2 ms·

680[01]0 had only 23 address lines (A1-A23), 16-bit word size, thus 16 MB addressable memory. There’s also LDS (lower data select) and UDS pins for 8-bit I/O c

680[01]0 had only 23 address lines (A1-A23), 16-bit word size, thus 16 MB addressable memory. There’s also LDS (lower data select) and UDS pins for 8-bit I/O chips.

kstrauser 2y ago
Modern AMD64 CPUs only have around 48 address lines, but we don't describe them as 48 bit. Registers and pointers are 32 bit, too.
- wk_end 2y ago
  Likewise, the 6502 and Z80 had 16 address lines, but we never describe them as 16-bit.
  - ddingus 2y ago
    Right, it is generally about the ALU. It is hard to give registers too much weight, because both Moto designs used large registers.