GQ 4x4 Programmer

[CoS72]

Hi All,

Does anyone use a GQ 4x4 USB programmer to burn M27C1024 eprom's ? I have the adapter required (ADP - 054) external power via the 9v jack and the latest software version (7.38). It will read and blank check without an issue but will not complete a write. Typically fails around 10% or sometimes makes it to 80% ... i have tried a number of ST branded IC's but always get a failed result.

I saw many threads online with various ideas and a good number of people who gave up and bought a TL866II instead.

Has anyone here managed to program these with the GQ ?

 

[Ace`]

These Chinese programmers were always hit or miss with larger roms. Years ago I made the mistake of buying a Top2048, the thing never worked right with larger roms. I remember reading a lot of issues people were having with GQ 4x4 too as I was going to upgrade my 3x3.

The trick is to buy 7 or 8 programmers to cover everything but as a first programmer the TL866II is probably a good choice.

 

[TheDaddy]

" Years ago I made the mistake of buying a Top2048 " - Same bloody mistake I made. Paid like £200 for it and its garbage !!! Keep meaning to put it up for sale in the hope someone is a daft as me and buys it.

As Ace said TL866 does 99% and are prety good for the price.

Dave.

 

[CoS72]

Thanks for the advice ... TL866 on order !

 

[Georgian2]

If it fails you can keep trying and ignore the error that the chip is not blank. You can't damage it by doing it.

 

[Retroman839]

I do
Mine works fine,

Yes I have programmed many
St M27c1024

Neo bios 4

Is the adaptor working ?

I have never needed external 9v power.

 

[CoS72]

I think its working .. you can read and and blank check ... it will start to write but typically fails around 10% although it has reached 80% a few times ... i have tried 6 eprom's all ST brand .. 2 from a different seller so i would be surprised if it was the IC's. Its actually a Uni BIOS i am trying to burn !

 

[Georgian2]

I think its working .. you can read and and blank check ... it will start to write but typically fails around 10% although it has reached 80% a few times ... i have tried 6 eprom's all ST brand .. 2 from a different seller so i would be surprised if it was the IC's. Its actually a Uni BIOS i am trying to burn !

Can you change the writing pulse time? If youndo make it a little longer.

 

[CoS72]

I have tried all 5 of the speeds available and it doesn't seem to make a difference in terms of a fail.. on this attempt 3 different eproms all failed at 0.45%

 

[CoS72]

Update ..... T48(TL866-3G) ordered and successful !

 

[Retroman839]

Shame your gx 4x4 didn’t work for you ..

 

[CoS72]

Its is frustrating and especially as yours works fine. Retro Chip tester to try to update next and then i might revisit this ...maybe try a different brand.

 

[Retroman839]

Its is frustrating and especially as yours works fine. Retro Chip tester to try to update next and then i might revisit this ...maybe try a different brand.

Might be the adaptor that’s faulty Try something that goes direct into the programmer ?