STFM to DVI/HDMI project

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ijor
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Re: STFM to DVI/HDMI project

Postby ijor » Fri Jan 12, 2018 12:40 pm

troed wrote:Yeah it does sound strange. However, while the Mega ST schematics are from 1986, you can find the part number also in the Mega STE service manual from 1991:

U17 C025914 IC CUSTOM SHIFTER
U31 or C101608 IC CUSTOM FULL SHIFTER (w/D/A) U31


STF (Non STE) parts on Mega STE service manual ??? Where do you see that?

May be you mean Mega ST, and not Mega STE Service Manual? But then I can't find it online.

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Re: STFM to DVI/HDMI project

Postby ijor » Fri Jan 12, 2018 12:47 pm

Smonson wrote:Haha, Quartus has about three trillion buttons I've never clicked on... :wink:


I see :)

You'll soon learn that the more internal RAM available you have, the more useful SignalTap is. I realize it is not easy to replace the FPGA, but it is recommended to debug with a larger FPGA so that you have lots of internal RAM. Altera provides what they call "Vertical Migration", larger parts with full compatible pinout. That's only for debugging of course, not for production. Yeah, I know, that's not like changing DIP chips on a socket :)

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Re: STFM to DVI/HDMI project

Postby troed » Fri Jan 12, 2018 12:47 pm

ijor wrote:
troed wrote:Yeah it does sound strange. However, while the Mega ST schematics are from 1986, you can find the part number also in the Mega STE service manual from 1991:

U17 C025914 IC CUSTOM SHIFTER
U31 or C101608 IC CUSTOM FULL SHIFTER (w/D/A) U31


STF (Non STE) parts on Mega STE service manual ??? Where do you see that?

May be you mean Mega ST, and not Mega STE Service Manual? But then I can't find it online.


Hahaha, good catch :D I got it from here: https://archive.org/stream/Atari_MegaST ... 1_djvu.txt

What I didn't check was whether the link is in error. It contains several different documents - the Mega STE service manual is just the top one. The above section was from the Mega ST field manual 4.0. You're of course right that an ST Shifter is not in a Mega STE. It's still likely that Atari made up documents for a revision that never came to light.

/Troed

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Re: STFM to DVI/HDMI project

Postby Smonson » Fri Jan 12, 2018 2:33 pm

ijor wrote:I see :)

You'll soon learn that the more internal RAM available you have, the more useful SignalTap is. I realize it is not easy to replace the FPGA, but it is recommended to debug with a larger FPGA so that you have lots of internal RAM. Altera provides what they call "Vertical Migration", larger parts with full compatible pinout. That's only for debugging of course, not for production. Yeah, I know, that's not like changing DIP chips on a socket :)


I'll look into it, I'm only using 24784 bits right now, out of 119808 available in the EP2C5 (20%), so there's a lot of room.

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Re: STFM to DVI/HDMI project

Postby Smonson » Tue Oct 16, 2018 11:53 am

Smonson wrote:Yeah, I can sychronise the line timing to either a long gap between DEs (only for standard modes) or VSYNC.


FYI - I have implemented this today. If vsync is connected, then it will use that, otherwise it will use the first DE of each frame as a replacement for vsync. That should make it easier to install these if a person is only interested in normal video modes and not overscan, which will be poorly centered, particularly horizontally.

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Re: STFM to DVI/HDMI project

Postby rcamp48 » Wed Oct 17, 2018 12:03 pm

What is the status on your board I would be very interested in buying or testing one I have a 1040 STFM would be more than willing to help out in ay way I can I live in Canada.

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Re: STFM to DVI/HDMI project

Postby Smonson » Wed Oct 17, 2018 11:38 pm

A few people are testing prototypes out. I think the next hardware revision will be the first "official" one and I will start making a few of them up for people who want one. Your shifter must be in a socket to be able to install this mod, by the way.

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Re: STFM to DVI/HDMI project

Postby Cyprian » Thu Oct 18, 2018 9:00 am

Would be possible to add one feature - scanline mode?
actually I have no your converter yet, but I have connected ST to LCD TV via VGA cable (my TV accepts ST-LOW via VGA), and that screen resolution is a bit blocky.
Jaugar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
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Re: STFM to DVI/HDMI project

Postby Smonson » Thu Oct 18, 2018 9:38 am

Cyprian wrote:Would be possible to add one feature - scanline mode?


Yep, easy. I've got that planned. Do you think just darkening every second line is the best approach?

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Re: STFM to DVI/HDMI project

Postby Smonson » Thu Oct 18, 2018 9:40 am

Possibly a bit of overbleed from bright pixels into the adjacent ones would also look good? I actually don't own a CRT to study how it really looks.

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Re: STFM to DVI/HDMI project

Postby Cyprian » Thu Oct 18, 2018 9:53 am

Smonson wrote:
Cyprian wrote:Would be possible to add one feature - scanline mode?


Yep, easy. I've got that planned. Do you think just darkening every second line is the best approach?


Smonson wrote:Possibly a bit of overbleed from bright pixels into the adjacent ones would also look good? I actually don't own a CRT to study how it really looks.



worth to check that
Jaugar / TT030 / Mega STe / 800 XL / 1040 STe / Falcon030 / 65 XE / 520 STm / SM124 / SC1435
SDrive / PAK68/3 / CosmosEx / SatanDisk / UltraSatan / USB Floppy Drive Emulator / Eiffel / SIO2PC / Crazy Dots / PAM Net
Hatari / Steem SSE / Aranym / Saint
http://260ste.appspot.com/


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