[Saldali]

…and as all hope was about to be abandoned, the OSSC found its way to my door, after 2 months in transit.

[Saldali]

Thank you BuckoA51. Just sent an email.

[Saldali]

I was able to solve my problem using a JTAG programmer and some very appreciated help from marqs and others in the forum.
See the whole story here.
Best regards and thanks to all.

[Saldali]

Thank you marqs and all who helped, you were first class.
I now have a working OSSC clone again.

My new unit from VGP is on its way. The old one that’s back to working state – although stuck on fw 0.86 – I’ll try to find a buyer for it.

I’ll be posting on the 0.88 thread, to let the other guy with same issue know about my case development.

Thank you for a great product.
Best regards to all

A.Salvador

[Saldali]

My thanks to marqs for the new file.
I tried it, but ended up with the same error. 🙁
megari, I took a look at the link you gave me. I understand you suggest, that I could somehow hack the code for my chip? I completely lack the skills for that 🙁

I don’t expect marqs to support devices made with different specs from his own, but I’d be very happy – and some other people too – to at least get my device back to working condition, even with some backward firmware version that will never be upgraded again.
…if such thing is possible.

If I can’t go anywhere with the JTAG programmer and help from the forum, will try to invoke warranty from micomputer.es, but I suspect they’ll argue that this was my fault, for “messing up” with firmware upgrades.

[Saldali]

I tried to downgrade my OSSC using JTAG, but ran into an error message.
Described in this thread

marqs, if you could take a look into this error, I’d appreciate.

[Saldali]

So, my €13 Altera USB Blaster JTAG programmer arrived.

This was my attempt at fixing my OSSC by downgrading via JTAG, since the SD card reader went bad after the upgrade to 0.88
I now know that my OSSC uses different parts from the one sold by VGP, which seems to account for the “accident”.

I had previously updated from the original version (don’t know) to 0.86, and that went fine, using the SD card method.
Since I couldn’t find 0.86 as a .jic file to get back to it, I followed the JTAG programming guide to try and download this file:
ossc_0.85-aud.jic (EDIT: and also ossc_0.76-aud.jic)
But then I got this error message:

Info (209060): Started Programmer operation at Thu Dec 17 17:39:54 2020
Info (209016): Configuring device index 1
Info (209017): Device 1 contains JTAG ID code 0x020F20DD
Info (209007): Configuration succeeded — 1 device(s) configured
Error (209025): Can’t recognize silicon ID for device 1. A device’s silicon ID is different from its JTAG ID. Verify that all cables are securely connected, select a different device, or check the power on the target system. Make sure the device pins are connected and configured correctly.
Error (209012): Operation failed
Info (209061): Ended Programmer operation at Thu Dec 17 17:40:00 2020

So, if anyone has an idea what’s going on, I’d very much appreciate some help. I’ve never used this tool before.

EDIT: the OSSC was powered up when I tried this.

[Saldali]

I got my OSSC from micomputer.es.

The wiki at junkerhq.net lists them as source of pre assembled boards, along with others. I chose them for geographic proximity and for being in the EU.
I thought I was getting the real deal.

Anyway I’ve bitten the bullet and ordered a new one from you. I hope I can fix mine with a JTAG programmer and then try to sell it, to try minimize the damage.
This is because I don’t want to be left out of the firmware improvement train.

[Saldali]

8 legged chip and bottom label

[Saldali]

accidentally double posted…

[Saldali]

marqs, hope the quality is good enough:
Bottom side

[Saldali]

Thank’s for your reply marqs. I realize you are the developer of the OSSC?
It’s such a great product, it’s the only way I found to get acceptable video quality out of my euro TI99. I’m hooked.

I upgraded from 0.86 to 0.88

The printed manual that came with the unit mentions Revision 1B

I bought it March or April this year, from this seller:
https://www.micomputer.es/es/inicio/396-ossc-open-source-scan-converter.html
It came with a remote, multi region PSU and a quality printed manual, which referred to VideogamePerfection.com/ACEL in the last page

I’m thinking… if I downgrade using the JTAG socket, maybe I can get back to normal operation again?
I’ve ordered a USB-Blaster compatible programmer to try that. I saw that you have the 0.85 .jic file in the firmware folder. Then, use the SD to go back to 0.86?…

BR
A.Salvador

[Saldali]

hoshikawa, I had exactly the same problem. Have you found a solution?

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