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by exxos
Sun Oct 29, 2017 11:16 am
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 5912

Re: ST SHIFTER operation ?

Yeah... I wasn't going to name names, but all of that does sound very familiar ;) Welcome to the group of outcasts :lol: By the way, about the conversation early in this thread regarding shift registers: You actually only need four 16-bit shift registers and three 16-bit memories (latches, whatver)...
by exxos
Sat Oct 28, 2017 2:49 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 5912

Re: ST SHIFTER operation ?

Hi guys! Hope I'm not intruding in this thread, I just wanted to say that I'm coincidentally working on an FPGA shifter replacement as well, very similar to what you guys are talking about here (you may have seen my post on Atari Forum). I have implemented monochrome video out to HDMI using a Cyclo...
by exxos
Fri Oct 27, 2017 3:22 pm
Forum: HARDWARE DISCUSSIONS
Topic: MMU clone project
Replies: 3
Views: 298

Re: MMU clone project

It looks almost deceptively simple. In addition to containing a lot of the decoding done by the GLUE in real live, this code seems to interface other components through a "wishbone bus", a bus specification often used to integrate IPs on an FPGA design, AFAIK. Also missing seems to be the actual DR...
by exxos
Fri Oct 27, 2017 2:02 pm
Forum: HARDWARE DISCUSSIONS
Topic: MMU clone project
Replies: 3
Views: 298

Re: MMU clone project

I do believe however, that this also includes the GLUE logic as it mentions is like ROM & ACIA etc. so likely a lot of this code isn't even needed..

Though if those addresses are removed, it does not look like the MMU does much of anything at all..
by exxos
Fri Oct 27, 2017 2:01 pm
Forum: HARDWARE DISCUSSIONS
Topic: MMU clone project
Replies: 3
Views: 298

MMU clone project

As this closely mixes in with issues of bottleneck shifter, I opened up this new threat to discuss the MMU internals.. Thanks to Stephen Leary ( TerribleFire ) , a semi some sample code for how the internal works of the MMU. I presume this is in verilog format, and not really familiar with this, but...
by exxos
Fri Oct 27, 2017 1:41 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 5912

Re: ST SHIFTER operation ?

You might have more luck with a TV, which's video processor could accept a 30p progressive signal and internally double it to 60Hz which the panel natively accepts. I think this is getting back onto some other talks at some point earlier. Will basely need to store a entire frame in ram as a buffer,...
by exxos
Fri Oct 27, 2017 1:15 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 5912

Re: ST SHIFTER operation ?

Yes, 25hz is most likely out of range for most panels. 30hz should be possible by most. Personally I’m willing to work with 30hz for better gains elsewhere. Sounds like we could be into iffy territory then :( It could possibly be better to go with overscan and gain something on the vertical resolut...
by exxos
Fri Oct 27, 2017 1:14 pm
Forum: DISPLAYS & CONVERTERS
Topic: NEC MultiSync EA190M
Replies: 2
Views: 997

Re: NEC MultiSync EA190M

I downloaded the manual just in case it vanishes at some point..
by exxos
Fri Oct 27, 2017 12:20 pm
Forum: HARDWARE DISCUSSIONS
Topic: ST SHIFTER operation ?
Replies: 94
Views: 5912

Re: ST SHIFTER operation ?

25Hz refresh rate is out of specs for almost all TFT panels. Native refresh rate is almost always 60Hz, that's why a 50Hz scrolling screen appears a little jerky. I guess it depends if the data is buffered or not, no idea. As if the screen data was buffered, the screen would still refresh at 50hz, ...