29 lines
743 B
ArmAsm
29 lines
743 B
ArmAsm
;; #LAYOUT# STD * #TAKE
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;; #LAYOUT# X16 BASIC_0 #TAKE-OFFSET 2000
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;; #LAYOUT# * BASIC_0 #TAKE
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;; #LAYOUT# * * #IGNORE
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; This file is under the MIT license, it contains code released by Microsoft Corporation.
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; See LICENSE for more information.
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; Math package - clear FAC1
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;
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; Set each byte of the mantissa of FAC1 to the value of A
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;
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; This is verified to be identical to the original Microsoft implementation where it was named CLRFAC.
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;
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; See also:
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; - https://www.c64-wiki.com/wiki/BASIC-ROM
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; - https://sta.c64.org/cbm64basconv.html
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;
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clear_FAC1:
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sta FAC1_mantissa+0
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sta FAC1_mantissa+1
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sta FAC1_mantissa+2
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sta FAC1_mantissa+3
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tay
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clear_FAC1_rts: ; Return point needed elsewhere
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rts
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