Print

[ried]

Toggle the 75 ohm termination setting?

[bmwcyclist]

Thank you I think we made some progress but still not quite there:

https://youtu.be/2wp9vRLRlvY?si=mHcU8lnSAgFyn2Sr

[ried]

I wonder if you're using the Lisa profile that came with your RGBTOHDMI? If so, it may be quite different than the one cited earlier this thread (thank you, stepleton and sigma7).

Pull the microSD card out of your RGBTOHDMI, look in its folder structure to find the Lisa profile's .txt file. Make a backup copy and save it to your computer, then edit the text file on the microSD card. Paste in the following:

sampling=7,7,7,7,7,7,7,0,1,0,10,0,0,0,0,4,1,1,1,0,79,256,256,256,256,39,256,256
geometry=164,7,552,364,720,364,3,4,1,1,20374338,896,5000,379,4,0,0
palette=Mono_(2_level)
scanline_level=0

Save and close it, then put the microSD card back into your RGBTOHDMI and try again. That modified Lisa profile may work better 

Edit: I see you've already tried using the forum profile. Shoot.

[stepleton]

The only way I got a working RGBtoHDMI profile was through a couple hours of trial and error, and even then, it only works with my Lisa 1 and not my 2/10. More hours necessary for me to find a solution that works with both, I think, and then who knows whether it would work with a third Lisa?

[bmwcyclist]

My LISA is a 2/10.

Are there any other products that might work?

[ried]

stepleton's Lisa profile works on all of my Lisas, including a 2/10 (without the screen mod). This is the RGBTOHDMI that I use: https://www.ebay.com/itm/186793326425

[AlexTheCat123]

If you're not already doing it this way, maybe try connecting straight to your Lisa's VSYNC, HSYNC, and VID signals instead of hooking the RGBtoHDMI to the Lisa's composite output. That's how I do it and it's incredibly reliable, not to mention sharp.

[bmwcyclist]

If you're not already doing it this way, maybe try connecting straight to your Lisa's VSYNC, HSYNC, and VID signals instead of hooking the RGBtoHDMI to the Lisa's composite output. That's how I do it and it's incredibly reliable, not to mention sharp.

I need to be able to use this for public presentations where the Lisa demonstrated.

Connecting to the signals requires running cables to the video card yes?

[bmwcyclist]

I’ve made it to her. I have a stable screen, but there are two copies of it!

Don’t know much about video signals so I’m a bit lost. I’ve played with the Settings, but so far no luck.

[sigma7]

If you're not already doing it this way, maybe try connecting straight to your Lisa's VSYNC, HSYNC, and VID signals instead of hooking the RGBtoHDMI to the Lisa's composite output. That's how I do it and it's incredibly reliable, not to mention sharp.

Connecting to the signals requires running cables to the video card yes?

No, these signals are also available via connections to the motherboard or CPU board (which is safer than digging around in the CRT area).

[bmwcyclist]

Alex, could you post pictures of your set up?

Sigma7, do you have some drawings, photos or schematic to point out where I would get the signal from?

[sigma7]

Sigma7, do you have some drawings, photos or schematic to point out where I would get the signal from?

The Motherboard schematic shows the signals at the card edge connectors for the CPU board and the chassis.

Between those is a buffer chip (the only 74 part on the motherboard), which buffers the video dotstream, hsync and vsync.

I haven't connected to the signals myself, so I can't say if it makes a difference to get them from before or after the buffer... hopefully Alex knows.

[AlexTheCat123]

I can provide some pictures if you want me to, but I don't think they're going to be very useful to you. I'm not connecting directly to the motherboard; I'm instead hooking to a header on my Lisa breakout board that lets me run the card cage outside the Lisa. So looking at my ribbon cable between the breakout and RGBtoHDMI probably isn't super helpful since you won't be doing it the same way.


I'm connected after the buffer, so that's probably what I would do to if I were you, just to be safe. You just need to pull VID, HSYNC, and VSYNC off that chip, and run them to the RGBtoHDMI. HSYNC and VSYNC connect to HS and VS on the RGBtoHDMI as you would expect, and I believe VID connects to grn2, although I can't validate this last one right now because my RGBtoHDMI is hooked to a Lisa that's in the middle of compiling some LOS code right now! I know it hooks to one of the grn pins though.


And oh yeah, don't forget ground as well!

[Lisa2]

...do you have some drawings, photos or schematic to point out where I would get the signal from?

For the digital RBGtoHDMI interface cable, I brought out the TTL signals from the Lisa MB.  U1 ( LS123)  pin 6   (VID) to IBM CGA pin 4 ( Green ), U1 pin 3   (Vsync) to IBM CGA pin 9 ( Vsync ), U1 pin 8   (Hsync) to IBM CGA pin 8 ( Hsync) and ground.  Works perfect!

Rick

[bmwcyclist]

Fantastic thank you!

Looks like I have a digikey order in my future,

...do you have some drawings, photos or schematic to point out where I would get the signal from?

For the digital RBGtoHDMI interface cable, I brought out the TTL signals from the Lisa MB.  U1 ( LS123)  pin 6   (VID) to IBM CGA pin 4 ( Green ), U1 pin 3   (Vsync) to IBM CGA pin 9 ( Vsync ), U1 pin 8   (Hsync) to IBM CGA pin 8 ( Hsync) and ground.  Works perfect!

Rick