Forum Rule: Always post complete source code & details to reproduce any issue!

Search:

Type: Posts; User: Dave47

Search: Search took 0.00 seconds.

  1. Replies
    19
    Views
    271

    I've written some code that makes the T4 look...

    I've written some code that makes the T4 look like a 64K EEPROM and it can read 16 inputs, do a lookup, and write 8 outputs in something like 35ns. The 8 bit digital write looks like this...


    ...
  2. Manitou, thanks for your help! This was...

    Manitou, thanks for your help!



    This was the issue... delayCycles(25) does NOT result in a 42ns pulse at pin 3. 25 looks more like 4-5ns, 60 only looks like 20ns, and 130 does look like...
  3. Replies
    109
    Views
    7,146

    Done! new thread is here... ...

    Done! new thread is here...

    https://forum.pjrc.com/threads/57693-Problems-Synchronizing-an-Interval-Timer-to-a-PWM-on-a-Teensy-4

    David
  4. Problems Synchronizing an Interval Timer to a PWM on a Teensy 4

    For some reason, when I set up the interval timer, I am only getting it to fire once. The code I am trying to update for use with the T4 already works on T3.2, T3.5, and T3.6 with minor timing...
  5. Replies
    109
    Views
    7,146

    I will make note of that. I was using F_BUS for...

    I will make note of that. I was using F_BUS for the previous Teensys, so I just updated when I got an error at compile time.






    I am using 1.48-beta1 at the moment. I got the...
  6. Replies
    109
    Views
    7,146

    I've been following this and thread since I was...

    I've been following this and thread since I was hoping I had a similar problem. Unfortunately, that isn't the case, yet. When I set up the interval timer, I am only getting it to fire once. The...
  7. Thread: New Scope

    by Dave47
    Replies
    25
    Views
    2,041

    I've extensively used a 16900 chassis with a...

    I've extensively used a 16900 chassis with a 16962 card at work. I even wrote a full suite of Labview drivers that fully automated the capture process. I wouldn't buy one for home use, though, also...
  8. Nice work. I have often wondered how fast we...

    Nice work. I have often wondered how fast we could get parallel accesses using the Teensy.

    On #4, ADC manufacturers often suggest a bandpass filter on the clock which cleans up a lot of the...
  9. I'm curious if you mean MB/s (to me this is...

    I'm curious if you mean MB/s (to me this is megabytes per second) or Mb/s (which is megabits per second). Megabytes is at least 8 times harder than megabits and 20 MB/s implies a serial clock of 160...
  10. Just a quick update... I have reworked the...

    Just a quick update...

    I have reworked the board and I now have STEREO! I added 220ohm resistors to all the high speed outputs (to redue or eliminate ringing) and a 74HC139 to decode the CS and...
  11. Replies
    119
    Views
    26,773

    OK. Just wondering. It is one of those things...

    OK. Just wondering. It is one of those things that sounds good, but is impractical. (I apologize if I sound ungrateful. This is an awesome project that is way beyond my abilities.)

    Still, lots...
  12. Replies
    119
    Views
    26,773

    Do you know if this method will handle the...

    Do you know if this method will handle the digitunes like "Polly_Wants_a_Tracker.sid"? It updates the SID about once every 6us. I would also check the voices in Impossible Mission and Ghost...
  13. Replies
    119
    Views
    26,773

    There were plenty of Commodore centric printers...

    There were plenty of Commodore centric printers that could be daisy chained off the same 6 pin serial connector the 1541 used. I had an Okimate 10 color printer that was like this.

    (Rats! ...
  14. Paul, I figured it out. Based on your reply...

    Paul,

    I figured it out. Based on your reply here, I realized that I need to subtract 1 from this line so the counter can end on -1 instead of 0.



    PIT_LDVAL0 = timetonext *...
  15. Replies
    119
    Views
    26,773

    Yeah. I don't think of the PJRC store first. I...

    Yeah. I don't think of the PJRC store first. I probably should start, though.

    Thanks!
    David
  16. Replies
    119
    Views
    26,773

    Frank, The schematic I used is pretty much...

    Frank,

    The schematic I used is pretty much what is in the original datasheet located here:

    http://www.classiccmp.org/cini/pdf/Commodore/ds_6581.pdf

    The timing diagram is pretty good for...
  17. Replies
    119
    Views
    26,773

    This looks like lots of fun! I will be ordering...

    This looks like lots of fun! I will be ordering a display ASAP.

    One question/suggestion... Would it be possible to address a real SID instead of emulating one? I just got a SID player working...
  18. Paul, Thanks for looking at this. I just...

    Paul,

    Thanks for looking at this. I just updated to Arduino 1.8.1 and Teensyduino 1.35.

    I'm not sure if how familiar you are with these SID network players. You can see from the code that...
  19. David's MOS6581 SID network player (Teensy 3.2)

    Hi!

    Longtime lurker here. I have recently been able to get a MOS6581 SID to run as a network player using ACID64 and a program I wrote in LabView to actually work. It works about 95% at the...
Results 1 to 19 of 19