Project: HDMI/DVI out for STFM

General discussions or ideas about hardware.
User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 10:12 am

Where's the test program ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.


User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 10:47 am

Program doesn't seem to be doing anything ?

IMG_3627.JPG
IMG_3627.JPG (43.95 KiB) Viewed 495 times
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 10:53 am

Tried in medium res..

now just stuck on this...

IMG_3628.JPG
IMG_3628.JPG (96.62 KiB) Viewed 493 times
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
Smonson
Posts: 275
Joined: Sat Oct 28, 2017 10:21 am

Re: Project: HDMI/DVI out for STFM

Post by Smonson » Fri Nov 30, 2018 11:08 am

Doing nothing is good, it means it's only reading zeroes (or 1 in medium). Like me, your machine works with the mod for some unknown reason.

User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 11:15 am

I removed the cap I added and this is what happens to the video...

( still get nothing in that program with the cap removed)




IMG_3630.JPG
IMG_3630.JPG (462.71 KiB) Viewed 482 times

Video is fine with the cap.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 11:33 am

Smonson wrote:
Fri Nov 30, 2018 8:27 am
My observations:
  • The latching behaviour is only level-sensitive, so high-frequency noise around the transitions shouldn't cause glitches
  • The values that are being read seem very non-random, in the sense that either reads the whole word perfectly, or else it reads it with 8-12 wrong bits. It never reads just one wrong bit here and there. The pattern of bits is also very uniform, e.g. 0xb479 comes up a lot (see video and screenshot posted by Icky above)
  • The reason I don't think it's clock related is that both Icky and Troed have the same behaviour, and Troed is using a totally different clock.

Could you get your program to output in binary instead ? Then be easier for people to see if any particular bit(s) are having issues...
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

User avatar
Smonson
Posts: 275
Joined: Sat Oct 28, 2017 10:21 am

Re: Project: HDMI/DVI out for STFM

Post by Smonson » Fri Nov 30, 2018 11:39 am

That's more good evidence that the register read problem isn't related to clock stability :dualthumbup:

The line of Xs is the value in binary.

User avatar
Smonson
Posts: 275
Joined: Sat Oct 28, 2017 10:21 am

Re: Project: HDMI/DVI out for STFM

Post by Smonson » Fri Nov 30, 2018 11:44 am

Icky wrote:
Thu Nov 22, 2018 11:01 am
^ This is what it looks like on Icky's machine while running the test program.

Each line represents a read off the resolution register (the whole 16bit word) that differs from the previous value.

User avatar
exxos
Site Admin
Site Admin
Posts: 7411
Joined: Wed Aug 16, 2017 11:19 pm
Location: UK
Contact:

Re: Project: HDMI/DVI out for STFM

Post by exxos » Fri Nov 30, 2018 11:56 am

Smonson wrote:
Fri Nov 30, 2018 11:44 am
^ This is what it looks like on Icky's machine while running the test program.

Each line represents a read off the resolution register (the whole 16bit word) that differs from the previous value.
So what motherboard revisions are people using then ?

This is mine..
IMG_3631.JPG
IMG_3631.JPG (1.12 MiB) Viewed 614 times

Different boards tend to have different "faults".

Is everyone's HDMI board exactly like the one I have ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

Post Reply