Commodore Amiga A2000 - Registers Used by the Disk Subsystem; Figure 8-7 Chinon Timing Diagram

REGISTERS USED BY THE DISK SUBSYSTEM
The disk subsystem uses two ports on the system's 8520 CIA chips, and several registers
in the Paula chip:
CIAAPRA ($BFE001) four input bits for disk sensing
CIABPRB ($BFD100) eight output bits for disk selection,
control and stepping
ADKCON ($DFF09E) control bits (write only register)
ADKCONR ($DFF010) control bits (read only register)
DSKPTH ($DFF020) DMA pointer (32 bits)
DSKLEN ($DFF024) length of DMA
DSKBYTR ($DFFOlA) Disk data byte and status read
DSKSYNC ($DFF07E) Disk sync finder; holds a match word
Figure 8-7: Chinon Timing diagram
- 236 Interface hardware -