| /* altairz80_mhdsk.c: MITS 88-HDSK Hard Disk simulator | |
| Copyright (c) 2002-2014, Peter Schorn | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| PETER SCHORN BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| Except as contained in this notice, the name of Peter Schorn shall not | |
| be used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Peter Schorn. | |
| ------------------------------------------------------------------------------ | |
| The 88-HDSK from MITS/Pertec consists of a 5mb removable platter and | |
| a fixed 5mb platter. Each platter is double sided. Head 0 and 1 are the | |
| top and bottom surface of the removable platter and head 2 and 3 are the | |
| top and bottom surface of the fixed platter. Hard disk BASIC treats the | |
| two platters as two separate drives. Each platter has 406 cylinders | |
| with 24 sectors per track and 256 bytes per sector. | |
| The disk image file starts with head 0, track 0, sector 0 (0,0,0) through | |
| (0,0,23), followed by head 1, track 0, sector 0 (1,0,0) through (1,0,23). | |
| The pattern then repeats starting with (0,1,0). | |
| The external hard disk is accessed through eight ports of a 4-PIO card | |
| at I/O addresses A0h-A7h. | |
| Written by Mike Douglas March, 2014 | |
| Disk images provided by Martin Eberhard | |
| ------------------------------------------------------------------------------- | |
| */ | |
| #include "altairz80_defs.h" | |
| #include <assert.h> | |
| /** Typedefs & Defines **************************************/ | |
| #define HDSK_SECTOR_SIZE 256 /* size of sector */ | |
| #define HDSK_SECTORS_PER_TRACK 24 /* sectors per track */ | |
| #define HDSK_NUM_HEADS 2 /* heads per disk */ | |
| #define HDSK_NUM_TRACKS 406 /* tracks per surface */ | |
| #define HDSK_TRACK_SIZE (HDSK_SECTOR_SIZE * HDSK_SECTORS_PER_TRACK) | |
| #define HDSK_CYLINDER_SIZE (HDSK_TRACK_SIZE * 2) | |
| #define HDSK_CAPACITY (HDSK_CYLINDER_SIZE * HDSK_NUM_TRACKS) | |
| #define HDSK_NUMBER 8 /* number of hard disks */ | |
| #define IO_IN 0 /* I/O operation is input */ | |
| #define IO_OUT 1 /* I/O operation is output */ | |
| #define UNIT_V_DSK_WLK (UNIT_V_UF + 0) /* write locked */ | |
| #define UNIT_DSK_WLK (1 << UNIT_V_DSK_WLK) | |
| /* Debug flags */ | |
| #define READ_MSG (1 << 0) | |
| #define WRITE_MSG (1 << 1) | |
| #define VERBOSE_MSG (1 << 2) | |
| extern uint32 PCX; | |
| /* boot related */ | |
| #define BOOTROM_SIZE_MHDSK 256 | |
| #define MHDSK_BOOT_ADDRESS 0xfc00 | |
| static t_stat mhdsk_boot(int32 unitno, DEVICE *dptr); | |
| extern t_stat install_bootrom(const int32 bootrom[], const int32 size, const int32 addr, const int32 makeROM); | |
| // Disk controller commands are in upper nibble of command high byte. | |
| #define CMD_SHIFT 4 // shift right 4 places | |
| #define CMD_MASK 0x0f // mask after shifting | |
| #define CMD_SEEK 0 // seek to track | |
| #define CMD_WRITE_SEC 2 // write sector from buf n | |
| #define CMD_READ_SEC 3 // read sector into buf n | |
| #define CMD_WRITE_BUF 4 // load buffer n from CPU | |
| #define CMD_READ_BUF 5 // read buffer n into CPU | |
| #define CMD_READ_STATUS 6 // read controller IV byte | |
| #define CMD_SET_IV_BYTE 8 // set controller IV byte | |
| #define CMD_READ_UNFMT 10 // read unformatted sector | |
| #define CMD_FORMAT 12 | |
| #define CMD_INITIALIZE 14 | |
| #define CMD_MAX (CMD_INITIALIZE + 1) | |
| static char* commandMessage[CMD_MAX] = { | |
| "Seek", // CMD_SEEK 0 | |
| "Undefined 1", // 1 | |
| "Write Sector", // CMD_WRITE_SEC 2 | |
| "Read Sector", // CMD_READ_SEC 3 | |
| "Write Buffer", // CMD_WRITE_BUF 4 | |
| "Read Buffer", // CMD_READ_BUF 5 | |
| "Read Status", // CMD_READ_STATUS 6 | |
| "Undefined 7", // 7 | |
| "Set IV Byte", // CMD_SET_IV_BYTE 8 | |
| "Undefined 9", // 9 | |
| "Read Unformatted Sector", // CMD_READ_UNFMT 10 | |
| "Undefined 11", // 11 | |
| "Format", // CMD_FORMAT 12 | |
| "Undefined 13", // 13 | |
| "Initialize", // CMD_INITIALIZE 14 | |
| }; | |
| // Other disk controller bit fields | |
| #define UNIT_SHIFT 2 // shift right 2 places | |
| #define UNIT_MASK 0x03 // mask after shifting | |
| #define BUFFER_MASK 0x03 // mask - no shift needed | |
| #define TRACK_SHIFTH 8 // shift left 8 places into MSbyte | |
| #define TRACK_MASKH 0x01 // msb of track number | |
| #define TRACK_MASKL 0xff // entire lsb of track number | |
| #define HEAD_SHIFT 5 // shift right 5 places | |
| #define HEAD_MASK 0x03 // mask after shifting (no heads 4-7) | |
| #define SECTOR_MASK 0x1f // mask - no shift needed | |
| // Command status equates | |
| #define CSTAT_WRITE_PROTECT 0x80 // disk is write protected | |
| #define CSTAT_NOT_READY 0x01 // drive not ready | |
| #define CSTAT_BAD_SECTOR 0x02 // invalid sector number | |
| /** Module Globals - Private ********************************/ | |
| static uint32 selectedDisk = 0; // current active disk | |
| static uint32 selectedSector = 0; // current sector | |
| static uint32 selectedTrack = 0; // current track | |
| static uint32 selectedHead = 0; // current head | |
| static uint32 selectedBuffer = 0; // current buffer # in use | |
| static uint32 bufferIdx = 0; // current index into selected buffer | |
| static uint32 maxBufferIdx = 256; // maximum buffer index allowed | |
| static uint32 cmdLowByte = 0; // low byte of command | |
| // Controller status bytes | |
| static uint8 cstat = 0; // command status from controller | |
| // The hard disk controller supports four 256 byte disk buffers */ | |
| static uint8 diskBuf1[HDSK_SECTOR_SIZE]; | |
| static uint8 diskBuf2[HDSK_SECTOR_SIZE]; | |
| static uint8 diskBuf3[HDSK_SECTOR_SIZE]; | |
| static uint8 diskBuf4[HDSK_SECTOR_SIZE]; | |
| static uint8 *diskBuf[] = { diskBuf1, diskBuf2, diskBuf3, diskBuf4 }; | |
| /** Forward and external Prototypes **************************************/ | |
| static int32 hdReturnReady(const int32 port, const int32 io, const int32 data); | |
| static int32 hdCstat(const int32 port, const int32 io, const int32 data); | |
| static int32 hdAcmd(const int32 port, const int32 io, const int32 data); | |
| static int32 hdCdata(const int32 port, const int32 io, const int32 data); | |
| static int32 hdAdata(const int32 port, const int32 io, const int32 data); | |
| static void doRead(const int32 port, const int32 data, const uint32 command); | |
| static void doWrite(const int32 port, const int32 data, const uint32 command); | |
| static t_stat dsk_reset(DEVICE *dptr); | |
| static char* cmdTranslate(const int32 cmd); | |
| extern uint32 sim_map_resource(uint32 baseaddr, uint32 size, uint32 resource_type, | |
| int32 (*routine)(const int32, const int32, const int32), uint8 unmap); | |
| static const char* mhdsk_description(DEVICE *dptr); | |
| /* 88DSK Standard I/O Data Structures */ | |
| static UNIT dsk_unit[] = { | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }, | |
| { UDATA (NULL, UNIT_FIX + UNIT_ATTABLE + UNIT_DISABLE + UNIT_ROABLE, HDSK_CAPACITY) }}; | |
| #define MHDSK_NAME "MITS Hard Disk" | |
| static const char* mhdsk_description(DEVICE *dptr) { | |
| return MHDSK_NAME; | |
| } | |
| static MTAB dsk_mod[] = { | |
| { UNIT_DSK_WLK, 0, "WRTENB", "WRTENB", NULL, NULL, NULL, | |
| "Enables " MHDSK_NAME "n for writing" }, | |
| { UNIT_DSK_WLK, UNIT_DSK_WLK, "WRTLCK", "WRTLCK", NULL, NULL, NULL, | |
| "Locks " MHDSK_NAME "n for writing" }, | |
| { 0 } | |
| }; | |
| /* Debug Flags */ | |
| static DEBTAB mhdsk_dt[] = { | |
| { "READ", READ_MSG, "Read messages" }, | |
| { "WRITE", WRITE_MSG, "Write messages" }, | |
| { "VERBOSE", VERBOSE_MSG, "Verbose messages" }, | |
| { NULL, 0 } | |
| }; | |
| DEVICE mhdsk_dev = { | |
| "MHDSK", dsk_unit, NULL, dsk_mod, | |
| HDSK_NUMBER, 10, 31, 1, 8, 8, | |
| NULL, NULL, &dsk_reset, | |
| &mhdsk_boot, NULL, NULL, | |
| NULL, (DEV_DISABLE | DEV_DEBUG), 0, | |
| mhdsk_dt, NULL, NULL, NULL, NULL, NULL, &mhdsk_description | |
| }; | |
| static int32 bootrom_mhdsk[BOOTROM_SIZE_MHDSK] = { | |
| 0xf3, 0x31, 0x00, 0xf8, 0x21, 0x1b, 0x41, 0x2b, /* fc00-fc07 */ | |
| 0x7c, 0xb5, 0xc2, 0x07, 0xfc, 0xe5, 0xd3, 0xa0, /* fc08-fc0f */ | |
| 0xd3, 0xa2, 0xd3, 0xa4, 0xd3, 0xa6, 0xd3, 0xa1, /* fc10-fc17 */ | |
| 0xd3, 0xa5, 0x2f, 0xd3, 0xa3, 0xd3, 0xa7, 0x3e, /* fc18-fc1f */ | |
| 0x2c, 0xd3, 0xa0, 0xd3, 0xa4, 0xd3, 0xa6, 0x3e, /* fc20-fc27 */ | |
| 0x24, 0xd3, 0xa2, 0xdb, 0xa1, 0x3e, 0x03, 0xd3, /* fc28-fc2f */ | |
| 0x10, 0x3e, 0x11, 0xd3, 0x10, 0xcd, 0xe5, 0xfc, /* fc30-fc37 */ | |
| 0x0d, 0x0a, 0x48, 0x44, 0x42, 0x4c, 0x20, 0x31, /* fc38-fc3f */ | |
| 0x2e, 0x30, 0xb1, 0xcd, 0x77, 0xfc, 0x11, 0x2c, /* fc40-fc47 */ | |
| 0x00, 0x7a, 0xbb, 0xdb, 0xa5, 0xd2, 0x54, 0xfc, /* fc48-fc4f */ | |
| 0x6c, 0x61, 0x48, 0x47, 0x14, 0xc2, 0x49, 0xfc, /* fc50-fc57 */ | |
| 0xcd, 0xe5, 0xfc, 0x0d, 0x0a, 0x4c, 0x4f, 0x41, /* fc58-fc5f */ | |
| 0x44, 0x49, 0x4e, 0xc7, 0xd1, 0xd5, 0xcd, 0x77, /* fc60-fc67 */ | |
| 0xfc, 0xdb, 0xa5, 0x12, 0x13, 0x05, 0xc2, 0x69, /* fc68-fc6f */ | |
| 0xfc, 0x23, 0x0d, 0xc2, 0x66, 0xfc, 0xc9, 0xe5, /* fc70-fc77 */ | |
| 0xd5, 0xc5, 0x01, 0xd0, 0xff, 0x11, 0xff, 0xff, /* fc78-fc7f */ | |
| 0x13, 0x09, 0xda, 0x80, 0xfc, 0x7d, 0xc6, 0x30, /* fc80-fc87 */ | |
| 0xeb, 0xfe, 0x18, 0xda, 0x90, 0xfc, 0xc6, 0x08, /* fc88-fc8f */ | |
| 0x47, 0xcd, 0xaf, 0xfc, 0x26, 0x30, 0xdb, 0xff, /* fc90-fc97 */ | |
| 0xe6, 0x03, 0x0f, 0x0f, 0xb0, 0xcd, 0xb0, 0xfc, /* fc98-fc9f */ | |
| 0xdb, 0xa5, 0xdb, 0xa3, 0xaf, 0xd3, 0xa7, 0x3e, /* fca0-fca7 */ | |
| 0x50, 0xd3, 0xa3, 0xc1, 0xd1, 0xe1, 0xc9, 0x7d, /* fca8-fcaf */ | |
| 0xd3, 0xa7, 0xdb, 0xa1, 0xdb, 0xa3, 0xdb, 0xff, /* fcb0-fcb7 */ | |
| 0xe6, 0x00, 0xb4, 0xd3, 0xa3, 0xdb, 0xa0, 0x07, /* fcb8-fcbf */ | |
| 0xd2, 0xbd, 0xfc, 0xdb, 0xa1, 0xe6, 0x7f, 0xc8, /* fcc0-fcc7 */ | |
| 0xfb, 0xf5, 0xcd, 0xe5, 0xfc, 0x0d, 0x0a, 0x4c, /* fcc8-fccf */ | |
| 0x4f, 0x41, 0x44, 0x20, 0x45, 0x52, 0x52, 0x4f, /* fcd0-fcd7 */ | |
| 0x52, 0xba, 0x21, 0x00, 0xfd, 0x34, 0xca, 0xde, /* fcd8-fcdf */ | |
| 0xfc, 0xe3, 0xc3, 0xcf, 0xfd, 0xe3, 0xdb, 0x10, /* fce0-fce7 */ | |
| 0xe6, 0x02, 0xca, 0xe6, 0xfc, 0x7e, 0xe6, 0x7f, /* fce8-fcef */ | |
| 0xd3, 0x11, 0xbe, 0x23, 0xca, 0xe6, 0xfc, 0xe3, /* fcf0-fcf7 */ | |
| 0xc9, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, /* fcf8-fcff */ | |
| }; | |
| static t_stat mhdsk_boot(int32 unitno, DEVICE *dptr) { | |
| const t_bool installSuccessful = (install_bootrom(bootrom_mhdsk, BOOTROM_SIZE_MHDSK, | |
| MHDSK_BOOT_ADDRESS, FALSE) == SCPE_OK); | |
| assert(installSuccessful); | |
| *((int32 *) sim_PC -> loc) = MHDSK_BOOT_ADDRESS; | |
| return SCPE_OK; | |
| } | |
| static char* cmdTranslate(const int32 cmd) { | |
| static char result[128]; | |
| if ((0 <= cmd) && (cmd < CMD_MAX)) | |
| return commandMessage[cmd]; | |
| sprintf(result, "Undefined %i", cmd); | |
| return result; | |
| } | |
| /*---------------------------------------------------------------------------------- | |
| dsk_reset - install I/O handlers and initialize variables. | |
| ----------------------------------------------------------------------------------*/ | |
| static t_stat dsk_reset(DEVICE *dptr) { | |
| sim_map_resource(0xA0, 1, RESOURCE_TYPE_IO, &hdReturnReady, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA1, 1, RESOURCE_TYPE_IO, &hdCstat, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA2, 1, RESOURCE_TYPE_IO, &hdReturnReady, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA3, 1, RESOURCE_TYPE_IO, &hdAcmd, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA4, 1, RESOURCE_TYPE_IO, &hdReturnReady, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA5, 1, RESOURCE_TYPE_IO, &hdCdata, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA6, 1, RESOURCE_TYPE_IO, &hdReturnReady, dptr->flags & DEV_DIS); | |
| sim_map_resource(0xA7, 1, RESOURCE_TYPE_IO, &hdAdata, dptr->flags & DEV_DIS); | |
| selectedSector = 0; // current sector | |
| selectedTrack = 0; // current track | |
| selectedHead = 0; // current head | |
| selectedBuffer = 0; // current buffer # in use | |
| bufferIdx = 0; // current index into selected buffer | |
| maxBufferIdx = 256; // maximum buffer index allowed | |
| cmdLowByte = 0; // low byte of command | |
| return SCPE_OK; | |
| } | |
| /*------------------------------------------------------------------------------------- | |
| hdReturnReady - common I/O handler for several hard disk status ports which set | |
| bit 7 when the corresponding hard disk function is ready. In the emulator, | |
| we're always ready for the next step, so we simply return ready all the time. | |
| 0xA0 - CREADY register. Accessed through the status/control register of 4-PIO | |
| port 1-A. Returns the "ready for command" status byte. | |
| 0xA2 - ACSTA register. Accessed through the status/control register of 4-PIO | |
| port 1-B. Returns the "command received" status byte. | |
| 0xA4 - CDSTA register. Accessed through the status/control register of 4-PIO | |
| port 2-A. Returns the "command data available" status byte. | |
| 0xA6 - ADSTA register. Accessed through the status/control register of 4-PIO | |
| port 2-B. Returns the "available to write" status byte. | |
| ---------------------------------------------------------------------------------------*/ | |
| static int32 hdReturnReady(const int32 port, const int32 io, const int32 data) | |
| { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " IN(%02X = %s) = 0x80.\n", | |
| PCX, port, (port == 0xa0 ? "CREADY" : (port == 0xa2 ? "ACSTA" : | |
| (port == 0xa4 ? "CDSTA" : (port == 0xa6 ? "ADSTA" : "?????"))))); | |
| return(0x80); // always indicate ready | |
| // output operations have no effect | |
| } | |
| /*------------------------------------------------------------ | |
| hdCstat (0xA1) CSTAT register. Accessed through the | |
| data register of 4-PIO port 1-A. | |
| Comments: Returns error code byte of the most recent | |
| operation. Reading this byte also clears | |
| the CRDY bit, but this isn't actually done | |
| in the emulation since we're always ready. | |
| -------------------------------------------------------------*/ | |
| static int32 hdCstat(const int32 port, const int32 io, const int32 data) | |
| { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " IN(%02X = %s) = %02x.\n", PCX, port, (port == 0xa1 ? "CSTAT" : "?????"), cstat); | |
| return(cstat); | |
| // output operations have no effect | |
| } | |
| /*------------------------------------------------------------ | |
| hdAcmd (0xA3) ACMD register. Accessed through the | |
| data register of 4-PIO port 1-B. | |
| Comments: The high byte of a command is written to | |
| this register and initiates the command. | |
| The low byte of a command is assumed to | |
| have already been written and stored in | |
| cmdLowByte; | |
| -------------------------------------------------------------*/ | |
| static int32 hdAcmd(const int32 port, const int32 io, const int32 data) | |
| { | |
| uint32 command; // command field from command msb | |
| uint32 unit; // unit number from command msb | |
| uint32 buffer; // buffer number from command msb | |
| // if not an OUT command, exit | |
| if (io != IO_OUT) | |
| return(0); | |
| // extract command and possible unit and buffer fields. | |
| cstat = 0; // assume command success | |
| command = (data >> CMD_SHIFT) & CMD_MASK; | |
| unit = (data >> UNIT_SHIFT) & UNIT_MASK; | |
| buffer = data & BUFFER_MASK; | |
| // SEEK command. Updated selectedTrack. | |
| if (command == CMD_SEEK) { | |
| selectedTrack = cmdLowByte + ((data & TRACK_MASKH) << TRACK_SHIFTH); | |
| if (selectedTrack >= HDSK_NUM_TRACKS) | |
| selectedTrack = HDSK_NUM_TRACKS-1; | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. " | |
| "Unit = %i. Buffer = %i. Selected Track = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer, selectedTrack); | |
| } | |
| // READ, READ UNFORMATTED or WRITE SECTOR command. | |
| else if ((command == CMD_WRITE_SEC) || (command == CMD_READ_SEC) || (command == CMD_READ_UNFMT)) { | |
| selectedHead = (cmdLowByte >> HEAD_SHIFT) & HEAD_MASK; | |
| selectedDisk = (selectedHead >> 1) + unit * 2 ; | |
| selectedSector = cmdLowByte & SECTOR_MASK; | |
| selectedBuffer = buffer; | |
| if (mhdsk_dev.units[selectedDisk].fileref == NULL) { // make sure a file is attached | |
| cstat = CSTAT_NOT_READY; | |
| sim_debug(READ_MSG, &mhdsk_dev, "MHDSK%i: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. " | |
| "Track = %i. Sector = %i. Head = %i. Buffer = %i. " | |
| "No file attached.\n", selectedDisk, PCX, port, data, cmdTranslate(command), | |
| selectedTrack, selectedSector, selectedHead, selectedBuffer); | |
| } else if (command == CMD_WRITE_SEC) | |
| doWrite(port, data, command); | |
| else // CMD_READ_SEC or CMD_READ_UNFMT | |
| doRead(port, data, command); | |
| } | |
| // READ or WRITE BUFFER command. Initiates reading/loading specified buffer. | |
| else if ((command == CMD_WRITE_BUF) || (command == CMD_READ_BUF)) { | |
| selectedBuffer = buffer; | |
| maxBufferIdx = cmdLowByte; | |
| if (maxBufferIdx == 0) | |
| maxBufferIdx = 256; | |
| bufferIdx = 0; | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. " | |
| "CMD = %s. Unit = %i. Buffer = %i. Max. Buffer Index = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer, maxBufferIdx); | |
| } | |
| // READ STATUS command (read IV byte) | |
| else if (command == CMD_READ_STATUS) { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. Unit = %i. Buffer = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer); | |
| } | |
| // SET IV byte command | |
| else if (command == CMD_SET_IV_BYTE) { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. Unit = %i. Buffer = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer); | |
| } | |
| // FORMAT command | |
| else if (command == CMD_FORMAT) { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. Unit = %i. Buffer = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer); | |
| } | |
| // INITIALIZE command | |
| else if (command == CMD_INITIALIZE) { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. MD = %s. Unit = %i. Buffer = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer); | |
| } else { | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. Unit = %i. Buffer = %i.\n", | |
| PCX, port, data, cmdTranslate(command), unit, buffer); | |
| } | |
| return(0); | |
| } | |
| /*------------------------------------------------------------ | |
| hdCdata (0xA5) Cdata register. Accessed through the | |
| data register of 4-PIO port 1-B. | |
| Comments: Returns data from the read buffer | |
| -------------------------------------------------------------*/ | |
| static int32 hdCdata(const int32 port, const int32 io, const int32 data) | |
| { | |
| if (io == IO_IN) { | |
| if (bufferIdx < maxBufferIdx) { | |
| const int32 result = diskBuf[selectedBuffer][bufferIdx]; | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " IN(%02X = CDATA) = %02x. Buffer = %i. Index = %i.\n", | |
| PCX, port, result, selectedBuffer, bufferIdx); | |
| bufferIdx++; | |
| return(result); | |
| } | |
| } | |
| return(0); | |
| // output operations have no effect | |
| } | |
| /*------------------------------------------------------------ | |
| hdAdata (0xA7) ADATA register. Accessed through the | |
| data register of 4-PIO port 2-B. | |
| Comments: Accepts data into the current buffer | |
| and is also the low byte of a command. | |
| -------------------------------------------------------------*/ | |
| static int32 hdAdata(const int32 port, const int32 io, const int32 data) | |
| { | |
| if (io == IO_OUT) { | |
| cmdLowByte = data & 0xff; | |
| if (bufferIdx < maxBufferIdx) { | |
| diskBuf[selectedBuffer][bufferIdx] = data; | |
| sim_debug(VERBOSE_MSG, &mhdsk_dev, "MHDSK: " ADDRESS_FORMAT | |
| " OUT(%02X = ADATA) = %02x. Buffer = %i. Index = %i.\n", | |
| PCX, port, data, selectedBuffer, bufferIdx); | |
| bufferIdx++; | |
| } | |
| } | |
| return(0); | |
| } | |
| /*-- doRead ------------------------------------------------- | |
| Performs read from MITS Hard Disk image file | |
| Params: nothing | |
| Uses: selectedTrack, selectedHead, selectedSector | |
| selectedDisk, diskBuf[], mhdsk_dev | |
| Returns: nothing (updates cstat directly) | |
| Comments: | |
| -------------------------------------------------------------*/ | |
| static void doRead(const int32 port, const int32 data, const uint32 command) | |
| { | |
| UNIT *uptr; | |
| uint32 fileOffset; | |
| uptr = mhdsk_dev.units + selectedDisk; | |
| fileOffset = HDSK_CYLINDER_SIZE * selectedTrack + | |
| HDSK_TRACK_SIZE * (selectedHead & 0x01) + | |
| HDSK_SECTOR_SIZE * selectedSector; | |
| if (sim_fseek(uptr->fileref, fileOffset, SEEK_SET)) | |
| cstat = CSTAT_NOT_READY; /* seek error */ | |
| else if (sim_fread(diskBuf[selectedBuffer], 1, HDSK_SECTOR_SIZE, uptr->fileref) != HDSK_SECTOR_SIZE) | |
| cstat = CSTAT_NOT_READY; /* write error */ | |
| sim_debug(READ_MSG, &mhdsk_dev, "MHDSK%i: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. " | |
| "Track = %i. Sector = %i. Head = %i. Buffer = %i. Status = %i(%s).\n", | |
| selectedDisk, PCX, port, data, cmdTranslate(command), | |
| selectedTrack, selectedSector, selectedHead, selectedBuffer, | |
| cstat, (cstat == 0 ? "OK" : (cstat == CSTAT_NOT_READY ? "Not Ready" : "????"))); | |
| } | |
| /*-- doWrite ------------------------------------------------ | |
| Performs write to MITS Hard Disk image file | |
| Params: none | |
| Uses: selectedTrack, selectedHead, selectedSector | |
| selectedDisk, diskBuf[], mhdsk_dev | |
| Returns: nothing (updates cstat directly) | |
| Comments: | |
| -------------------------------------------------------------*/ | |
| static void doWrite(const int32 port, const int32 data, const uint32 command) | |
| { | |
| UNIT *uptr; | |
| uint32 fileOffset; | |
| uptr = mhdsk_dev.units + selectedDisk; | |
| if (((uptr->flags) & UNIT_DSK_WLK) == 0) { /* write enabled */ | |
| fileOffset = HDSK_CYLINDER_SIZE * selectedTrack + | |
| HDSK_TRACK_SIZE * (selectedHead & 0x01) + | |
| HDSK_SECTOR_SIZE * selectedSector; | |
| if (sim_fseek(uptr->fileref, fileOffset, SEEK_SET)) | |
| cstat = CSTAT_NOT_READY; /* seek error */ | |
| else if (sim_fwrite(diskBuf[selectedBuffer], 1, HDSK_SECTOR_SIZE, uptr->fileref) != | |
| HDSK_SECTOR_SIZE) | |
| cstat = CSTAT_NOT_READY; /* write error */ | |
| } | |
| else | |
| cstat = CSTAT_WRITE_PROTECT; | |
| sim_debug(WRITE_MSG, &mhdsk_dev, "MHDSK%i: " ADDRESS_FORMAT | |
| " OUT(%02X = ACMD) = %02x. CMD = %s. " | |
| "Track = %i. Sector = %i. Head = %i. Buffer = %i. Status = %i(%s).\n", | |
| selectedDisk, PCX, port, data, cmdTranslate(command), | |
| selectedTrack, selectedSector, selectedHead, selectedBuffer, | |
| cstat, (cstat == 0 ? "OK" : | |
| (cstat == CSTAT_NOT_READY ? "Not Ready" : | |
| (cstat == CSTAT_WRITE_PROTECT ? "Write Protected" : "????")))); | |
| } |