Neo6502 - hdmi problem, doesn't work

olivierBautista · October 31, 2023, 04:26:02 PM

Hello,
I can't get the Neo6502 to work,

I can put the .uf2 file in the rasberry 2040 with the usb-A cable and my laptop, this is ok.

I connect an hdmi screen, a usb keyboard and a 5v power supply to the usb C.

I connect :
For Oric emulator
pin 10 of UEXT connector (GPIO 25) to pin 24 of 6502 bus connector (IRQ) using external wire.

To use F12 as RESET button (both Apple ][ and Oric)
I connect pin 9 of UEXT connector (GPIO 26) to pin 40 of 6502 bus connector (RESET).

To use F11 as NMI button (Oric)
I connect pin 8 of UEXT connector (GPIO 27) to pin 26 of 6502 bus connector (NMI).

And the Neo3502 makes a little noise when I type on the keyboard, but nothing more.

I've tried several power supplies (5v 3000 ma)

I also tried changing the positions of switch 1.....
I can't find much documentation on Internet.

What else can I do? Do you have any ideas?

thank you in advance for your answers.

Best Regards, Olivier Bautista

LubOlimex · October 31, 2023, 04:39:53 PM

So what exactly doesn't work? Did you try with other uf2 files from our ftp here:

https://ftp.olimex.com/Neo6502/uf2/

Is your monitor with native HDMI? Is a TV or monitor?

olivierBautista · October 31, 2023, 05:25:19 PM

I don't have an image,

I did take my files from this ftp repository.

It's on a tv or on a vga monitor with an hdmi adapter, $:-\$
I'll try with a pure HDMI monitor.

LubOlimex · November 01, 2023, 08:06:01 AM

We've received some reports of some HDMI-VGA adapters causing issues, try with native HDMI an report back.

oldbrokenrecord · January 21, 2024, 09:43:54 AM

Having same problem. :-(

Tried both directly connecting to hdmi tv and using hdmi usb pc adaptor both result in no signal.

I can hear the games that I loaded on NEO6502 running great, but I just can't see a thing.

Just to make sure I tested my hdmi tv and my hdmi usb pc adaptor with a PicoDV and both are working great with it.

I also tried a PiZero2W, Pi3A+, Pi4B, Pi5 and even a C64Mini and they all work great with both.

Perhaps its just a bad solder.

Does someone have some diagnostic software that we could load on the NEO6502 to test it's hdmi circuitry?

olimex · February 28, 2024, 07:34:40 PM

there are few reports that LG TVs do not sync with Neo6502 when used Apple emulators

weirdocollector · April 10, 2024, 07:43:10 PM

Hi!

I've got the very same problem: can't get an image from the HDMI connector of my NEo6502.

I've tried the following:

- use an HDMI2VGA adaptor on a VGA monitor
- connect directly to an HDMI monitor
- flash the apple2_800x600_400MHz.uf2 fw
- flash the firmware_usb.uf2 fw

I all the above cases, I'va also connected a USB keyboard, the Neo6502 emits a beep but no image is displayed.

Any other suggestion ?

Could my Neo be defective ?

LubOlimex · April 11, 2024, 08:22:36 AM

The chances of defective board are zero. We test each board extensively and there is also an empirical with HDMI monitor.

How are the jumpers set?

Did you change video input medium on the monitor via the settings or the remote? Not sure if video resolution can be a problem but maybe try to check that too.

Can it be too long cable? Maybe try with shorter cables.

Some monitors might refuse to work with the Neo, make sure to join the Facebook group for the board and check similar discussions, there are few people mentioning similar compatibility problems, the Facebook group is here:

https://www.facebook.com/groups/745798620676673

Here is filtered results with "HDMI" in search box, I see few results of people reporting problems with some monitors and displays that won't sync with VGA:

https://www.facebook.com/groups/745798620676673/search/?q=hdmi

weirdocollector · June 07, 2024, 08:47:33 PM

Quote from: LubOlimex on April 11, 2024, 08:22:36 AMThe chances of defective board are zero. We test each board extensively and there is also an empirical with HDMI monitor.

How are the jumpers set?

Did you change video input medium on the monitor via the settings or the remote? Not sure if video resolution can be a problem but maybe try to check that too.

Can it be too long cable? Maybe try with shorter cables.

Some monitors might refuse to work with the Neo, make sure to join the Facebook group for the board and check similar discussions, there are few people mentioning similar compatibility problems, the Facebook group is here:

https://www.facebook.com/groups/745798620676673

Here is filtered results with "HDMI" in search box, I see few results of people reporting problems with some monitors and displays that won't sync with VGA:

https://www.facebook.com/groups/745798620676673/search/?q=hdmi

Hi again!

I've finally got the time to check again my Neo6502, and unfortunately no video output is present on HDMI.

Jumpers are set as follow:

1- ON
2, 3, 4 - OFF

I don't use facebook and cannot access to the link lists.

Any other idea ?

Is it actually possible that board is faulty ?

Thanks again.

LubOlimex · June 10, 2024, 08:46:15 AM

Try with a monitor that has physical DVI port too (as complimentary to HDMI). You can try with a TV instead of computer monitor.

We've received feedback that some LG monitors and displays might not work with the board. We've received feedback that older monitors generally work better with the board.

> Is it actually possible that board is faulty ?

The chances of defective board are zero. We test each board extensively and there is also an empirical with HDMI monitor.

weirdocollector · June 10, 2024, 07:28:46 PM

Quote from: LubOlimex on June 10, 2024, 08:46:15 AMTry with a monitor that has physical DVI port too (as complimentary to HDMI). You can try with a TV instead of computer monitor.

We've received feedback that some LG monitors and displays might not work with the board. We've received feedback that older monitors generally work better with the board.

> Is it actually possible that board is faulty ?

The chances of defective board are zero. We test each board extensively and there is also an empirical with HDMI monitor.

Unfortunately I do not have access to a DVI Monitor

I've already used a SAMSUNG TV but with no joy

I'll keep trying with other monitors as I can have access to them.

It's a pity I cannot use my Neo6502 with anything I have on hand.

Thanks for answering.

LubOlimex · June 11, 2024, 08:33:32 AM

You might try one hardware adjustment on the board. You can solder two pads together to enable 5V on the HDMI connector. These 5V might be needed by some monitors and displays, we've provided those pads for such compatibility cases.

Look under the HDMI connector, there are two pads that should be empty that have word "FUSE" nearby. Connect the pads together soldering a small wire between them or 0R resistor (the best idea is to solder diode 1N5819/S4 but it has direction so be careful, cathode should be towards HDMI connector, diode would prevent HDMI monitor powering the board). Testing with a wire is fine if you don't have such diode, but if it works in future you might want to buy such diode and solder there (just make sure about the direction).

You can see where these FUSE pads are located here:

https://ftp.olimex.com/TEMP/Neo-fuse/Fuse-close-Neo6502.jpg

> I don't use facebook and cannot access to the link lists.

Unfortunate, since the facebook group is the most active place for the board. Maybe consider creating some placeholder account with fake info just to access the community.

weirdocollector · June 20, 2024, 10:35:15 AM

Thanks for the suggestion !

I'll try that ASAP.

Thanks again.

Quote from: LubOlimex on June 11, 2024, 08:33:32 AMYou might try one hardware adjustment on the board. You can solder two pads together to enable 5V on the HDMI connector. These 5V might be needed by some monitors and displays, we've provided those pads for such compatibility cases.

Look under the HDMI connector, there are two pads that should be empty that have word "FUSE" nearby. Connect the pads together soldering a small wire between them or 0R resistor (the best idea is to solder diode 1N5819/S4 but it has direction so be careful, cathode should be towards HDMI connector, diode would prevent HDMI monitor powering the board). Testing with a wire is fine if you don't have such diode, but if it works in future you might want to buy such diode and solder there (just make sure about the direction).

You can see where these FUSE pads are located here:

https://ftp.olimex.com/TEMP/Neo-fuse/Fuse-close-Neo6502.jpg

> I don't use facebook and cannot access to the link lists.

Unfortunate, since the facebook group is the most active place for the board. Maybe consider creating some placeholder account with fake info just to access the community.