      
                                       What is a true multitasking controller?            01/01/70 00:00      
                                          multitasking controller            01/01/70 00:00      
                                             video            01/01/70 00:00      
                                             continued..            01/01/70 00:00      
                                          continued..            01/01/70 00:00      
                                             I don't think so            01/01/70 00:00      
                                                color display?            01/01/70 00:00      
                                                   Predko Video            01/01/70 00:00      
                                                      yes            01/01/70 00:00      
                                                      video, timing, speeds etc.            01/01/70 00:00      
                                                         Video Timing.            01/01/70 00:00      
                                                            6.2MHz pixel clock?            01/01/70 00:00      
                                                               Pixel Clock            01/01/70 00:00      
                                                                  pix clock            01/01/70 00:00      
                                                                  overclocking            01/01/70 00:00      
                                                                     pad pixels            01/01/70 00:00      
                                                just a suggestion            01/01/70 00:00      
                                                   Speed            01/01/70 00:00      
                                                      DS'4x0            01/01/70 00:00      
                                                      DIP / surface mount            01/01/70 00:00      
                                                         a 100MHz chip in a perf board? methinks            01/01/70 00:00      
                                                Hardware multitasking            01/01/70 00:00      
                                                Multitasking redefined            01/01/70 00:00      
                                             Misplaced self belief...            01/01/70 00:00      
                                                Daunting?            01/01/70 00:00      
                                                breadboarded            01/01/70 00:00      
                                                   TRS-80            01/01/70 00:00      
                                                      TRS80?            01/01/70 00:00      
                                                         in the beginning there was ..            01/01/70 00:00      
                                                         TRS-80 Info            01/01/70 00:00      
                                                            Man those were the days.            01/01/70 00:00      
                                                               That fast?            01/01/70 00:00      
                                                                  More retroinfo            01/01/70 00:00      
                                                                  TRS-80 forward speed.            01/01/70 00:00      
                                                                  Like I said, It was a long time ago            01/01/70 00:00      
                                                               hrm            01/01/70 00:00      
                                                                  TRS80 model 1 speed...            01/01/70 00:00      
                                                         TRS80            01/01/70 00:00      
                                                            You think?            01/01/70 00:00      
                                                               OK so both            01/01/70 00:00      
                                                   No pictures yet            01/01/70 00:00      
                                                      Video Capture Card?            01/01/70 00:00      
                                                         Nope            01/01/70 00:00      
                                                      video output            01/01/70 00:00      
                                                Qui?            01/01/70 00:00      
                                                Multitasking            01/01/70 00:00      
                                                   Real Time and Multi Tasking            01/01/70 00:00      
                                             Maybe whomever has "no idea what I'm tal            01/01/70 00:00      
      It's probably at least fast enough ...            01/01/70 00:00      

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