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25 lines
606 B
ArmAsm
25 lines
606 B
ArmAsm
;
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; 2020-01-29, Greg King
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;
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; unsigned short get_numbanks (void);
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; /* Return the number of RAM banks that the machine has. */
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;
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; The Commander X16 version of MEMTOP returns with an extra value:
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; The accumulator describes the number of RAM banks that exist on the hardware.
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; A zero accumulator means that there are 256 RAM banks.
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;
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.export _get_numbanks
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.import MEMTOP
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_get_numbanks:
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sec
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jsr MEMTOP
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ldx #>$0000
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cmp #<$0100 ; are there 256 banks?
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bne :+
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inx ; yes
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: rts
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