Pdp11/23+ EPROM upgrade
bqt at update.uu.se
Fri Feb 6 04:11:54 CST 2015
On 2015-02-05 19:49, Roe Peterson wrote:
> I want to update the EPROMs on my 11/23+, which currently has 2716s. I'm going to need 64k chips, and I understand 2764s won't work on this board.
> What are my replacement options? I have a fairly capable programmer, it can probably handle anything with 64k capacity.
??? I don't get it.
64K chips? The 11/23 currently uses the 2716, which is what? 2K (bytes)?
I doubt there are any more address lines going to that chip in the first
place, and second, the memory is mapped in the I/O space which have a
total of 8K, and that should cover not only the boot rom, but also all
CSRs of all devices you have in the machine. A 64K chip is going to be
So why are you looking for a 64K chip? (27512 I would assume that would
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