EPROMs for Universe BIOS...

[Josh128]

So the AMD 27C1024 or equivalent is the defacto standard used for Neo Geo modded BIOS's. I have used these with success, but the 2048 version EPROMS are half the price. Anyone ever had any luck using a 2048 for a UniBIOS? I understand there may be a need to use a hex editor to expand the BIOS code to 2048 kb, but theoretically it should work fine, no?

[NoAffinity]

You should only need to double the code. First line starts where last line ends.

I recently used a 4096, quadrupling the code this way.

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[Josh128]

Thanks, just needed some confirmation!!

[BuffaloWing]

Anyone here successfully use GQ-4X with ADP-054 adapter to program ST 27C1024 EPROM? I tried a bunch of them and they all gives error messages. I doubt trying AMD will me a different result. I've try Google and it seems people have problem in the past and there isn't any solution other than purchase another programmer.

[Bratwurst]

Anyone here successfully use GQ-4X with ADP-054 adapter to program ST 27C1024 EPROM? I tried a bunch of them and they all gives error messages. I doubt trying AMD will me a different result. I've try Google and it seems people have problem in the past and there isn't any solution other than purchase another programmer.

I have this exact setup and have been able to program some ST branded 27C1024, but a few were really problematic. They'll erase, verify as blank but never write properly.

[BuffaloWing]

I have 5 ST 27C1024, none of the will write successfully. I know that's a small sample size, but I don't think all of them will be duds. I've changes all the parameter on device.txt and none will make any difference. The adapter works with 27C400.

[NoAffinity]

Have you tried powering with an external power supply? Also, may need to change the v3/v4 jumper.

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[BuffaloWing]

Have you tried powering with an external power supply? Also, may need to change the v3/v4 jumper.

Sent from my SM-G955U using Tapatalk

Yes, I did them. No difference at all.

I guess I have to get a TL866II PLUS. That programmer works right? Need an adapter for this one too?

[NoAffinity]

Tl866's work great. I have the gq and the tl. Gq is very finicky. TL just works. Also programs GAL's which is nice. No adapter needed for 40 pin.

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[Josh128]

Im using the TL866 as well, seems like a solid little unit.

[BuffaloWing]

Thanks guys. I'll get a TL866.

[Arthrimus]

If I recall correctly there is a software bug with the GQ4x and 27C1024 EPROMs. Try burning them as 27C1001 and see if that works. I believe those 2 EPROMs are interchangeable.

[Shelcoof]

Have you tried powering with an external power supply? Also, may need to change the v3/v4 jumper.

Sent from my SM-G955U using Tapatalk

Yes, I did them. No difference at all.

I guess I have to get a TL866II PLUS. That programmer works right? Need an adapter for this one too?

I made a little video to give an idea of how to use this programmer

https://youtu.be/Y3k2pE0ZQzs

Hope it helps you out

There are details in the description if you need further details

[BuffaloWing]

If I recall correctly there is a software bug with the GQ4x and 27C1024 EPROMs. Try burning them as 27C1001 and see if that works. I believe those 2 EPROMs are interchangeable.

I looked up 27C1001 spec sheet, it appears to be 32-pins as oppose to 27C1024's 40-pins. Therefore the pins will not line up.

I wonder if GQ-4X only works with OTP version? How could a popular programmer like this can have this issue and continue to sell the ADP-054 for this purpose so long?

Have you tried powering with an external power supply? Also, may need to change the v3/v4 jumper.

Sent from my SM-G955U using Tapatalk

Yes, I did them. No difference at all.

I guess I have to get a TL866II PLUS. That programmer works right? Need an adapter for this one too?

I made a little video to give an idea of how to use this programmer

https://youtu.be/Y3k2pE0ZQzs

Hope it helps you out

There are details in the description if you need further details

Thanks, that should be handy when I get TL866.

[Arthrimus]

My bad, I see the 27c1001 is an 8 bit part. I was thinking of another issue with the GQ-4X and 27C4096 EPROMs. With that EPROM the write always fails, but if you select the 27C4002 instead it will program correctly.

Why don't you try programming it as a 27C210? That is actually a pin compatible equivalent to the 27C1024.

[BuffaloWing]

My bad, I see the 27c1001 is an 8 bit part. I was thinking of another issue with the GQ-4X and 27C4096 EPROMs. With that EPROM the write always fails, but if you select the 27C4002 instead it will program correctly.

Why don't you try programming it as a 27C210? That is actually a pin compatible equivalent to the 27C1024.

I just tried using 27C210, it also gives an error but it doesn't wrote any thing on to the chip unlike using 27C1024 (few lines of bad codes). I checked the device.txt and it looks 27C210 is base on 27C1024 entry. It just seem like the 27C1024 is borked on GQ-4X.

[Arthrimus]

I burned a AM27c1024 successfully last night with my GQ-4x4 using the AM27c1024 device entry. I'm running GQ Universal EPROM Programmer revision 7.17. I wonder if you have a different version of the software, or maybe specifically the ST part is incompatible.

[BuffaloWing]

I burned a AM27c1024 successfully last night with my GQ-4x4 using the AM27c1024 device entry. I'm running GQ Universal EPROM Programmer revision 7.17. I wonder if you have a different version of the software, or maybe specifically the ST part is incompatible.

I have the older version (does not have the x4 suffix) which has the last revision of 6.38 software. Perhaps they fixed it hardware wise on the x4 version. I think it's suppose to be a bit faster at least. I recalled their software are not compatible.