Apple-2-SW/a2audit
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a2audit/audit/notes.org
Zellyn Hunter 5598661ff6 langcard: fixed current tests
2016-12-17 20:49:28 -05:00

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Common bytes in FP and INT D0 ROMS

D17B 53 D1B3 54 D267 54 D273 54 D307 20 D32A 20 D337 20 D347 20 D51C 00 D57C F0 D665 20 D667 D6 D694 85 D69B FF D6DC B1 D6F7 84 D729 4C D72B D7 D747 F0 D74B D7 D768 85 D76E 65

Links to things to test

TODO csa2: question on HGR behavior with enhanced 128K Apple //e

Language card operation

Bank 2 Bank 1 Action RAM Alt Bank 2 Alt Bank 1
C080 C088 R/W WRTCOUNT=0 READ ENABLE C084 C08C
C081 C089 R WRTCOUNT++ READ DISABLE C085 C08D
W WRTCOUNT=0 READ DISABLE
C082 C08A R/W WRTCOUNT=0 READ DISABLE C086 C08E
C083 C08B R WRTCOUNT++ READ ENABLE C087 C08F
W WRTCOUNT=0 READ ENABLE

Writing to high RAM is enabled when WRTCOUNT >= 2 Source: UtA2e, pg 5-24.