ROM dumping/burning newb woes

[big10p]

Figured it's about time to get to grips with this malarkey, so I've bought a T48 to dip my toes in the water.

First problem I've had is that I get an error trying to read a D27128-3. This is a ROM I pulled from a working board just to test with. I tried another type of EPROM which I managed to read ok.

T48 is USB powered so I tried a different port. I've updated the firmware, also.

Anyone with a T48 know what's up?

Thanks.

 

[Hexen]

Figured it's about time to get to grips with this malarkey, so I've bought a T48 to dip my toes in the water.

First problem I've had is that I get an error trying to read a D27128-3. This is a ROM I pulled from a working board just to test with. I tried another type of EPROM which I managed to read ok.

T48 is USB powered so I tried a different port. I've updated the firmware, also.

Anyone with a T48 know what's up?

Thanks.

A 27128 is about as standard as can be - as long as it's set to read a 128, it should without a problem. Maybe the device is dead?

 

[big10p]

A 27128 is about as standard as can be - as long as it's set to read a 128, it should without a problem. Maybe the device is dead?

Yeah, definitely set to read 27128 and the ROM works on the PCB I pulled it from. 🤷‍♂️

 

[Hexen]

Yeah, definitely set to read 27128 and the ROM works on the PCB I pulled it from. 🤷‍♂️

Dirty pins on the ZIF side? Sometimes I get errors as the PCB sockets use the sides of the chip pins, the ZIFs use the edges. T'was fun reading a 2708 the other day to copy it. Different checksum every time until the pins were individually cleaned with a scalpel.

I assume there are other Intel 27128s on the board that read OK?

 

[Jacmar]

Have you un-ticked the 'check ID' box ?

 

[big10p]

Dirty pins on the ZIF side? Sometimes I get errors as the PCB sockets use the sides of the chip pins, the ZIFs use the edges. T'was fun reading a 2708 the other day to copy it. Different checksum every time until the pins were individually cleaned with a scalpel.

I assume there are other Intel 27128s on the board that read OK?

I did try cleaning the pin edges with iso, but maybe they need a scrape. I'll give it a go. No other Intel chips on the board, but there is a Mitsubishi one. I'll see if I can read that. Cheers.

 

[big10p]

Have you un-ticked the 'check ID' box ?

I think it was ticked, but I'll check. I'm still learning this stuff so I don't know what all the options do, yet. Lol. Should it be un-ticked?

 

[Jacmar]

I generally have it un-ticked yes as otherwise it flags an error if the chip you put in doesn't match perfectly the make and model selected.

 

[big10p]

I generally have it un-ticked yes as otherwise it flags an error if the chip you put in doesn't match perfectly the make and model selected.

That solved it. It was passing pin detect but failing ID check, for some reason. I managed to dump the ROM and check it with RomIdent to check all's good. Thanks!

 

[Hexen]

I think it was ticked, but I'll check. I'm still learning this stuff so I don't know what all the options do, yet. Lol. Should it be un-ticked?

It should be OK for a read, writing it will matter more. Ah, I should read to the end!