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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
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Tuco

Australia
18 Posts
Posted - 11/13/2017 :  12:26:19  Show Profile  Reply with Quote
Hello,

Progrmamer - GQ-4X

I'm trying to replace 2 EPROMs (M27V322 and M27V160) in an old machine.
I've got a dumps of the original chips and the data writes but the unused bits stay at FF.

The problem is the system does a checksum and sees the unused as FF instead of 00 (as in the original chips) and the checksum fails so the device will not boot.

Is there a way of writing those unused as 00 instead of them being left as FF?

Is it as simple as me missing a setting in the programmer?

Michael.
Reply #1

Tuco

Australia
18 Posts
Posted - 11/13/2017 :  22:41:49  Show Profile  Reply with Quote
Can I delete my thread? This issue has been resolved.
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Reply #2

anniel

2572 Posts
Posted - 11/17/2017 :  07:56:02  Show Profile  Reply with Quote
quote:
Originally posted by Tuco

Hello,

Progrmamer - GQ-4X

I'm trying to replace 2 EPROMs (M27V322 and M27V160) in an old machine.
I've got a dumps of the original chips and the data writes but the unused bits stay at FF.

The problem is the system does a checksum and sees the unused as FF instead of 00 (as in the original chips) and the checksum fails so the device will not boot.

Is there a way of writing those unused as 00 instead of them being left as FF?

Is it as simple as me missing a setting in the programmer?

Michael.


Yes you simply need to use "Fill Buffer Hex" in the edit menu.
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Reply #3

anniel

2572 Posts
Posted - 11/17/2017 :  07:58:12  Show Profile  Reply with Quote
quote:
Originally posted by Tuco

Can I delete my thread? This issue has been resolved.


No, please don't delete and explain how you resolved. It could help other members of the community.
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Reply #4

Tuco

Australia
18 Posts
Posted - 11/22/2017 :  19:35:40  Show Profile  Reply with Quote
quote:
Originally posted by anniel

quote:
Originally posted by Tuco

Can I delete my thread? This issue has been resolved.


No, please don't delete and explain how you resolved. It could help other members of the community.

It was resolved because I didn't realise that the adaptor for my GQ-4X had to be modified running 3 wires for addresses A19 to A21 from the main unit board to the adaptor board for M27V32 and M27V160 chips.
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Reply #5

anniel

2572 Posts
Posted - 11/23/2017 :  04:24:47  Show Profile  Reply with Quote
quote:
Originally posted by Tuco

quote:
Originally posted by anniel

quote:
Originally posted by Tuco

Can I delete my thread? This issue has been resolved.


No, please don't delete and explain how you resolved. It could help other members of the community.

It was resolved because I didn't realise that the adaptor for my GQ-4X had to be modified running 3 wires for addresses A19 to A21 from the main unit board to the adaptor board for M27V32 and M27V160 chips.


With the GQ-4X if you have the right adapter and the 4 pins have not been cut you do not need the jumper wires. It works via the ZIF.
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