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BobDevries

Senior Member

Joined: 08/06/2011
Location: Australia
Posts: 266

Posted: 02:15pm 05 Apr 2015

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Hi all,

I've been trying to programme a 27C256 using the Genius GS540, but it always errors out. I can't tell if it is hardware or software related.

I have a EPROM programmer for my Tandy Colour Computer, but that is limited to 27128 devices. I'd like to be able to programme 27C512 also, as well as being able to read other legacy devices such as 2716 2732 etc

Can someone suggest a not too expensive programmer which is KNOWN to do 27C256 (and other 27C devices)?

Regards, Bob Devries
Dalby, QLD, Australia

Bob Devries
Dalby, QLD, Australia

BobD

Guru

Joined: 07/12/2011
Location: Australia
Posts: 935

Posted: 03:45pm 05 Apr 2015

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Bob

All of those chips that you mention are supported devices on the GS540 unless the brand of chip you are using has some non standard timing characteristics.
http://www.pic16.com/soft/G540_DeviceList.txt

What is the precise error message?

Bob

bigmik

Guru

Joined: 20/06/2011
Location: Australia
Posts: 2949

Posted: 04:44pm 05 Apr 2015

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Bob,

If your programmer wont programme a 27c256 and you can spilt your HEX file into 2 equal halves (bottom and top half) a simple workaround would be to set for the 27C128 and programme the Bottom half (as if it was a 27C128) with the lower half of the HEX file and then pull out pin 27 and pull it high (enables the top half of the chip) and blast the 2nd half of your HEX file into the top half.. then your chip should work..

You need to be mindful of the programming voltages and select a 27c128 that is compatible with the chip you are trying to burn..

I am working on the assumption that pin 27 will be LOW when programming by default as it is required to be LOW for a 27C128.. I dont think any high voltages go to pin 27 as they are for pin 1..

Hope that helps you

Regards,

Mick

Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<

BobDevries

Senior Member

Joined: 08/06/2011
Location: Australia
Posts: 266

Posted: 06:59pm 05 Apr 2015

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All I get is Error****
The sequence is: Blank check, Program, verify.
It does the blank check, but errors on the program step.
My guess is that it is not generating the 12.5 volt programming voltage.

@mick I'll try your suggestion.

Regards, Bob Devries
Dalby, QLD, Australia

Bob Devries
Dalby, QLD, Australia

BrianD
Newbie

Joined: 06/05/2014
Location: New Zealand
Posts: 7

Posted: 01:12pm 06 Apr 2015

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With my Top2004 USB powered programmer, I found it unreliable when powered directly off the USB port which I assumed was due to the limits of the amount of current that a USB port can provide. I now use a 4 way USB hub that has it's own separate 2 amp power supply.

I haven't had any problems since then except that I am stuck using a windows xp machine as the drivers won't work in windows 7 which is a pain.

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