Works fine, seen plenty of them installed OEM. I do a lot of PCM repairs.
AB28F400 are Boot Block flash memory from INTEL (since spun off to someone, can't recall who right now)
AM29F400 are Boot Block flash memory from AMD (since spun off memory business to Spansion), so IF you see a spansion part, probably a S29F400BB.
What you cannot use is a 29F400BT, those are Top Boot Block and configured differently and won't work properly.
B5, Bx, BB's all work fine. Same goes for the 29F800 and 28F800's. (AMD vs Intel).
I don't see too many AMD parts, they are the second source supplier. But I feel the AMD parts are a bit easier to program on my programmer. Intel parts are always fussy....
"The 16-Kbyte (16,384 bytes) boot
block is located at either the top (denoted by -T
suffix) or the bottom (-B suffix) of the address map
to accommodate different microprocessor protocols
for boot code location."