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From 06/02/2018 to 07/01/2018

06/21/2018

09:44 PM Bug #67: Pokey two tone timing problem
I found if I pokey 53775,11+128 on the Atari then it matches the Eclaire output. Unfortunately forcing the serious ou... foft

06/20/2018

10:03 PM Bug #67: Pokey two tone timing problem
So, errr identical then! Going to have to think about this one...
B is Atari, A is EclaireXL.
!http://www.64kib...
foft
09:57 PM Bug #67: Pokey two tone timing problem
Nope, seems to be some interaction with the noise filtering. I wonder if the delay also needs applying to the pulse f... foft
09:27 PM Bug #67: Pokey two tone timing problem
A 2 cycle delay on the reset fixes both the 4 cycle and the 9 cycle case.
Now to check this specific example!
foft

06/19/2018

09:55 PM Bug #67: Pokey two tone timing problem
I was concerned that my clocks were off at first since I was running in VGA mode, but that changes vsync slightly (50... foft
09:54 PM Bug #67: Pokey two tone timing problem
Been measuring cases on the scope...
Confirmed the extra cycle delays described in that forum post on my 600XL. Co...
foft

06/14/2018

08:35 PM Bug #67: Pokey two tone timing problem
Related post: http://atariage.com/forums/topic/118448-implementation-of-pokey-2-tone-filter-in-emulation/page-3#entry... foft

06/11/2018

09:09 PM Feature #65: Implement ATA to SPI bridge
What is used in set features?
0xef set features, then set feature 1 + lba mode?
Think this can probably be igno...
foft
09:04 PM Feature #65: Implement ATA to SPI bridge
Identify:0xec
0->SCNT,SNUM,CYLL,CYLH
0xa0->HEAD
0xec >STAT
read stat -> if 0 then does not exist! Then wait for B...
foft
08:53 PM Feature #65: Implement ATA to SPI bridge
https://wiki.osdev.org/ATA_PIO_Mode
Probably want at least DRQ(3/ 1=ready), RDY(6 /1=good) and BSY(7/ 0=not busy) ...
foft
08:40 PM Feature #65: Implement ATA to SPI bridge
Some links..
https://www.pjrc.com/tech/8051/ide/wesley.html#idereg
http://atariage.com/forums/topic/279232-fujiconv...
foft
08:32 PM Feature #71: Add support for user firmware updates
foft wrote:
> Add support to load new firmware from sd card. Then it can be applied immediately for testing or flash...
sadosp
08:24 PM Feature #71 (New): Add support for user firmware updates
Add support to load new firmware from sd card. Then it can be applied immediately for testing or flashed.
I'd like...
foft

06/10/2018

09:00 PM Feature #70: Add hotkeys for video mode selection
foft wrote:
> I think its on the right windows key, checking...
I have to see keyboard with two windows keys many...
sadosp
08:52 PM Feature #70: Add hotkeys for video mode selection
I think its on the right windows key, checking... foft
08:35 PM Feature #70: Add hotkeys for video mode selection
foft wrote:
> + Added 1,2,3,4 for profile switch + load
Marvelous!
So many keys, but still wait for the day to a...
sadosp
08:19 PM Feature #70: Add hotkeys for video mode selection
+ Added 1,2,3,4 for profile switch + load foft
08:12 PM Feature #70 (Closed): Add hotkeys for video mode selection
Will release in v24 foft
08:12 PM Feature #70: Add hotkeys for video mode selection
Added something simple...
Press F11 to go to menu.
Then press:
P: PAL
N: NTSC
R: RGB
A: SCANDOUBLE
D: DVI
H...
foft
08:10 PM Feature #70 (Closed): Add hotkeys for video mode selection
Been meaning to add a simple way to switch mode from keyboard. foft
08:14 PM Core v24
Very small change since I've realized how annoying the video mode selection is (i.e. find sd card, copy on settings..... foft

06/07/2018

06:48 AM Bug #64: Pokey pdm timing incorrect
Anyway v23 sounds nice for pdm, reliably. foft
06:47 AM Bug #64: Pokey pdm timing incorrect
The issue was that the write to stimer was now exactly on the enable cycle. I modified the latch delay line to suppor... foft
06:45 AM Bug #69: Some TVs confused by hdmi audio
See video for example
https://photos.app.goo.gl/c3VMPp0XY7nIaJBG3
Not much to go on. Perhaps the clock regen pa...
foft
06:43 AM Bug #69 (New): Some TVs confused by hdmi audio
foft
06:42 AM Bug #6 (Closed): HDMI audio poor quality
foft

06/06/2018

06:28 PM Core v23
A small update, mostly for farb to test HDMI audio
* Add low pass audio filter, massively reduces HDMI audio high ...
foft

06/05/2018

10:07 PM Bug #64: Pokey pdm timing incorrect
Aha, got it... foft
09:58 PM Bug #64: Pokey pdm timing incorrect
Problem with stimer?? foft
09:09 PM Bug #64 (In Progress): Pokey pdm timing incorrect
Reopening, inconsistent timing in calibrate foft
09:07 PM Bug #31 (Closed): HDMI Audio generate high pitch noise (Core 8)
foft
09:07 PM Bug #31: HDMI Audio generate high pitch noise (Core 8)
Added a low pass filter and this is gone, to be released in v23. foft
09:07 PM Bug #6: HDMI audio poor quality
Wired this up and sounding much better.
Unfortunately @farb seems to have completely different symptoms! https://p...
foft

06/04/2018

10:00 PM Bug #6: HDMI audio poor quality
Could look into FIR and IIR filters, but to be honest this seems very lightweight and to work well. Will implement an... foft
09:58 PM Bug #6: HDMI audio poor quality
Trying out various options in Octave.
sample = current method (just take the current value), flat line at top!
me...
foft
09:15 PM Feature #68: Implement stock Atari 800 mode
I agree, not to mention that 4th joystick port's poor fire button. I actually built most of this for the mist a while... foft

06/03/2018

08:35 PM Bug #6: HDMI audio poor quality
Investigating resampling high frequencies to 48KHz with some plots in Octave. The average that I removed wasn't a bad... foft
11:21 AM Feature #68 (Closed): Implement stock Atari 800 mode
It would be great to have the option of using NTSC, OS-B and 48K to reflect an unmodified Atari 800. There are also o... Farb

06/02/2018

10:15 PM Bug #31: HDMI Audio generate high pitch noise (Core 8)
HDMI audio is sounding better now in general (signed/unsigned). This high pitched noise is still heard in some cases ... foft
10:06 PM Core v22
Received my board today.
I tried to understand the flash chip problems. All I found so far is that it has a 64KB s...
foft
08:27 PM Bug #66: Odd flash behaviour on new boards
Flashing a new PDM is very clear that the board is erasing in 64KB blocks. That does not explain the core corruption ... foft
08:01 PM Bug #6: HDMI audio poor quality
The biggest issue with this appears to be that I need to send signed samples. Changed that and its sounding much better. foft
 

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