EGA implemented. Only added the color, everything else worked the same as with the CGA-card. Looks fantastic.
Hope BreakPoint can get this running in real time....
Somebody else likes to try the program..?
No comment? 🙁 For me above EGA pictures are outstanding. Remember: Cost 6€ incl. shipment from China, no soldering required for connecting.
It seems indeed not to be easy to remove the jitter from a 640x350 picture..below is unfiltered and resized. Looks quite OK and if you use it only for starting games..so what.
Reagrdless, this was the 1st time I had the opportunity to test one of my HGC Hercules cards. This is from one with aTD3088A. Works in my SS7 board together with VGA without problems. I used a sample frequency of 16 MHz for this as the HGC also runs a dot clock of 16 MHz. Pictures are uncorrected too, only some very minor errors.
Predator99 wrote on 2020-06-29, 21:20:No comment?
everyone is speechless 😁
it's looking very nice yeah.
imi wrote on 2020-06-29, 21:24:Predator99 wrote on 2020-06-29, 21:20:No comment?
everyone is speechless 😁
it's looking very nice yeah.
:-p :-p :-p
This ... is ... AWESOME.
Do you think some treatment could be done to have "Sharp composite artifacting" by just interpreting two nearby pixels as just one larger one in a specific color ? This would help europeans/people with no IBM CGA card to watch CGA in 16 colors without having to invest too much money and even take "screenshots" of it 😀
Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative
Predator99 wrote on 2020-06-29, 21:20:No comment?
Just watching in awe. I don't understand the ins and outs of this, but really enjoying what you're squeezing out of this cheap gadget!
I just bought the same 6€ logic analyzer from china ...
I don't know anything about logic analyzers, but I'll be able to do some tests on my side if you want.
Trying to identify old hardware ? Visit The retro web - Project's thread The Retro Web project - a stason.org/TH99 alternative
Thanks for your feedback 😉
root42 wrote on 2020-06-29, 22:55:Still very impressive. However we need more experiments with different EGA cards! This is still a sampling process and I bet that other cards will have different jitter.
In the mean time I tested 4 EGA cards and they all behave the same...
Deksor wrote on 2020-06-29, 23:29:I just bought the same 6€ logic analyzer from china ...
I don't know anything about logic analyzers, but I'll be able to do some tests on my side if you want.
Great...you may also like to order some of those if you dont have them already. I use them to connect the colored cable to the Monitor connector, fits very good and without loose contact.
https://www.ebay.de/itm/Straight-Right-Angle- … 872.m2749.l2649
mkarcher wrote on 2020-06-25, 15:39:The standard VGA pixel clock for 640x480 (at 60Hz) is already 25MHz, which is above the sample rate of your analyzer.
That seems to be correct. Below screenshot is 640x480x16 "Super-EGA". Only 610 out of 640 pixels are captured. Still looks nice.
well, there's a 100Mhz analyzer available for a little over €20 ^^
imi wrote on 2020-06-30, 09:25:well, there's a 100Mhz analyzer available for a little over €20 ^^
Is it true 100MHz? Some of the cheap ones straight out lie ...
only one way to find out I guess
root42 wrote on 2020-06-30, 09:58:Is it true 100MHz?
Even if it's 100 MHz it does not make sense. It requires extremely powerful cpu to process this amount of data.
Today i received analyzer. On weekend i'll try to find programmers reference to make it work.
BreakPoint wrote on 2020-06-30, 13:42:root42 wrote on 2020-06-30, 09:58:Is it true 100MHz?
Even if it's 100 MHz it does not make sense. It requires extremely powerful cpu to process this amount of data.
why not?
it's probably limited to just 1 or 2 channels at 100Mhz and maybe 50Mhz on 4 channels like the Saleae, 100Mhz is just the maximum sampling rate.
4channels is all we need right...
or is it 6+ for EGA?
I don't think I fully grasp this yet x3
For EGA we actually need 6 channels plus 1 or 2 sync. Except if you only want to support the 200 line modes in RGBI.
EDIT: Which reminds me: does anyone have a circuit that converts RGBrgb to RGB? Then I could try to hook up my EGA to the OSSC and compare with your results.
root42 wrote on 2020-06-30, 14:14:For EGA we actually need 6 channels plus 1 or 2 sync. Except if you only want to support the 200 line modes in RGBI.
EDIT: Which reminds me: does anyone have a circuit that converts RGBrgb to RGB? Then I could try to hook up my EGA to the OSSC and compare with your results.
maxtherabbit wrote on 2020-06-30, 14:35:root42 wrote on 2020-06-30, 14:14:For EGA we actually need 6 channels plus 1 or 2 sync. Except if you only want to support the 200 line modes in RGBI.
EDIT: Which reminds me: does anyone have a circuit that converts RGBrgb to RGB? Then I could try to hook up my EGA to the OSSC and compare with your results.
Ok, seems it indeed supports 6 bit RGB of the EGA. At 39 USD it's not cheap. But It has two DACs plus a bunch of other components...
It's open source so you could always just build one
root42 wrote on 2020-06-30, 14:39:maxtherabbit wrote on 2020-06-30, 14:35:root42 wrote on 2020-06-30, 14:14:For EGA we actually need 6 channels plus 1 or 2 sync. Except if you only want to support the 200 line modes in RGBI.
EDIT: Which reminds me: does anyone have a circuit that converts RGBrgb to RGB? Then I could try to hook up my EGA to the OSSC and compare with your results.
Ok, seems it indeed supports 6 bit RGB of the EGA. At 39 USD it's not cheap. But It has two DACs plus a bunch of other components...
It says "The CGA2RGBv2 adapter will convert the TTL RGBI to analog RGB suitable to be connected directly to a 15KHz capable RGB monitor or to the popular Gonbes GBS-8200 VGA converter".
I'm not sure that modern LCD monitors support 15kHZ.
BreakPoint wrote on 2020-06-30, 14:56:It says "The CGA2RGBv2 adapter will convert the TTL RGBI to analog RGB suitable to be connected directly to a 15KHz capable RGB monitor or to the popular Gonbes GBS-8200 VGA converter".
I'm not sure that modern LCD monitors support 15kHZ.
I have an OSSC and a bunch of 15 kHz CRTs for the Amiga. So I think this is actually a good solution for me.
