Changes

  Command Parameters Exm Result Description 02+MF+SK HU TR HD ?? SZ NM GP SL <R> S0 S1 S2 TR HD NM SZ read track 03 XX YY - specify spd/dma 04 HU - S3 sense drive state 05+MT+MF HU TR HD SC SZ LS GP SL <W> S0 S1 S2 TR HD LS SZ write sector(s) 06+MT+MF+SK HU TR HD SC SZ LS GP SL <R> S0 S1 S2 TR HD LS SZ read sector(s) 07 HU - recalib.seek TP=0 08 - - S0 TP sense interrupt state 09+MT+MF HU TR HD SC SZ LS GP SL <W> S0 S1 S2 TR HD LS SZ write deleted sector(s) 0A+MF HU - S0 S1 S2 TR HD LS SZ read ID 0C+MT+MF+SK HU TR HD SC SZ LS GP SL <R> S0 S1 S2 TR HD LS SZ read deleted sector(s) 0D+MF HU SZ NM GP FB <W> S0 S1 S2 TR HD LS SZ format track 0F HU TP - seek track n 11+MT+MF+SK HU TR HD SC SZ LS GP SL <W> S0 S1 S2 TR HD LS SZ scan equal 19+MT+MF+SK HU TR HD SC SZ LS GP SL <W> S0 S1 S2 TR HD LS SZ scan low or equal 1D+MT+MF+SK HU TR HD SC SZ LS GP SL <W> S0 S1 S2 TR HD LS SZ scan high or equal Parameter bits that can be specified in some Command Bytes areNotes:  MT Bit7 Multi * Format Track (continue multi-sector-function on other head) MF Bit6 MFM-Mode-Bit (Default 1=Double Density) SK Bit5 Skip-Bit (set if secs with deleted DAM shall be skipped) Parameter/Result bytes are:  HU b0The processor must supply C,1=Unit/Drive NumberH, b2=Physical Head NumberR, other bits zero TP Physical Track Number TR Track-ID (usually same value as TP) HD Head-ID SC First Sector-ID (sector you want N to read) SZ Sector Size (80h shl n) (default=02h for 200h bytes) LS Last Sector-ID (should be same as SC when reading a single sector) GP Gap (default=2Ah except command 0D: default=52h) SL Sectorlen if SZ=0 (default=FFh) Sn Status Register 0..3 FB Fillbyte (for the sector data areas) (default=E5h) NM Number of Sectors (default=09h) XX b0..3=headunload n*32ms (8" only), b4..7=steprate (16-n)*2ms YY b0=DMA_disable, b1-7=headload n*4ms (8" only) * Format Track: output TR,HD,SC,SZ FDC for each sector during execution phase* Read Track: reads NM sectors (starting with first sec past index hole)* Read ID: read ID bytes for current sec, repeated/undelayed read lists all IDs* RecalibRecalibrate: walks Walks up to 77 tracks, 80tr-drives may need second recalib if failed* Seek/RecalibRecalibrate: All read/write commands will be disabled until succesful senseint* Senseint: Set's IC if unsuccesful (no int has occured) (until IC=0)sense interrupt