chris
a45f63e34e
cc65's C64 runtime and ip65 call past the jump table: $E5B4 takes the first key from the keyboard buffer (cgetc), $EA24 points USER at the colour RAM of PNT's line (cursor positioning), and $ECF0 holds the low bytes of the screen lines' addresses (ip65's VT100 code), as Mapping the Commodore 64 describes them. vicii_init's work moves out of $E5A0-$E5C8 to free $E5B4, and on the standard layout PNT and USER are worked out through the routine at $EA24.
22 lines
384 B
ArmAsm
22 lines
384 B
ArmAsm
;; #LAYOUT# STD * #TAKE
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;; #LAYOUT# * * #IGNORE
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;
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; Well-known Kernal routine, described in:
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;
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; - [CM64] Computes Mapping the Commodore 64 - $E5B4, LP2
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;
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; Takes the first key from the keyboard buffer, which must not be empty, and moves the
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; others up. Out: the key in A. X is kept.
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;
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get_from_keyboard_buffer:
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lda KEYD
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pha
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jsr pop_keyboard_buffer
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pla
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rts
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