?? fdreg.h
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/* * This file contains some defines for the floppy disk controller. * Various sources. Mostly "IBM Microcomputers: A Programmers * Handbook", Sanches and Canton. */#ifndef _FDREG_H#define _FDREG_Hextern int ticks_to_floppy_on(unsigned int nr);extern void floppy_on(unsigned int nr);extern void floppy_off(unsigned int nr);extern void floppy_select(unsigned int nr);extern void floppy_deselect(unsigned int nr);/* Fd controller regs. S&C, about page 340 */#define FD_STATUS 0x3f4#define FD_DATA 0x3f5#define FD_DOR 0x3f2 /* Digital Output Register */#define FD_DIR 0x3f7 /* Digital Input Register (read) */#define FD_DCR 0x3f7 /* Diskette Control Register (write)*//* Bits of main status register */#define STATUS_BUSYMASK 0x0F /* drive busy mask */#define STATUS_BUSY 0x10 /* FDC busy */#define STATUS_DMA 0x20 /* 0- DMA mode */#define STATUS_DIR 0x40 /* 0- cpu->fdc */#define STATUS_READY 0x80 /* Data reg ready *//* Bits of FD_ST0 */#define ST0_DS 0x03 /* drive select mask */#define ST0_HA 0x04 /* Head (Address) */#define ST0_NR 0x08 /* Not Ready */#define ST0_ECE 0x10 /* Equipment chech error */#define ST0_SE 0x20 /* Seek end */#define ST0_INTR 0xC0 /* Interrupt code mask *//* Bits of FD_ST1 */#define ST1_MAM 0x01 /* Missing Address Mark */#define ST1_WP 0x02 /* Write Protect */#define ST1_ND 0x04 /* No Data - unreadable */#define ST1_OR 0x10 /* OverRun */#define ST1_CRC 0x20 /* CRC error in data or addr */#define ST1_EOC 0x80 /* End Of Cylinder *//* Bits of FD_ST2 */#define ST2_MAM 0x01 /* Missing Addess Mark (again) */#define ST2_BC 0x02 /* Bad Cylinder */#define ST2_SNS 0x04 /* Scan Not Satisfied */#define ST2_SEH 0x08 /* Scan Equal Hit */#define ST2_WC 0x10 /* Wrong Cylinder */#define ST2_CRC 0x20 /* CRC error in data field */#define ST2_CM 0x40 /* Control Mark = deleted *//* Bits of FD_ST3 */#define ST3_HA 0x04 /* Head (Address) */#define ST3_TZ 0x10 /* Track Zero signal (1=track 0) */#define ST3_WP 0x40 /* Write Protect *//* Values for FD_COMMAND */#define FD_RECALIBRATE 0x07 /* move to track 0 */#define FD_SEEK 0x0F /* seek track */#define FD_READ 0xE6 /* read with MT, MFM, SKip deleted */#define FD_WRITE 0xC5 /* write with MT, MFM */#define FD_SENSEI 0x08 /* Sense Interrupt Status */#define FD_SPECIFY 0x03 /* specify HUT etc *//* DMA commands */#define DMA_READ 0x46#define DMA_WRITE 0x4A#endif
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