MCUmall EPROM BIOS Chip Burner Forum
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T O P I C    R E V I E W
orangestorm87 Posted - 08/21/2025 : 10:47:20
I am tinkering with old Allen Bradley industrial controllers. When I say old, there is basically no information on the net and any contact I do find does not have any experience with the hardware or simply doesn't believe it exists.

Even so I thought getting it up and running might be fun. The device I am currently working on is programmed by writing to individual 24 pin chips and placed in sockets on its memory board before powering up.

I can't find an actual programmer for this from back in the day so I was hoping to use a GQ-4X4 to dump the contents (if there is anything left) from the chips.

The problem is I don't exactly know what kind of chips they are. The only markings are a small Motorola "M" symbol along with "Allen Bradley Memory Element 1750-BE". Where the 1750-BE is the Allen Bradley part number.

Does the GQ-4x4 have any ability to identify the chip that is placed into it? Or would it be a guess and check through the list of supported Motorola chips?
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anniel Posted - 08/22/2025 : 06:39:55
quote:
Originally posted by orangestorm87

I am tinkering with old Allen Bradley industrial controllers. When I say old, there is basically no information on the net and any contact I do find does not have any experience with the hardware or simply doesn't believe it exists.

Even so I thought getting it up and running might be fun. The device I am currently working on is programmed by writing to individual 24 pin chips and placed in sockets on its memory board before powering up.

I can't find an actual programmer for this from back in the day so I was hoping to use a GQ-4X4 to dump the contents (if there is anything left) from the chips.

The problem is I don't exactly know what kind of chips they are. The only markings are a small Motorola "M" symbol along with "Allen Bradley Memory Element 1750-BE". Where the 1750-BE is the Allen Bradley part number.

Does the GQ-4x4 have any ability to identify the chip that is placed into it? Or would it be a guess and check through the list of supported Motorola chips?

Try 28C16.

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