I think the poster was saying that what pushed 32-bit out of spotlight , and 64-bit into spotlight ??
Because System Software Developer were complaining that value of 64-bit is not Null but Zero ; Perhaps Minus .
? AMD about 10 year ago announced the first 64-bit Design with Intel following within 1 year and 1.5 year ?
32-bit 386 has Cache , or Extended Memory , in the 486 . Then access to transient memory store or RAM does not require a 64-bit Microprocessor because
64-bit nomer or name is just the internal memory or Register Memory . Which is expensive .
Microprocessor have addressed to MMC or Memory Management Control ( a multiplex circuit ) .
Would of been doable has augment to System V as Monolithic Kernel and perhap maintained as Lithic Microkernel .