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constants.h
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#ifndef PDD_CONSTANTS_H
#define PDD_CONSTANTS_H
#include <stdint.h>
// TPDD drive firmware/protocol constants
// TPDD request block formats
#define REQ_DIRENT 0x00 // (add 0x40 for TPDD2 bank 1)
#define REQ_OPEN 0x01 // (add 0x40 for TPDD2 bank 1)
#define REQ_CLOSE 0x02 // (add 0x40 for TPDD2 bank 1)
#define REQ_READ 0x03 // (add 0x40 for TPDD2 bank 1)
#define REQ_WRITE 0x04 // (add 0x40 for TPDD2 bank 1)
#define REQ_DELETE 0x05 // (add 0x40 for TPDD2 bank 1)
#define REQ_FORMAT 0x06
#define REQ_STATUS 0x07 // (add 0x40 for undocumented synonym on TPDD2)
#define REQ_FDC 0x08 // TPDD1
#ifdef NADSBOX_EXTENSIONS
#define REQ_NADSBOX_SEEK 0x09
#define REQ_NADSBOX_TELL 0x0A
#define REQ_NADSBOX_SET_EXT 0x0B
#endif
#define REQ_CONDITION 0x0C // TPDD2
#define REQ_RENAME 0x0D // TPDD2 (add 0x40 for bank 1)
#ifdef NADSBOX_EXTENSIONS
#define REQ_NADSBOX_GET_EXT 0x0E
#define REQ_NADSBOX_COND_LIST 0x0F // NADSBox but TPDD2 also responds with RET_CACHE
#endif
#define REQ_VERSION 0x23 // TPDD2 Get Version Number
#define REQ_CACHE 0x30 // TPDD2 sector access
#define REQ_MEM_WRITE 0x31 // TPDD2 sector access
#define REQ_MEM_READ 0x32 // TPDD2 sector access
#define REQ_SYSINFO 0x33 // TPDD2 Get System Information
#define REQ_EXEC 0x34 // TPDD2 Execute Program
// TPDD return block formats {fmt,len}
#define RET_READ 0x10
static const uint8_t RET_DIRENT[2] = {0x11,0x1C};
static const uint8_t RET_STD[2] = {0x12,0x01}; // shared return format for: error open close delete status write
static const uint8_t RET_VERSION[2] = {0x14,0x0F}; // TPDD2
static const uint8_t RET_CONDITION[2] = {0x15,0x01}; // TPDD2
static const uint8_t RET_CACHE[2] = {0x38,0x01}; // TPDD2 shared return format for: cache mem_write cond_list
#define RET_MEM_READ 0x39 // TPDD2
static const uint8_t RET_SYSINFO[2] = {0x3A,0x06}; // TPDD2
static const uint8_t RET_EXEC[2] = {0x3B,0x03}; // TPDD2
// directory entry request types
#define DIRENT_SET_NAME 0x00
#define DIRENT_GET_FIRST 0x01
#define DIRENT_GET_NEXT 0x02
#define DIRENT_GET_PREV 0x03 // TPDD2
#define DIRENT_CLOSE 0x04 // TPDD2
// file open access modes
#define F_OPEN_NONE 0x00 // used in here, not part of protocol
#define F_OPEN_WRITE 0x01
#define F_OPEN_APPEND 0x02
#define F_OPEN_READ 0x03
// TPDD Operation-mode error codes
// Normal
#define ERR_SUCCESS 0x00 // 'Operation Complete'
// File
#define ERR_NO_FILE 0x10 // 'File Not Found'
#define ERR_EXISTS 0x11 // 'File Exists'
// Sequence
#define ERR_NO_FNAME 0x30 // 'Missing Filename'
#define ERR_DIR_SEARCH 0x31 // 'Directory Search Error'
#define ERR_BANK 0x35 // 'Bank Error'
#define ERR_PARAM 0x36 // 'Parameter Error'
#define ERR_FMT_MISMATCH 0x37 // 'Open Format Mismatch'
#define ERR_EOF 0x3F // 'End of File'
// Disk I/O
#define ERR_NO_START 0x40 // 'No Start Mark'
#define ERR_ID_CRC 0x41 // 'ID CRC Check Error'
#define ERR_SECTOR_LEN 0x42 // 'Sector Length Error'
#define ERR_FMT_VERIFY 0x44 // 'Format Verify Error'
#define ERR_NOT_FORMATTED 0x45 // 'Disk Not Formatted'
#define ERR_FMT_INTERRUPT 0x46 // 'Format Interruption'
#define ERR_ERASE_OFFSET 0x47 // 'Erase Offset Error'
#define ERR_DATA_CRC 0x49 // 'DATA CRC Check Error'
#define ERR_SECTOR_NUM 0x4A // 'Sector Number Error'
#define ERR_READ_TIMEOUT 0x4B // 'Read Data Timeout'
#define ERR_SECTOR_NUM2 0x4D // 'Sector Number Error'
// Protect
#define ERR_WRITE_PROTECT 0x50 // 'Write-Protected Disk'
#define ERR_DISK_NOINIT 0x5E // 'Disk Not Formatted'
#define ERR_WP_TPDD1_DISK 0x5F // TPDD2 'Write Protect to 26-3808 Diskette'
// File Territory
#define ERR_DIR_FULL 0x60 // 'Disk Full or Max File Size Exceeded or Directory Full' / TPDD2 'Directory Full'
#define ERR_DISK_FULL 0x61 // 'Disk Full'
#define ERR_FILE_LEN 0x6E // 'File Too Long' (real drive limits to 65534, we exceed for REXCPM)
// Diskette Condition
#define ERR_NO_DISK 0x70 // 'Disk Not Inserted'
#define ERR_DISK_CHG 0x71 // 'Disk Change Error'
// Sensor
#define ERR_NO_INDEX_SIGNAL 0x80
#define ERR_ABNORMAL_TRACK_ZERO 0x81
#define ERR_ABNORMAL_INDEX_SIGNAL 0x82
#define ERR_DEFECTIVE 0x83 // 'Defective Disk' - real drive needs a power-cycle to clear this error - not in the manual
// TPDD1 FDC-mode commands
#define FDC_SET_MODE 'M' // set Operation-mode or FDC-mode
#define FDC_CONDITION 'D' // drive condition
#define FDC_FORMAT 'F' // format disk
#define FDC_FORMAT_NV 'G' // format disk without verify
#define FDC_READ_ID 'A' // read sector ID
#define FDC_READ_SECTOR 'R' // read sector data
#define FDC_SEARCH_ID 'S' // search sector ID
#define FDC_WRITE_ID 'B' // write sector ID
#define FDC_WRITE_ID_NV 'C' // write sector ID without verify
#define FDC_WRITE_SECTOR 'W' // write sector data
#define FDC_WRITE_SECTOR_NV 'X' // write sector data without verify
static const char FDC_CMDS[] = {FDC_SET_MODE,FDC_CONDITION,FDC_FORMAT,FDC_FORMAT_NV,FDC_READ_ID,FDC_READ_SECTOR,FDC_SEARCH_ID,FDC_WRITE_ID,FDC_WRITE_ID_NV,FDC_WRITE_SECTOR,FDC_WRITE_SECTOR_NV,0x00};
// TPDD1 FDC-mode error codes
// There is no documentation for FDC error codes.
// These are guesses from experimenting.
// These appear in the first hex pair of an 8-byte FDC-mode response.
#define ERR_FDC_SUCCESS 0x00 // 'OK'
#define ERR_FDC_LSN_LO 0x11 // 'Logical Sector Number Below Range'
#define ERR_FDC_LSN_HI 0x12 // 'Logical Sector Number Above Range'
#define ERR_FDC_PSN_HI 0x13 // 'Physical Sector Number Above Range'
#define ERR_FDC_PARAM 0x21 // 'Parameter Invalid, Wrong Type'
#define ERR_FDC_LSSC_LO 0x32 // 'Invalid Logical Sector Size Code'
#define ERR_FDC_LSSC_HI 0x33 // 'Logical Sector Size Code Above Range'
#define ERR_FDC_ID_NOT_FOUND 0x3C // 'ID Not Found'
#define ERR_FDC_S_BAD_PARAM 0x3D // 'Search ID Unexpected Parameter'
#define ERR_FDC_NOT_FORMATTED 0xA0 // 'Disk Not Formatted'
#define ERR_FDC_READ 0xA1 // 'Read Error'
#define ERR_FDC_WRITE_PROTECT 0xB0 // 'Write-Protected Disk'
#define ERR_FDC_COMMAND 0xC1 // 'Invalid Command'
#define ERR_FDC_NO_DISK 0xD1 // 'Disk Not Inserted'
#define ERR_FDC_INTERRUPTED 0xD8 // 'Operation Interrupted'
// TPDD1 FDC Logical Sector Length Codes
static const uint16_t FDC_LOGICAL_SECTOR_SIZE[7] = {64,80,128,256,512,1024,1280};
// TPDD1 Condition bits
#define PDD1_COND_BIT_NOTINS 7 // disk not inserted
#define PDD1_COND_BIT_CHANGED 6 // disk changed
#define PDD1_COND_BIT_WPROT 5 // disk write-protected
#define PDD1_COND_BIT_4 4
#define PDD1_COND_BIT_3 3
#define PDD1_COND_BIT_2 2
#define PDD1_COND_BIT_1 1
#define PDD1_COND_BIT_0 0
#define PDD1_COND_NONE 0x00 // no conditions
// TPDD2 Condition bits
#define PDD2_COND_BIT_7 7
#define PDD2_COND_BIT_6 6
#define PDD2_COND_BIT_5 5
#define PDD2_COND_BIT_4 4
#define PDD2_COND_BIT_CHANGED 3 // disk changed
#define PDD2_COND_BIT_NOTINS 2 // disk not inserted
#define PDD2_COND_BIT_WPROT 1 // disk write protected
#define PDD2_COND_BIT_POWER 0 // low power
#define PDD2_COND_NONE 0x00 // no conditions
// lengths & addresses
#define PDD1_TRACKS 40
#define PDD1_SECTORS 2
#define PDD2_TRACKS 80
#define PDD2_SECTORS 2
#define DIRENTS 40
#define REQ_RW_DATA_MAX 128 // largest chunk size in req_read() req_write()
#define TPDD_FILENAME_LEN 24
#define LOCAL_FILENAME_MAX 256
#define SECTOR_ID_LEN 12
#define SECTOR_HEADER_LEN (SECTOR_ID_LEN+1) // pdd1: lsc+id, pdd2: id+unknown
#define SECTOR_DATA_LEN 1280
//#define OLD_PDD2_HEADER_LEN 4 // for old .pdd2 disk image files
#define SECTOR_LEN (SECTOR_HEADER_LEN+SECTOR_DATA_LEN)
#define PDD1_IMG_LEN (PDD1_TRACKS*PDD1_SECTORS*SECTOR_LEN)
#define PDD2_IMG_LEN (PDD2_TRACKS*PDD2_SECTORS*SECTOR_LEN)
#define SMT_OFFSET 1240
#define PDD1_SMT 0x80
#define PDD2_SMT 0xC0
#define PDD2_MEM_READ_MAX 252 // real drive absolute limit
#define PDD2_MEM_WRITE_MAX 127 // real drive absolute limit
#define TPDD_MSG_MAX 256 // largest theoretical packet is 256+3, largest actual is 252+3
// cpu memory map
#define IOPORT_ADDR 0x00
#define IOPORT_LEN 0x1F
#define CPURAM_ADDR 0x80
#define CPURAM_LEN 0x7F
#define GA_ADDR 0x4000
#define GA_LEN 0x03
#define RAM_ADDR 0x8000
#define RAM_LEN 0x0800
#define ROM_ADDR 0xF000
#define ROM_LEN 0x1000
// sector cache
#define PDD2_ID_REL 0x04
#define PDD2_ID_ADDR (RAM_ADDR+PDD2_ID_REL)
#define PDD2_DATA_REL 0x13
#define PDD2_DATA_ADDR (RAM_ADDR+PDD2_DATA_REL)
#define PDD2_CACHE_LEN (PDD2_DATA_REL+SECTOR_DATA_LEN)
#define PDD2_CACHE_LEN_MSB ((PDD2_CACHE_LEN>>0x08)&0xFF) // 0x05
#define PDD2_CACHE_LEN_LSB (PDD2_CACHE_LEN&0xFF) // 0x13
// TPDD2 version data: 41 10 01 00 50 05 00 02 00 28 00 E1 00 00 00
#define VERSION_MSB 0x41
#define VERSION_LSB 0x10
#define SIDES 0x01
#define TRACKS_MSB ((PDD2_TRACKS>>0x08)&0xFF)
#define TRACKS_LSB (PDD2_TRACKS&0xFF)
#define SECTOR_SIZE_MSB ((SECTOR_DATA_LEN>>0x08)&0xFF)
#define SECTOR_SIZE_LSB (SECTOR_DATA_LEN&0xFF)
#define SECTORS_PER_TRACK 0x02
#define DIRENTS_MSB ((DIRENTS>>0x08)&0xFF)
#define DIRENTS_LSB (DIRENTS&0xFF)
#define MAX_FD 0x00 // it's 0 but it means the highest fd# is 0, meaning max 1 open file
#define MODEL_CODE 0xE1 // E1 = TPDD2
#define VERSION_R0 0x00
#define VERSION_R1 0x00
#define VERSION_R2 0x00
// TPDD2 sysinfo data: 80 13 05 00 10 E1
#define SECTOR_CACHE_START_MSB ((PDD2_DATA_ADDR>>0x08)&0xFF) // 0x80
#define SECTOR_CACHE_START_LSB (PDD2_DATA_ADDR&0xFF) // 0x13
// sysinfo[2] = SECTOR_SIZE_MSB
// sysinfo[3] = SECTOR_SIZE_LSB
#define SYSINFO_CPU_CODE 0x10 // 0x10 = HD6301
// sysinfo[5] = MODEL_CODE
// flags
#define FE_FLAGS_NONE 0
#define FE_FLAGS_DIR 1
#define NO_RET 0
#define ALLOW_RET 1
#define CACHE_LOAD 0
#define CACHE_COMMIT 1
#define CACHE_COMMIT_VERIFY 2
#define MEM_CACHE 0
#define MEM_CPU 1
// KC-85-platform BASIC interpreter EOL & EOF bytes for bootstrap()
#define BASIC_EOL 0x0D
#define BASIC_EOF 0x1A
#define LOCAL_EOL 0x0A
// drive command seperators
#define OPR_CMD_SYNC 0x5A
#define FDC_CMD_EOL 0x0D
// drive operating modes
#define MODE_OPR 1
#define MODE_FDC 0
#ifdef RAW_ATTR
#define ATTR_RAW RAW_ATTR
#else
#define ATTR_RAW 0x20 // space - drive firmware fills unused with 0x20
#endif
#ifdef DEFAULT_ATTR
#define ATTR_DEF DEFAULT_ATTR
#else
#define ATTR_DEF 0x46 // F - almost all clients on all platforms hardcode F
#endif
#endif // PDD_CONSTANTS_H