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Author Topic: Upgrading an A500 to KS40/68 wb3.1  (Read 2032 times)

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Offline alexh

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Re: Upgrading an A500 to KS40/68 wb3.1
« on: April 16, 2011, 06:06:34 PM »
Look at the 2.05 chip. Look at the 3.1 chip which didn't work. You should see a jumper wire on one and not the other... replicate the working one and voila.

Oh and it is 40.63 for A500 not 40.68!
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Offline alexh

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Re: Upgrading an A500 to KS40/68 wb3.1
« Reply #1 on: April 16, 2011, 07:24:21 PM »
Quote from: zipper;632042
rev5 and older do need a modification into the socket.
Not if they work with KS2.05 they don't. It would have already been done. Both 2.05 and 3.1 are 512Kbytes.

It's going to be the difference in EPROM chips, one will have had pins remapped the other not etc. or something like that.
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