CREDIT CHECK: Difference between revisions
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== CREDIT_CHECK ($C00450) == | |||
Input: | [[System ROM]] routine called to check if there's enough credits for a player. | ||
Input: Credits necessary in {{BR|BIOS_CREDIT_DEC1}} for player 1, and {{BR|BIOS_CREDIT_DEC2}} for player 2. | |||
Those locations are set to 0 if there aren't enough credits. | Those locations are set to 0 if there aren't enough credits. | ||
Call [[CREDIT_DOWN]] after. | Call [[CREDIT_DOWN]] after. | ||
Credits count are located in [[backup RAM]] at $D00034 and $D00035. Only the system ROM should use these locations directly. | |||
[[Category:BIOS calls]] | [[Category:BIOS calls]] | ||
Latest revision as of 05:25, 28 February 2017
CREDIT_CHECK ($C00450)
System ROM routine called to check if there's enough credits for a player.
Input: Credits necessary in BIOS_CREDIT_DEC1 ( $10FDB0) for player 1, and BIOS_CREDIT_DEC2 ( $10FDB1) for player 2. Those locations are set to 0 if there aren't enough credits.
Call CREDIT_DOWN after.
Credits count are located in backup RAM at $D00034 and $D00035. Only the system ROM should use these locations directly.