CREDIT CHECK: Difference between revisions

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== CREDIT_CHECK ($C00450) ==
== CREDIT_CHECK ($C00450) ==


[[BIOSes|BIOS]] routine called to check if there's enough credits for a player.
[[System ROM]] routine called to check if there's enough credits for a player.


Input: $10FDB0 ('''BIOS_CREDIT_DEC''') for player 1, and $10FDB1 ('''BIOS_CREDIT_DEC2''') for player 2.
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.