Instruction manual

fb57 3a 35 fc LD A,(diskno)

fb5a 6f LD l, a ;l=disk number 0, 1, 2, 3

fb5b 26 00 LD h, 0 ;high order zero

fb5d 29 ADD HL,HL ;*2

fb5e 29 ADD HL,HL ;*4

fb5f 29 ADD HL,HL ;*8

fb60 29 ADD HL,HL ;*16 (size of each header)

fb61 11 33 fa LD DE, dpbase

fb64 19 ADD HL,DE ;hl=,dpbase (diskno*16) Note typo here in original source.

fb65 c9 ret

fb66 ;

fb66 settrk: ;set track given by register c

fb66 79 LD a, c

fb67 32 2f fc LD (track),A

fb6a c9 ret

fb6b ;

fb6b setsec: ;set sector given by register c

fb6b 79 LD a, c

fb6c 32 31 fc LD (sector),A

fb6f c9 ret

fb70 ;

fb70 sectran:

fb70 ;translate the sector given by bc using the

fb70 ;translate table given by de

fb70 eb EX DE,HL ;hl=.trans

fb71 09 ADD HL,BC ;hl=.trans (sector)

fb72 c9 ret ;debug no translation

fb73 6e LD l, (hl) ;l=trans (sector)

fb74 26 00 LD h, 0 ;hl=trans (sector)

fb76 c9 ret ;with value in hl

fb77 ;

fb77 setdma: ;set dma address given by registers b and c

fb77 69 LD l, c ;low order address

fb78 60 LD h, b ;high order address

fb79 22 33 fc LD (dmaad),HL ;save the address

fb7c c9 ret

fb7d ;

fb7d read:

fb7d ;Read one CP/M sector from disk.