[sdiy] transistion from 7489/74189 to more modern ram??

[Tom Wiltshire]

On 19 Dec 2011, at 11:19, Rainer Buchty wrote:

> Along the lines of replacing 74(1)89, I wonder if it isn't just way cheaper to create a little VHDL design which abuses an FPGA's BlockRAM and SelectRAM -- forming the desired amount of 74(1)89 lookalikes -- together with some level shifters. (Or, in worst case, go for something like M4A-64/32 as single-chip replacement.)
> 
> Rainer
> 

If you're going to that much trouble, you should replace the rest of the external logic too and do the whole thing as a digital project, since that's what it is. And FPGAs are only one of your solutions at that point.

Regards,
Tom