[JohnFante]

Reprogramming the remote did the trick 🙂 Thank you very much!  @ALL!

[JohnFante]

Ok. So I have to reprogram the remote when I go from 0.90 to 1.10?

[JohnFante]

I did the mod on my 1.7 board but something is wrong.

After I did the mod I updated the firmware to 1.10 (standard way via SD card and remote) and restarted.

It now says it is on 1.10 both on the LCD and shortly on screen when I start up and I have the normal checkered startup picture but now the remote does not work!! When I pres the buttons the green led flashes but that is that. No reaction.

When I added a scart source it did not shift to it automaticly as it normally does.

I can not downgrade the firmware since the remote does not work.

Here is a picture of the soldering. Not the neatest:

https://www.dropbox.com/scl/fi/wwh0i4fggux6a9quplx75/OSSC-mod.jpeg?rlkey=dp7tmqs02s4mbdvghx78o1u4k&dl=0

Any suggestions? I am not sure if I messed up some pads along the way ….

• This reply was modified 1 year ago by JohnFante.

[JohnFante]

Trying to do the mod on my version 1.7 device but the heatsink is covering the legs of the chip completely on all sides: https://www.dropbox.com/scl/fi/wvynvo8n22v2421h0shys/Heatsink.jpeg?rlkey=sogk3059035sl78vn5cmoll4e&dl=0

Any recommendation on how to remove it? Saw a guy on YouTube using dentalfloss. Seems quite straight forward: https://www.youtube.com/watch?v=W7oL3sfztUU

Or is there another way to do the mod?

The device is by made by Micomputer – if anybody knows them: https://www.dropbox.com/scl/fi/qidhyxiekh8m76vwtxr6d/Micomputer.jpeg?rlkey=lzuws5vwu6k6ca9a5565v5r1u&dl=0

Thank you!

• This reply was modified 1 year ago by JohnFante.

[JohnFante]

The Enterprise outputs 312-p.

So far the settings seems to have helped with the problem.

[JohnFante]

I think I found the solution 🙂

I turned “Allow upsample2x” ON (default is off) in Sampling opt. and that has almost completely removed the jittering.

[JohnFante]

I am using this RGB to scart cable.

There is a bit of info on the output of the EP here. It is in Hungarian but translates easily in Chrome.

Thank you … and not least … Live Long and Prosper 🙂

[JohnFante]

OSSC of course supports interlace, it could be your display struggling with the off spec mode though?

I thought the OSSC outputtet a standard format or does that vary depending on the input?

Sorry if this is a noob question 🙂

EDIT: Found the list. Will start testing my different displays 🙂

[JohnFante]

I am waiting for a new RGB-cable with a 220 ohm resistors instead of the 100 ohm to see if that solves my sync problem.

In the meantime I am looking for advice on getting the OSSC to show a interlaced picture correctly.

The image is this loading screen. When I run the program the picture turns on and off like this.

I have talked to the author of the program and he writes this about the picture:

“It is an interlace LPT:

40 lines upper border
6×9 lines are 6 4color character lines (Bricky text)
100 lines are attribute mode
6×9 lines are 6 4color character lines (Prise text)
28 lines between Prise text and Enterprise text
8 lines Enterprise text
2 lines color lines
sync: 14+3+4+1+4
40+54+100+54+28+8+2+26=312
Sync (there is no reload bit in this sync
F2 92 3F 00 00 00 00 00 00 00 00 00 00 00 00 00
FD 00 3F 00 00 00 00 00 00 00 00 00 00 00 00 00
FC 00 20 3F 00 00 00 00 00 00 00 00 00 00 00 00
FF 00 3F 38 00 00 00 00 00 00 00 00 00 00 00 00
FC 12 06 3F 00 00 00 00 00 00 00 00 00 00 00 00
LPT continuing
40 lines upper border
6×9 lines are 6 4color character lines (Bricky text)
100 lines are attribute mode
6×9 lines are 6 4color character lines (Prise text)
28 lines between Prise text and Enterprise text
8 lines Enterprise text
2 lines color lines
sync: 14+3+4+1+4
40+54+100+54+28+8+2+26=312
Sync: (here reload bit sets, so this is the end of LPT)
F2 92 3F 00 00 00 00 00 00 00 00 00 00 00 00 00
FD 00 3F 00 00 00 00 00 00 00 00 00 00 00 00 00
FC 00 06 3F 00 00 00 00 00 00 00 00 00 00 00 00
FF 00 3F 20 00 00 00 00 00 00 00 00 00 00 00 00
FC 13 06 3F 00 00 00 00 00 00 00 00 00 00 00 00”

Is the OSSC not capable of showing interlaced pictures?

[JohnFante]

You should be seeing a very bright image with your current cable.

I do not when I use the OSSC. If I take the scart directly to my TV/monitor (an old Samsung that has both scart and DVI and VGA) then the picture is rather bright.

Therefore, the resistors could very well be to small. There are reports of people using 220R resistors with good result. I will give that a go and see if that changes things :-).

[JohnFante]

Standard sync settings to try are setting H-PLL Pre-Coast and Post-Coast to 3 and tweaking Analog sync Vth. Keep Analog sync LPF at default 2.5Mhz.

Ok 🙂 I will start testing …

Can you post some pictures of the resistors in the cable? The drawing you posted of the SCART pinout has only 100 Ohm resistors which are not enough

The scart end is glued together but I wrote the company that produces the cable and they got back very quickly:

“The resistors value are 100ohm(in RGB signals and Sync) and 470 ohm between pin 8 and 16 for RGB activation singnal.”

[JohnFante]

does your cable have the correct attenuation on the sync line

I should have. I am using this cable from Retrocables. I have opened the scart end a bit and there are resistors in there. It is used by a “lot” of people in the Enterprise community … lot in quotation marks, we are not that many 🙂

It is extremely strange to have analogue sync lpf off entirely with 15khz sources.

I have not done a lot of testing of the different OSSC settings so it can be that it is the wrong thing I have turned off. I turned Analog sync LPF off because it said on the wiki that “Required if there is noise or glitches on the sync line.” and I was having issues with some games loosing picture. The screen just turned black once in a while. Turning this off made it better but it can be the wrong solution to my problem.

[JohnFante]

I think it is csync but I am not sure. The video RGB out from the machine looks like this:

Video out – Enterprise 128

The scart end needs some small resistors. This is the normal pinout:

Scart resistors

My cable should have all the necessary resistors etc.

[JohnFante]

Thank you for the reply! I have so far had best result with “Analog sync LPF = off”. If it is “on” the picture – in some cases – have a tendency to turn on an off. It is like the OSSC can not fix the sync.

This particular demo is not a huge thing for me but I would like to have the most stabile overall setup. Are there some settings that are common to adjust for 8 bit machines in the Spectrum, Amstrad, MSX “area”? I know that no machines are the same but maybe there “common” issues?

No matter what thank you for your help 🙂

[Author]

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