>I need 512k x 8 storage space which can be done with a single
>29C040A Flash. The quoted figure for Flash is > 10,000 write
>cycles. I "might" have a look at battery backed-up SRAM, I've a
>few 8M TSOPs, but truly NV is preferable

You may like to look at the maxim/Dallas DS1251 which is a 512k byte battery
backed SRAM with phantom clock. Appreciate you don't need the clock, and it
does not take address space. Comes in 32 pin dip or 34 pin powercap formats.

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