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Fixed: it appears that the non-screen areas respect RAMRD and RAMWRT regardless of 80STORE.

Thomas Harte 2018-07-30 15:57:03 -04:00
parent 112e2c813b
commit fe509bfab2
1 changed files with 3 additions and 3 deletions
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6
Apple-IIe-Memory-Paging.md

@ -4,16 +4,16 @@ Apple provides multiple overlapping paging mechanisms which in total divide an A
Reading and writing: contains auxiliary RAM if `ALTZP` is set. Contains base RAM otherwise. Reading and writing: contains auxiliary RAM if `ALTZP` is set. Contains base RAM otherwise.
# 0300–0400; 0800–1000; 2000–C000 # 0300–0400; 0800–1000; 2000–C000
Reading: contains base RAM if `80STORE` is set or `RAMRD` is reset; contains auxiliary RAM otherwise. Reading: contains base RAM if `RAMRD` is reset; contains auxiliary RAM otherwise.
Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`. Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`.
# 0400–0800 # 0400–0800
Reading: contains auxiliary RAM if either (i) both `80STORE` and `PAGE` are set; or (ii) `80STORE` is reset and `RAMRD` is set. Contains base RAM otherwise. Reading: contains auxiliary RAM if either (i) both `80STORE` and `PAGE2` are set; or (ii) `80STORE` is reset and `RAMRD` is set. Contains base RAM otherwise.
Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`. Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`.
# 1000–2000 # 1000–2000
Reading: contains auxiliary RAM if either (i) `80STORE` and `PAGE` are set and `TEXT` is reset; or (ii) `80STORE` is reset and `RAMRD` is set. Contains base RAM otherwise. Reading: contains auxiliary RAM if either (i) `80STORE` and `PAGE2` are set, and `TEXT` is reset; or (ii) `80STORE` is reset and `RAMRD` is set. Contains base RAM otherwise.
Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`. Writing: as per reading, but regarding `RAMWRT` rather than `RAMRD`.