2016-12-14 02:26:18 +00:00
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* Common bytes in FP and INT D0 ROMS
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D17B 53
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D1B3 54
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D267 54
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D273 54
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D307 20
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D32A 20
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D337 20
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D347 20
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D51C 00
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D57C F0
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D665 20
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D667 D6
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D694 85
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D69B FF
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D6DC B1
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D6F7 84
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D729 4C
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D72B D7
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D747 F0
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D74B D7
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D768 85
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D76E 65
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2016-12-15 01:16:55 +00:00
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* Links to things to test
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** TODO [[https://groups.google.com/d/msg/comp.sys.apple2/RMnus8p6xp8/TDfD2HVtDwAJ][csa2: question on HGR behavior with enhanced 128K Apple //e]]
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2016-12-18 01:49:28 +00:00
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* Language card operation
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| Bank 2 | Bank 1 | | Action | RAM | Alt Bank 2 | Alt Bank 1 |
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|--------+--------+-----+------------+--------------+------------+------------|
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| C080 | C088 | R/W | WRTCOUNT=0 | READ ENABLE | C084 | C08C |
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| C081 | C089 | R | WRTCOUNT++ | READ DISABLE | C085 | C08D |
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| | | W | WRTCOUNT=0 | READ DISABLE | | |
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| C082 | C08A | R/W | WRTCOUNT=0 | READ DISABLE | C086 | C08E |
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| C083 | C08B | R | WRTCOUNT++ | READ ENABLE | C087 | C08F |
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| | | W | WRTCOUNT=0 | READ ENABLE | | |
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Writing to high RAM is enabled when WRTCOUNT >= 2
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Source: UtA2e, pg 5-24.
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