Re: DRAM chip spacing

> Thanks for the reply. I already knew 407 got different spacing. Maybe
> someone can verify it's the only one.
The 298 mobo appears to have slightly different spacing as well. It's 
the same width as the 425, but taller like the 407, but not exactly the 
same height (a bit taller, from what I can see)
>
> I checked your Github project.
> What do you mean by "Care has been taken to preserve the relative
> order, so D0 on the 4164 and D0 on the 4464 should be the same."?
> You can mix address pins together and data pins together and the
> memory works the same. Some SRAM/DRAM datasheets don't even number the
> address or data pins.
That's true, but my goal was to create an adapter for my 2MB/8MB SRAM 
expansion, which needs the address and data pins arranged in the same 
way as the CPU, to allow the various MMU addresses and data values to 
make sense. As such, I needed D0 on the motherboard to be D0 inot the 
SRAM module.
> I used this to make the layout easier. I enabled pin swap function
> between address pins and between data pins.
Which is fine if you're just making a board with some SRAM on it. But, I 
was making an adapter, and I didn't want to assume anything about the 
module that will be plugged in.
>
> -Pasi
>

-- 
Jim Brain
brain_at_jbrain.com
www.jbrain.com