“ Direct Page Register One of the things that had made the 6502 so successful, was its extensive use of ‘zero page’, or memory locations 0 to 255. With a very

“ Direct Page Register One of the things that had made the 6502 so successful, was its extensive use of ‘zero page’, or memory locations 0 to 255. With a very limited number of registers, the 6502 relied on the use of ‘zero page’ to access frequently used values. Access to these values was faster as only a single address byte was needed to specify the address. The 6809 enhanced the use of the zero page by adding a new 8-bit ‘Direct Page’ register which allowed the ‘zero page’ to be moved to anywhere in the 16-bit address space.” From https://thechipletter.substack.com/p/motorolas-6809-the-best-8-bit https://thechipletter.substack.com/p/motorolas-6809-the-best...