64kib

07/15/2017

FO 09:47 PM EclaireXL Bug #25: F10 Hard Reset Ignore inserted cartridge (Core v7)

This is the last thing remaining for V15. In order to do it (simply) I decided to allow off PBI access from turbo mode and zpu. That seems to work now, except its failing timing. I think I need to plumb the internal freezer in differentl... foft

FO 09:44 PM EclaireXL Bug #25 (In Progress): F10 Hard Reset Ignore inserted cartridge (Core v7)

foft

07/09/2017

FO 01:25 PM EclaireXL Feature #24: A board with Atari SOUL!!!! (ROM in block ram support)

I'm using block ram in the FPGA for the OS ROM and BASIC. It can be read in 2 cycles and written to in 1 cycle. SDRAM takes about 5-6 iirc. So in turbo mode, with no cpu cache, this makes a huge difference in speed. foft

07/07/2017

FO 09:26 PM EclaireXL Feature #24: A board with Atari SOUL!!!! (ROM in block ram support)

Also of course nice and fast vs uncached sdram...
sysinfo fp test from 6x->20x :-) I probably need a cache to get this closer to 30-40x, but that will take some work. foft

FO 09:13 PM EclaireXL Feature #2: PBI support

Added antic refresh cycles foft

07/06/2017

FO 09:28 PM EclaireXL Feature #51: Debug port

I have a first cut of this building. This will be part of the v15 core.
Next I need to build the capture software to stream this into the PC. Then some post-analysis software, probably a hacked up emulator. foft

07/05/2017

FO 09:41 PM EclaireXL Bug #49 (Closed): CORE13 - NTSC/PAL switching

foft

FO 09:40 PM EclaireXL Bug #49: CORE13 - NTSC/PAL switching

Fixed, will be in v15 when I release it. foft

07/04/2017

FO 09:31 PM EclaireXL Bug #49: CORE13 - NTSC/PAL switching

Trying to fix this one, but its nasty. I need more brain cycles to fix it... foft

FO 09:29 PM EclaireXL Feature #14: Svideo core for first prototype

Hmm, just reading that IRE is _relative_ so that might be why increasing voltage didn't make anything brighter!!
https://en.wikipedia.org/wiki/IRE_(unit)
So I wonder if I could have a 0V-0.5V signal that uses the correct relative s... foft

07/02/2017

FO 10:50 PM EclaireXL Feature #14: Svideo core for first prototype

For anyone with composite/svideo setup. Please can you tell me what you think of svideo_gtia6.sof vs the previous version.
This is generated more the 'atari way' - i.e. off hue/brightness with phase shifts, rather than being based on ... foft

FO 11:42 AM EclaireXL Feature #14: Svideo core for first prototype

I mean svideo and composite, it's the same thing pretty much.
I've got the gtia style one running pretty well for ntsc now. Its interesting to implement if nothing else:) foft

FO 01:10 PM EclaireXL Bug #54: GTIA issue when Turbo > 4X

Yeah, this kind of test program is very helpful. Thanks. foft

07/01/2017

FO 05:05 PM EclaireXL Feature #14: Svideo core for first prototype

That works, kind of! Basic screen and star wars shields look the correct colours, but I have no red. Also very grainy and svideo is a single colour?! foft

FO 12:59 PM EclaireXL Feature #14: Svideo core for first prototype

Writing an 'atari-style' implementation instead of going via RGB. Fixed saturation, simple phase shift for colour. foft

FO 07:10 AM EclaireXL Feature #14: Svideo core for first prototype

Interesting...
http://atariage.com/forums/topic/29621-atari-video-circuits-experiment/
So fixed saturation (except gray), just phase shifted for the cols. Then add luma. Might try that rather than generic rgb component. foft

FO 03:59 PM EclaireXL Feature #53 (Closed): Add version number to settings

Add version number to settings foft

06/30/2017

FO 10:15 PM EclaireXL Bug #52: Atari Control Picture

I checked an older core in case I introduced it with the antic timing changes for pbi. Was bad then, so unrelated.
This is a nice static picture to debug in sim or signaltap. I like this kind of test case:-) foft

FO 10:10 PM EclaireXL Feature #14: Svideo core for first prototype

Added a poke 712,15 for comparison of max values. Interesting how the amplitude for basic 'blue' is so much higher yet the peak amplitude is comparable...
Atari:
!composite_atari_max.png!
Eclaire:
!composite_eclaire_max.png! foft

FO 09:54 PM EclaireXL Feature #14: Svideo core for first prototype

I mean see how the 'white' on ready already takes most of the range, without trying to increase it. foft

FO 09:54 PM EclaireXL Feature #14: Svideo core for first prototype

Atari
!composite_atari_basic.png!
Eclaire
!composite_eclaire_basic.png!
We have a range of 0-1v on the DAC. 0-0.3V sync and 0.3V-1.0V is set by changing the dac level. So trouble is its not really enough. Might still need to chan... foft

FO 09:50 PM EclaireXL Feature #14: Svideo core for first prototype

Added traces of Atari basic from the scope, to see the voltage level differences.
Eclaire is driving my monitor, Atari is through a 66ohm resistor (little low, so voltage is suppressed a little).
Still, a stark difference! foft

06/29/2017

FO 08:59 PM EclaireXL Bug #49: CORE13 - NTSC/PAL switching

I think I've identified the problem. If the zpu happens to exit the menu at the end of an 'original' cycle the pbi logic can block the response from a memory access. Now to think about how to implement this in a better way... foft

06/23/2017

FO 07:27 AM EclaireXL Feature #11: Non-uk keyboard support (custom keyboard mapping)

It's written in c. The Atari core is built with a DMA port and the ability to freeze the 6502. Outside that there is another CPU (the zpu) that draws the menu, handles USB, se card, drive emulation etc. It has quite a lot of custom hardw... foft

06/22/2017

FO 09:12 PM EclaireXL Feature #11: Non-uk keyboard support (custom keyboard mapping)

Yeah, that should work. You just described a multiplexor btw.
Got guests this weekend, so will do the plumbing next week. foft

06/21/2017

FO 09:02 PM EclaireXL Bug #33: Wizard of Wor

I'm going to build a debug tool to make it easier to track these things down.
For now, a workaround. Use 2x turbo mode! It hasn't crashed yet... foft

FO 08:56 PM EclaireXL Feature #11: Non-uk keyboard support (custom keyboard mapping)

I put up a build with your mapping as ansikbd.sof in the usual place. Let me know if it works as expected please. foft

FO 09:44 AM EclaireXL Feature #11: Non-uk keyboard support (custom keyboard mapping)

Thanks
11 is left alt
extended 11 is right alt - I use 1xx for extended xx.
I'll build a test core with your changes, then we can add a switch later. I wonder if I can identify ansi/iso automatically. foft

06/20/2017

FO 07:41 PM EclaireXL Feature #11: Non-uk keyboard support (custom keyboard mapping)

What is an a8k file? Is there already a keyboard mapping file format we can use? foft

FO 07:36 PM EclaireXL Feature #14: Svideo core for first prototype

Worth a read for some background: http://codeandlife.com/2012/10/09/composite-video-decoding-theory-and-practice/#more-1032
After this its 'Video Demystified' for the details foft

FO 07:12 PM EclaireXL Feature #51 (New): Debug port

I'm finding it hard to track down issues in some games/programs. Output debug information so I can look into the problem after the fact.
I'm thinking as a starting point something like this:
8-bit output at 4x clock:
AH,AL,D,FLAG
... foft

FO 07:08 PM EclaireXL Feature #2: PBI support

Hias tried out PBI on the v1.
Surprise: Turbo freezer didn't work! Mine works perfectly on v2...
He investigated and found three things:
i) REF_N pullup is a little low, so with any increased capacitance it takes too long to ris... foft