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PostPosted: Mon Jul 27, 2009 7:20 am 
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Hi guys,

I've got a pretty cool proto I'd like to dump and release, but I'm having a slight issue with my EPROM programmer. When I input what kind of chip I'm looking to read, I get this message:

<<HN27C301>>
This chip needs a wire jumper from Address header A23 to ZIF Pin24.

Can someone explain this to me in English? Is it more trouble than it's worth? I can wire up an MMC3 test board and pop these chips in if I have to, but I'd rather not go through all the work if I don't have to. I went through my proto pile and although I have like 10 MC3 protos, none have socketed chips so I can't swap them out.

Thanks for the help!


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PostPosted: Mon Jul 27, 2009 7:31 am 
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There's no A23 pin on an HN27C301 (they only go up to A16) so I'm not quite sure what it's saying there.


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PostPosted: Mon Jul 27, 2009 2:44 pm 
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If there is a header connector on the board (or the space for one), see if there is a 23rd pin to it or if it's labeled A, Address, or something. You may need the manual, or a schematic/wiring diagram that came with it.

Otherwise, I'd imagine it should work anyways if you're only wanting to read it. You could set it to 27C1001, 27C010 or whatnot if it's a 1mbit ROM. The special signals and stuff would generally be for programming it.


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PostPosted: Wed Jul 29, 2009 3:34 pm 
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Joined: Fri Jul 17, 2009 12:00 am
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mrmark0673 wrote:
<<HN27C301>>
This chip needs a wire jumper from Address header A23 to ZIF Pin24.


If you are using a Willem programmer then you need to use a piece of wire and put one end in the A23 pin on the "Address header" and put the other end into pin 24 of the ZIF socket. The A23 pin should be marked on the willem board.

Then you can put the eprom in and read it as a 27c301.

Depending on which version of the programmer you have, you might not have the necessary A23 pin.


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