t****t
发帖数: 6806 | 1 0 page address can be encoded with 8 bit as opposed to 16bit. so the default
ROM uses a lot of 0page address as "backup" registers, since only 3 general
purpose registers (A/X/Y) are available. Those address in [c000-cfff] are
for I/O purpose only, i.e. memory-mapped I/O. so called "soft switch" are in
this range. |
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