Double Hi Res on a IIe

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I've read that you need a rev-B IIe motherboard to be able to use double hi-res graphics.
I have an enhanced IIe (rev-A) on the workbench that can't display DHGR.

but what are the differences between the rev-A and the rev-B motherboard and is there anything that can be modified on the rev-A board in order to display DHGR properly?

[awanderin]

Post by ***@gmail.com
I've read that you need a rev-B IIe motherboard to be able to use double hi-res graphics.
I have an enhanced IIe (rev-A) on the workbench that can't display DHGR.
but what are the differences between the rev-A and the rev-B
motherboard and is there anything that can be modified on the rev-A
board in order to display DHGR properly?

Good summary and links here:

https://retrocomputing.stackexchange.com/questions/1034/what-was-the-change-to-the-apple-e-motherboard-that-allowed-for-double-hires-g


--
Jerry awanderin at gmail dot com