Onbekend, 00-00-00
Info DriveController (zeer beknopt)
7FF8 - READ: STATUSREGISTER
WRIT: COMMAND-REGISTER
7FF9 - TRACK REGISTER (AANGEVEN WELKE TRACK/ READ/WRITE)
7FFA - TRACK SECTOR REGISTER (AANGEVEN WELKE SECTOR/ READ/WRITE)
7FFB - DATA I/O "POORT"
7FFC - BIT 0 : SIDE (HEAD-CHOICE)
7FFD - DRIVE SELECT, MOTOR ON/OFF 128=DRIVE A AAN
129=DRIVE B AAN
&H7F=ALLE DRIV.UIT (ALLEEN DIE
VAN DEZE CONTROLLER!)
7FF8 / READ : BIT
7 NOT READY
6 WRITE PROTECT
5 HEADER LOADED
4 SEEK ERROR
3 CRC ERROR
2 TRACK 0 SIGNAL
1 INDEX PULSE
0 BUSY
7FF8 / WRITE : HIGH NIBBLE
1 = SEEK (IO=TRACK)
2 = STEP (LAST DIRECTION)
3 =
4 = STEP IN
5 =
6 = STEP OUT
7 =
8 = READ SECTOR (MUST BE FORMATTED)
9 =
A = WRITE SECTOR (MUST BE FORMATTED)
B =
C = READ ADDRESS
D = FORCE INTERRUPT
E = READ TRACK
F = WRITE TRACK
LOW NIBBLE : SPEED OF READING/WRITING
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