$D44D/54349:   Read next block

Jump from $C629, $C8B0, $EE07:

D44D: 20 93 DF  JSR $DF93       ; get buffer number
D450: 0A        ASL             ; times 2
D451: AA        TAX
D452: A9 00     LDA #$00
D454: 95 99     STA $99,X       ; buffer pointer to zero
D456: A1 99     LDA ($99,X)     ; get first byte from buffer
D458: F0 05     BEQ $D45F       ; no block following?
D45A: D6 99     DEC $99,X       ; buffer pointer to -1
D45C: 4C 56 D1  JMP $D156       ; read next block

Jump from $D458:

D45F: 60        RTS

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