Routines
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37675: Calculate the attribute file address for a piano key
Used by the routine at 37596. Returns with the attribute file address in HL.
Input
A Frequency parameter from the tune data table at 33902
37675 SUB 8 Compute the piano key index (K) based on the frequency parameter (F), and store it in bits 0-4 of A: K=31-INT((F-8)/8)
37677 RRCA
37678 RRCA
37679 RRCA
37680 CPL
37681 OR 224 A=224+K; this is the LSB
37683 LD L,A Set HL to the attribute file address for the piano key
37684 LD H,89
37686 RET
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