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