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Code Block |
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language | none |
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title | RST 20H, DEFW $1409 |
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IN:
ABC = internal format date (as returned by GN_Gmd)
(A is most significant byte, C is less significant byte)
OUT, if call successful:
Fc = 0
A = number of days in month (eg. 28 if date is in Feb 1989)
B = month (1 = January, 12 = December)
C =
C7 to C5: day of the week (1=Monday, 7=Sunday)
C4 to C0: day of the month (1 to 31)
DE = Signed year number (relative to 0 A.D.).
B.C. years are negative numbers.
OUT, if call failed:
Fc = 1 (no error code)
Date out of range (eg. beyond 32767 A.D.)
Registers changed after return:
......HL/IXIY same
AFBCDE../.... different |
GN_Dei, convert zoned external format date to internal format
GN_Gdt, convert an ASCII string to an internal binary date
GN_Gmd, Get (read) machine date in internal format
GN_Pdt, write internal date as ASCII string
GN_Pmd, put (set) machine date