LisaList2

The Lisa profile that comes with RGBtoHDMI was made by the creator using lisa specs not with an actual lisa.

It doesn't work with my Lisa as well as many people's including when Adrian tried it on his show.

He got a new better profile and said it would be included and updates to the video adapter, but I haven't seen any updates posted.

The correct settings are available in this thread: https://lisalist2.com/index.php/topic,454.0.html

Sadly, I tried those quite a while back and they did not work either.

Interesting. Those settings should be universal for all Lisas that don't have the screen mod installed. Can you describe the hardware you're using and how it's failing?

Quote from: ried on January 19, 2026, 10:48:37 PMInteresting. Those settings should be universal for all Lisas that don't have the screen mod installed. Can you describe the hardware you're using and how it's failing?

Lisa 2/10 no screen modifications H rom.

The only way I was ever able to get it to work was to use a connection directly to the chip. A few weeks later, the chip went bad on me so I abandoned using that method. I couldn't get a nice clean way to get the video out of the back anyway.

I've seen several others state that they couldn't get their 2/10 to work with the RGB to HDMI either.

My hope is that the profile used on Adrians digital basement might work for me.

Posts 12-17/18
https://lisalist2.com/index.php/topic,454.0.html

Quote from: bmwcyclist on January 20, 2026, 07:44:57 AMMy hope is that the profile used on Adrians digital basement might work for me.

If you want, I can text Adrian and see if he can send me the profile!

We might want to coordinate around this to work things out systematically.

The profile I posted at the start of the thread that ried linked works on my Lisa 1 but not my 2/10. I haven't investigated why, but I doubt that there is much difference between the way either computer makes video; it could be that the RGB2HDMI is quite sensitive to certain kinds of noise when processing signals specifically like the kind the Lisa makes (whatever that means).

We can discard the old Lisa profile that was made without access to a Lisa, but perhaps sharing multiple profiles in the same spot and seeing how they are similar or different would be enlightening.

Note that if the RGB2HDMI really is "noise fragile" for Lisa video signals, then variations in the RGB2HDMI itself could be a factor; in other words, a profile that works on my device may not work on yours.

Quote... works on my Lisa 1 but not my 2/10. I haven't investigated why, but I doubt that there is much difference between the way either computer makes video

AFAIK, the composite video driver circuit is a bit different on the two motherboards.

The 2/10 design uses a conformal coated circuit (essentially SMT on a ceramic substrate), while the Lisa 1 design uses discrete components.

The 2/10 design has a bias to -5V that the earlier design does not, as well as numerous component value changes.

Something like the drawing below, although someone (else) should check for accuracy.

Quote from: AlexTheCat123 on January 20, 2026, 11:56:10 AM

Quote from: bmwcyclist on January 20, 2026, 07:44:57 AMMy hope is that the profile used on Adrians digital basement might work for me.

If you want, I can text Adrian and see if he can send me the profile!

wow! yes!

How do we add Karma and thank people now, I don't see a button...

Quote from: bmwcyclist on January 20, 2026, 04:51:08 PMHow do we add Karma and thank people now, I don't see a button...

The 'karma' functionality of the forum disappeared in the update from 2.0.x to 2.1.x. We were able to restore karma values (as they were prior to the update) but modifying +/- karma is simply no longer a thing.

> AFAIK, the composite video driver circuit is a bit different on the two motherboards.

You would hope that by now I would have learned not to make hasty assumptions!

It grows late here in London Town, but both of these simple circuits might be fun to emulate in everyone's favourite in-browser circuit simulator. It might illustrate the difference between the signals. VID is the pixels and should be TTL, and I think CVOUT should be TTL too... gathering evidence from here and here it looks like it is known on the CPU board as \CSYNC and is made here.

So I think that's about all we need to know with the possible exception of the parameters that the circuit simulator would need to more accurately reproduce the transistors' behaviour. To approximate VID and CVOUT in the circuit simulator, I would make CVOUT a 380 Hz 0V/+5V square wave with a 90% duty cycle and VID the product of ANDing CVOUT with a 280 KHz square wave.

When using the composite output of the Lisa to drive the RGBtoHDMI the only change needed is to turn the 75R Termination On for the Lisa2/5 and Off for the Lisa2/10.  For me all the rest of the settings stay the same.
Rick

Thanks!

FYI, I can't test again right now but as documented in a previous thread that did not work for my 2/10

I've decided to give this another look. I can confirm that I need to turn 75R termination ON for the Lisa 1 and OFF for the 2/10.

Additionally, I've found that for my profile, the Lisa 1 requires a sampling phase setting between 0 (0 degrees) and 4 (180 degrees), while the 2/10 requires a sampling phase between 3 (135 degrees) and 7 (315 degrees). I've selected 4 then, an arbitrary choice from the two that overlap.

My profile, which I keep on the SD card at Saved_Profiles/6-12_BIT_YUV_Analog/Apple_/Apple_Lisa_.txt, is as follows:

sampling=4,4,4,4,4,4,4,0,1,0,5,0,0,0,1,4,0,1,1,0,64,256,256,256,39,256,256,256
geometry=156,9,720,360,720,368,2,3,1,1,20374338,896,5000,384,4,0,0
palette=Mono_(2_level)
scanline_level=0
Meanwhile, in the thread ried linked, we have

This setting for 8-bit analog YUV by user RolandJuno:
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=164,7,552,364,720,364,2,3,1,1,20374338,896,5000,379,4,0,0
palette=Mono_(2_level)
scanline_level=0
sigma7 recommends substituting 3,4 for 2,3 in the geometry= line, preferring a pixel ratio of 4/3 to 3/2 (height/width).

As it is here in this adaptation of the RolandJuno setting by ried:
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
Beyond the thread:

This variant is by DosFox, who made the first operational Lisa clone:
sampling=7,7,7,7,7,7,7,0,1,0,10,0,0,0,1,4,1,1,1,0,49,256,256,256,256,31,256,256
geometry=160,10,712,362,720,368,2,3,1,1,20368338,896,5000,377,4,0,0
palette=Mono_(2_level)
teletext_scaling=0
scanline_level=0
I wonder what the Adrian's Digital Basement variety is like?