On Sat, Dec 17, 2016 at 2:59 PM, Chuck Guzis <ccl...@sydex.com> wrote:
> What perplexed me is that the address of 0000 0 0 specified the first > bit in byte 0 of word 0, but that same bit was the *high order* bit in > the corresponding byte and word. It would seem to make more sense > reversing the significance of bits in a byte and bytes in a word such > that the lowest-numbered addresses corresponded to the least-significant > bits in a word or byte. > > Call it "extreme little endianess". Does anyone know of such an > architecture? > The IBM 7030 "Stretch" was bit-addressable for integer operations, but not for floating point or instructions. It used typical IBM big-endian bit numbering, with bit 0 being the most significant bit. The TI TMS34010 and TMS34020 graphics processors were bit-addressable, though instructions had to be 16-bit aligned. The TMS34010 and the default mode of the TMS34020 were little-endian, with bit 0 being the least significant bit. The TMS34020 has configurable support for big-endian memory addressing.
