| Routines

932B: Calculate the attribute file address for a piano key

Used by the routine at 92DC. Returns with the attribute file address in HL.
Input
A | Frequency parameter from the tune data table at 846E
932B | SUB $08 | 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)
932D | RRCA
932E | RRCA
932F | RRCA
9330 | CPL
9331 | OR $E0 | A=0xE0+K; this is the LSB
9333 | LD L,A | Set HL to the attribute file address for the piano key
9334 | LD H,$59
9336 | RET |