| /* isbc202.c: Intel double density disk adapter adapter | |
| Copyright (c) 2010, William A. Beech | |
| 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 | |
| WILLIAM A. BEECH 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 William A. Beech shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from William A. Beech. | |
| MODIFICATIONS: | |
| 27 Jun 16 - Original file. | |
| NOTES: | |
| This controller will mount 4 DD disk images on drives :F0: thru :F3: addressed | |
| at ports 078H to 07FH. | |
| Registers: | |
| 078H - Read - Subsystem status | |
| bit 0 - ready status of drive 0 | |
| bit 1 - ready status of drive 1 | |
| bit 2 - state of channel's interrupt FF | |
| bit 3 - controller presence indicator | |
| bit 4 - DD controller presence indicator | |
| bit 5 - ready status of drive 2 | |
| bit 6 - ready status of drive 3 | |
| bit 7 - zero | |
| 079H - Read - Read result type (bits 2-7 are zero) | |
| 00 - I/O complete with error | |
| 01 - Reserved | |
| 10 - Result byte contains diskette ready status | |
| 11 - Reserved | |
| 079H - Write - IOPB address low byte. | |
| 07AH - Write - IOPB address high byte and start operation. | |
| 07BH - Read - Read result byte | |
| If result type is 00H | |
| bit 0 - deleted record | |
| bit 1 - CRC error | |
| bit 2 - seek error | |
| bit 3 - address error | |
| bit 4 - data overrun/underrun | |
| bit 5 - write protect | |
| bit 6 - write error | |
| bit 7 - not ready | |
| If result type is 02H and ready has changed | |
| bit 0 - zero | |
| bit 1 - zero | |
| bit 2 - zero | |
| bit 3 - zero | |
| bit 4 - drive 2 ready | |
| bit 5 - drive 3 ready | |
| bit 6 - drive 0 ready | |
| bit 7 - drive 1 ready | |
| else return 0 | |
| 07FH - Write - Reset diskette system. | |
| Operations: | |
| NOP - 0x00 | |
| Seek - 0x01 | |
| Format Track - 0x02 | |
| Recalibrate - 0x03 | |
| Read Data - 0x04 | |
| Verify CRC - 0x05 | |
| Write Data - 0x06 | |
| Write Deleted Data - 0x07 | |
| IOPB - I/O Parameter Block | |
| Byte 0 - Channel Word | |
| bit 3 - data word length (=8-bit, 1=16-bit) | |
| bit 4-5 - interrupt control | |
| 00 - I/O complete interrupt to be issued | |
| 01 - I/O complete interrupts are disabled | |
| 10 - illegal code | |
| 11 - illegal code | |
| bit 6- randon format sequence | |
| Byte 1 - Diskette Instruction | |
| bit 0-2 - operation code | |
| 000 - no operation | |
| 001 - seek | |
| 010 - format track | |
| 011 - recalibrate | |
| 100 - read data | |
| 101 - verify CRC | |
| 110 - write data | |
| 111 - write deleted data | |
| bit 3 - data word length ( same as byte-0, bit-3) | |
| bit 4-5 - unit select | |
| 00 - drive 0 | |
| 01 - drive 1 | |
| 10 - drive 2 | |
| 11 - drive 3 | |
| bit 6-7 - reserved (zero) | |
| Byte 2 - Number of Records | |
| Byte 4 - Track Address | |
| Byte 5 - Sector Address | |
| Byte 6 - Buffer Low Address | |
| Byte 7 - Buffer High Address | |
| u3 - | |
| u4 - | |
| u5 - fdc number (board instance number). | |
| u6 - fdd number. | |
| */ | |
| #include "system_defs.h" /* system header in system dir */ | |
| #define DEBUG 0 | |
| #define UNIT_V_WPMODE (UNIT_V_UF) /* Write protect */ | |
| #define UNIT_WPMODE (1 << UNIT_V_WPMODE) | |
| #define FDD_NUM 4 | |
| //disk controoler operations | |
| #define DNOP 0x00 //disk no operation | |
| #define DSEEK 0x01 //disk seek | |
| #define DFMT 0x02 //disk format | |
| #define DHOME 0x03 //disk home | |
| #define DREAD 0x04 //disk read | |
| #define DVCRC 0x05 //disk verify CRC | |
| #define DWRITE 0x06 //disk write | |
| //status | |
| #define RDY0 0x01 //FDD 0 ready | |
| #define RDY1 0x02 //FDD 1 ready | |
| #define FDCINT 0x04 //FDC interrupt flag | |
| #define FDCPRE 0x08 //FDC board present | |
| #define FDCDD 0x10 //fdc is DD | |
| #define RDY2 0x20 //FDD 2 ready | |
| #define RDY3 0x40 //FDD 3 ready | |
| //result type | |
| #define RERR 0x00 //FDC returned error | |
| #define ROK 0x02 //FDC returned ok | |
| // If result type is RERR then rbyte is | |
| #define RB0DR 0x01 //deleted record | |
| #define RB0CRC 0x02 //CRC error | |
| #define RB0SEK 0x04 //seek error | |
| #define RB0ADR 0x08 //address error | |
| #define RB0OU 0x10 //data overrun/underrun | |
| #define RB0WP 0x20 //write protect | |
| #define RB0WE 0x40 //write error | |
| #define RB0NR 0x80 //not ready | |
| // If result type is ROK then rbyte is | |
| #define RB1RD2 0x10 //drive 2 ready | |
| #define RB1RD3 0x20 //drive 3 ready | |
| #define RB1RD0 0x40 //drive 0 ready | |
| #define RB1RD1 0x80 //drive 1 ready | |
| //disk geometry values | |
| #define MDSSD 256256 //single density FDD size | |
| #define MDSDD 512512 //double density FDD size | |
| #define MAXSECSD 26 //single density last sector | |
| #define MAXSECDD 52 //double density last sector | |
| #define MAXTRK 76 //last track | |
| /* external globals */ | |
| extern uint16 port; //port called in dev_table[port] | |
| extern int32 PCX; | |
| /* external function prototypes */ | |
| extern uint16 reg_dev(uint8 (*routine)(t_bool, uint8), uint16, uint8); | |
| extern uint8 multibus_get_mbyte(uint16 addr); | |
| extern uint16 multibus_get_mword(uint16 addr); | |
| extern void multibus_put_mbyte(uint16 addr, uint8 val); | |
| extern uint8 multibus_put_mword(uint16 addr, uint16 val); | |
| /* function prototypes */ | |
| t_stat isbc202_reset(DEVICE *dptr, uint16 base); | |
| void isbc202_reset1(uint8 fdcnum); | |
| t_stat isbc202_attach (UNIT *uptr, CONST char *cptr); | |
| t_stat isbc202_set_mode (UNIT *uptr, int32 val, CONST char *cptr, void *desc); | |
| uint8 isbc202_get_dn(void); | |
| uint8 isbc2020(t_bool io, uint8 data); /* isbc202 0 */ | |
| uint8 isbc2021(t_bool io, uint8 data); /* isbc202 1 */ | |
| uint8 isbc2022(t_bool io, uint8 data); /* isbc202 2 */ | |
| uint8 isbc2023(t_bool io, uint8 data); /* isbc202 3 */ | |
| uint8 isbc2027(t_bool io, uint8 data); /* isbc202 7 */ | |
| void isbc202_diskio(uint8 fdcnum); //do actual disk i/o | |
| /* globals */ | |
| int32 isbc202_fdcnum = 0; //actual number of SBC-202 instances + 1 | |
| typedef struct { //FDD definition | |
| int t0; | |
| int rdy; | |
| uint8 sec; | |
| uint8 cyl; | |
| } FDDDEF; | |
| typedef struct { //FDC definition | |
| uint16 baseport; //FDC base port | |
| uint16 iopb; //FDC IOPB | |
| uint8 stat; //FDC status | |
| uint8 rdychg; //FDC ready change | |
| uint8 rtype; //FDC result type | |
| uint8 rbyte0; //FDC result byte for type 00 | |
| uint8 rbyte1; //FDC result byte for type 10 | |
| uint8 intff; //fdc interrupt FF | |
| FDDDEF fdd[FDD_NUM]; //indexed by the FDD number | |
| } FDCDEF; | |
| FDCDEF fdc202[4]; //indexed by the isbc-202 instance number | |
| UNIT isbc202_unit[] = { | |
| { UDATA (0, UNIT_ATTABLE+UNIT_DISABLE+UNIT_BUFABLE+UNIT_MUSTBUF, MDSDD), 20 }, | |
| { UDATA (0, UNIT_ATTABLE+UNIT_DISABLE+UNIT_BUFABLE+UNIT_MUSTBUF, MDSDD), 20 }, | |
| { UDATA (0, UNIT_ATTABLE+UNIT_DISABLE+UNIT_BUFABLE+UNIT_MUSTBUF, MDSDD), 20 }, | |
| { UDATA (0, UNIT_ATTABLE+UNIT_DISABLE+UNIT_BUFABLE+UNIT_MUSTBUF, MDSDD), 20 } | |
| }; | |
| REG isbc202_reg[] = { | |
| { HRDATA (STAT0, fdc202[0].stat, 8) }, /* isbc202 0 status */ | |
| { HRDATA (RTYP0, fdc202[0].rtype, 8) }, /* isbc202 0 result type */ | |
| { HRDATA (RBYT0A, fdc202[0].rbyte0, 8) }, /* isbc202 0 result byte 0 */ | |
| { HRDATA (RBYT0B, fdc202[0].rbyte1, 8) }, /* isbc202 0 result byte 1 */ | |
| { HRDATA (INTFF0, fdc202[0].intff, 8) }, /* isbc202 0 interrupt f/f */ | |
| { HRDATA (STAT1, fdc202[1].stat, 8) }, /* isbc202 1 status */ | |
| { HRDATA (RTYP1, fdc202[1].rtype, 8) }, /* isbc202 1 result type */ | |
| { HRDATA (RBYT1A, fdc202[1].rbyte0, 8) }, /* isbc202 1 result byte 0 */ | |
| { HRDATA (RBYT1B, fdc202[1].rbyte1, 8) }, /* isbc202 1 result byte 1 */ | |
| { HRDATA (INTFF1, fdc202[1].intff, 8) }, /* isbc202 1 interrupt f/f */ | |
| { HRDATA (STAT2, fdc202[2].stat, 8) }, /* isbc202 2 status */ | |
| { HRDATA (RTYP2, fdc202[2].rtype, 8) }, /* isbc202 2 result type */ | |
| { HRDATA (RBYT2A, fdc202[2].rbyte0, 8) }, /* isbc202 2 result byte 0 */ | |
| { HRDATA (RBYT2B, fdc202[2].rbyte1, 8) }, /* isbc202 2 result byte 1 */ | |
| { HRDATA (INTFF2, fdc202[2].intff, 8) }, /* isbc202 2 interrupt f/f */ | |
| { HRDATA (STAT3, fdc202[3].stat, 8) }, /* isbc202 3 status */ | |
| { HRDATA (RTYP3, fdc202[3].rtype, 8) }, /* isbc202 3 result type */ | |
| { HRDATA (RBYT3A, fdc202[3].rbyte0, 8) }, /* isbc202 3 result byte 0 */ | |
| { HRDATA (RBYT3B, fdc202[3].rbyte1, 8) }, /* isbc202 3 result byte 1 */ | |
| { HRDATA (INTFF3, fdc202[3].intff, 8) }, /* isbc202 3 interrupt f/f */ | |
| { NULL } | |
| }; | |
| MTAB isbc202_mod[] = { | |
| { UNIT_WPMODE, 0, "RW", "RW", &isbc202_set_mode }, | |
| { UNIT_WPMODE, UNIT_WPMODE, "WP", "WP", &isbc202_set_mode }, | |
| { 0 } | |
| }; | |
| DEBTAB isbc202_debug[] = { | |
| { "ALL", DEBUG_all }, | |
| { "FLOW", DEBUG_flow }, | |
| { "READ", DEBUG_read }, | |
| { "WRITE", DEBUG_write }, | |
| { "XACK", DEBUG_xack }, | |
| { "LEV1", DEBUG_level1 }, | |
| { "LEV2", DEBUG_level2 }, | |
| { NULL } | |
| }; | |
| /* address width is set to 16 bits to use devices in 8086/8088 implementations */ | |
| DEVICE isbc202_dev = { | |
| "SBC202", //name | |
| isbc202_unit, //units | |
| isbc202_reg, //registers | |
| isbc202_mod, //modifiers | |
| FDD_NUM, //numunits | |
| 16, //aradix | |
| 16, //awidth | |
| 1, //aincr | |
| 16, //dradix | |
| 8, //dwidth | |
| NULL, //examine | |
| NULL, //deposit | |
| NULL, //reset | |
| NULL, //boot | |
| &isbc202_attach, //attach | |
| NULL, //detach | |
| NULL, //ctxt | |
| DEV_DEBUG+DEV_DISABLE+DEV_DIS, //flags | |
| DEBUG_flow + DEBUG_read + DEBUG_write, //dctrl | |
| isbc202_debug, //debflags | |
| NULL, //msize | |
| NULL //lname | |
| }; | |
| /* Hardware reset routine */ | |
| t_stat isbc202_reset(DEVICE *dptr, uint16 base) | |
| { | |
| int32 i; | |
| UNIT *uptr; | |
| sim_printf(" iSBC-202 FDC Board"); | |
| if (SBC202_NUM) { | |
| sim_printf(" - Found\n"); | |
| sim_printf(" isbc202-%d: Hardware Reset\n", isbc202_fdcnum); | |
| sim_printf(" isbc202-%d: Registered at %04X\n", isbc202_fdcnum, base); | |
| //register base port address for this FDC instance | |
| fdc202[isbc202_fdcnum].baseport = base; | |
| //register I/O port addresses for each function | |
| reg_dev(isbc2020, base, isbc202_fdcnum); //read status | |
| reg_dev(isbc2021, base + 1, isbc202_fdcnum); //read rslt type/write IOPB addr-l | |
| reg_dev(isbc2022, base + 2, isbc202_fdcnum); //write IOPB addr-h and start | |
| reg_dev(isbc2023, base + 3, isbc202_fdcnum); //read rstl byte | |
| reg_dev(isbc2027, base + 7, isbc202_fdcnum); //write reset isbc202 | |
| // one-time initialization for all FDDs for this FDC instance | |
| for (i = 0; i < FDD_NUM; i++) { | |
| uptr = isbc202_dev.units + i; | |
| uptr->u5 = isbc202_fdcnum; //fdc device number | |
| uptr->u6 = i; //fdd unit number | |
| uptr->flags |= UNIT_WPMODE; //set WP in unit flags | |
| } | |
| isbc202_reset1(isbc202_fdcnum); //software reset | |
| isbc202_reset1(isbc202_fdcnum); | |
| isbc202_fdcnum++; | |
| } else | |
| sim_printf(" - Not Found\n"); | |
| return SCPE_OK; | |
| } | |
| /* Software reset routine */ | |
| void isbc202_reset1(uint8 fdcnum) | |
| { | |
| int32 i; | |
| UNIT *uptr; | |
| sim_printf(" isbc202-%d: Software Reset\n", fdcnum); | |
| fdc202[fdcnum].stat = 0; //clear status | |
| for (i = 0; i < FDD_NUM; i++) { /* handle all units */ | |
| uptr = isbc202_dev.units + i; | |
| fdc202[fdcnum].stat |= FDCPRE | FDCDD; //set the FDC status | |
| fdc202[fdcnum].rtype = ROK; | |
| if (uptr->capac == 0) { /* if not configured */ | |
| sim_printf(" SBC202%d: Configured, Status=%02X Not attached\n", i, fdc202[fdcnum].stat); | |
| } else { | |
| switch(i){ | |
| case 0: | |
| fdc202[fdcnum].stat |= RDY0; //set FDD 0 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD0; | |
| break; | |
| case 1: | |
| fdc202[fdcnum].stat |= RDY1; //set FDD 1 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD1; | |
| break; | |
| case 2: | |
| fdc202[fdcnum].stat |= RDY2; //set FDD 2 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD2; | |
| break; | |
| case 3: | |
| fdc202[fdcnum].stat |= RDY3; //set FDD 3 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD3; | |
| break; | |
| } | |
| fdc202[fdcnum].rdychg = 0; | |
| sim_printf(" SBC202%d: Configured, Status=%02X Attached to %s\n", | |
| i, fdc202[fdcnum].stat, uptr->filename); | |
| } | |
| } | |
| } | |
| /* isbc202 attach - attach an .IMG file to a FDD */ | |
| t_stat isbc202_attach (UNIT *uptr, CONST char *cptr) | |
| { | |
| t_stat r; | |
| uint8 fdcnum, fddnum; | |
| sim_debug (DEBUG_flow, &isbc202_dev, " isbc202_attach: Entered with cptr=%s\n", cptr); | |
| // sim_printf(" isbc202_attach: Entered with cptr=%s\n", cptr); | |
| if ((r = attach_unit (uptr, cptr)) != SCPE_OK) { | |
| sim_printf(" isbc202_attach: Attach error\n"); | |
| return r; | |
| } | |
| fdcnum = uptr->u5; | |
| fddnum = uptr->u6; | |
| switch(fddnum){ | |
| case 0: | |
| fdc202[fdcnum].stat |= RDY0; //set FDD 0 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD0; | |
| break; | |
| case 1: | |
| fdc202[fdcnum].stat |= RDY1; //set FDD 1 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD1; | |
| break; | |
| case 2: | |
| fdc202[fdcnum].stat |= RDY2; //set FDD 2 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD2; | |
| break; | |
| case 3: | |
| fdc202[fdcnum].stat |= RDY3; //set FDD 3 ready | |
| fdc202[fdcnum].rbyte1 |= RB1RD3; | |
| break; | |
| } | |
| fdc202[fdcnum].rtype = ROK; | |
| sim_printf(" iSBC-202%d: FDD %d Configured %d bytes, Attached to %s\n", | |
| fdcnum, fddnum, uptr->capac, uptr->filename); | |
| sim_debug (DEBUG_flow, &isbc202_dev, " isbc202_attach: Done\n"); | |
| return SCPE_OK; | |
| } | |
| /* isbc202 set mode = Write protect */ | |
| t_stat isbc202_set_mode (UNIT *uptr, int32 val, CONST char *cptr, void *desc) | |
| { | |
| // sim_debug (DEBUG_flow, &isbc202_dev, " isbc202_set_mode: Entered with val=%08XH uptr->flags=%08X\n", | |
| // val, uptr->flags); | |
| if (val & UNIT_WPMODE) { /* write protect */ | |
| uptr->flags |= val; | |
| } else { /* read write */ | |
| uptr->flags &= ~val; | |
| } | |
| // sim_debug (DEBUG_flow, &isbc202_dev, " isbc202_set_mode: Done\n"); | |
| return SCPE_OK; | |
| } | |
| uint8 isbc202_get_dn(void) | |
| { | |
| int i; | |
| for (i=0; i<SBC202_NUM; i++) | |
| if (port >= fdc202[i].baseport && port <= fdc202[i].baseport + 7) | |
| return i; | |
| sim_printf("isbc202_get_dn: port %04X not in isbc202 device table\n", port); | |
| return 0xFF; | |
| } | |
| /* iSBC202 control port functions */ | |
| uint8 isbc2020(t_bool io, uint8 data) | |
| { | |
| uint8 fdcnum; | |
| if ((fdcnum = isbc202_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read ststus*/ | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x78 returned status=%02X PCX=%04X", | |
| fdcnum, fdc202[fdcnum].stat, PCX); | |
| return fdc202[fdcnum].stat; | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 isbc2021(t_bool io, uint8 data) | |
| { | |
| uint8 fdcnum; | |
| if ((fdcnum = isbc202_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| fdc202[fdcnum].intff = 0; //clear interrupt FF | |
| fdc202[fdcnum].stat &= ~FDCINT; | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x79 returned rtype=%02X intff=%02X status=%02X PCX=%04X", | |
| fdcnum, fdc202[fdcnum].rtype, fdc202[fdcnum].intff, fdc202[fdcnum].stat, PCX); | |
| return fdc202[fdcnum].rtype; | |
| } else { /* write data port */ | |
| fdc202[fdcnum].iopb = data; | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x79 IOPB low=%02X PCX=%04X", | |
| fdcnum, data, PCX); | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 isbc2022(t_bool io, uint8 data) | |
| { | |
| uint8 fdcnum; | |
| if ((fdcnum = isbc202_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| ; | |
| } else { /* write data port */ | |
| fdc202[fdcnum].iopb |= (data << 8); | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x7A IOPB=%04X PCX=%04X", | |
| fdcnum, fdc202[fdcnum].iopb, PCX); | |
| isbc202_diskio(fdcnum); | |
| if (fdc202[fdcnum].intff) | |
| fdc202[fdcnum].stat |= FDCINT; | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 isbc2023(t_bool io, uint8 data) | |
| { | |
| uint8 fdcnum; | |
| if ((fdcnum = isbc202_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| if (fdc202[fdcnum].rtype == 0) { | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x7B returned rbyte0=%02X PCX=%04X", | |
| fdcnum, fdc202[fdcnum].rbyte0, PCX); | |
| return fdc202[fdcnum].rbyte0; | |
| } else { | |
| if (fdc202[fdcnum].rdychg) { | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x7B returned rbyte1=%02X PCX=%04X", | |
| fdcnum, fdc202[fdcnum].rbyte1, PCX); | |
| return fdc202[fdcnum].rbyte1; | |
| } else { | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: 0x7B returned rbytex=%02X PCX=%04X", | |
| fdcnum, 0, PCX); | |
| return 0; | |
| } | |
| } | |
| } else { /* write data port */ | |
| ; //stop diskette operation | |
| } | |
| } | |
| return 0; | |
| } | |
| uint8 isbc2027(t_bool io, uint8 data) | |
| { | |
| uint8 fdcnum; | |
| if ((fdcnum = isbc202_get_dn()) != 0xFF) { | |
| if (io == 0) { /* read data port */ | |
| ; | |
| } else { /* write data port */ | |
| isbc202_reset1(fdcnum); | |
| } | |
| } | |
| return 0; | |
| } | |
| // perform the actual disk I/O operation | |
| void isbc202_diskio(uint8 fdcnum) | |
| { | |
| uint8 cw, di, nr, ta, sa, data, nrptr; | |
| uint16 ba; | |
| uint32 dskoff; | |
| uint8 fddnum, fmtb; | |
| uint32 i; | |
| UNIT *uptr; | |
| uint8 *fbuf; | |
| //parse the IOPB | |
| cw = multibus_get_mbyte(fdc202[fdcnum].iopb); | |
| di = multibus_get_mbyte(fdc202[fdcnum].iopb + 1); | |
| nr = multibus_get_mbyte(fdc202[fdcnum].iopb + 2); | |
| ta = multibus_get_mbyte(fdc202[fdcnum].iopb + 3); | |
| sa = multibus_get_mbyte(fdc202[fdcnum].iopb + 4); | |
| ba = multibus_get_mword(fdc202[fdcnum].iopb + 5); | |
| fddnum = (di & 0x30) >> 4; | |
| uptr = isbc202_dev.units + fddnum; | |
| fbuf = (uint8 *) (isbc202_dev.units + fddnum)->filebuf; | |
| if (DEBUG) { | |
| sim_printf("\n isbc202-%d: isbc202_diskio IOPB=%04X FDD=%02X STAT=%02X", | |
| fdcnum, fdc202[fdcnum].iopb, fddnum, fdc202[fdcnum].stat); | |
| sim_printf("\n isbc202-%d: cw=%02X di=%02X nr=%02X ta=%02X sa=%02X ba=%04X", | |
| fdcnum, cw, di, nr, ta, sa, ba); | |
| } | |
| //check for not ready | |
| switch(fddnum) { | |
| case 0: | |
| if ((fdc202[fdcnum].stat & RDY0) == 0) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0NR; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Ready error on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| break; | |
| case 1: | |
| if ((fdc202[fdcnum].stat & RDY1) == 0) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0NR; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Ready error on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| break; | |
| case 2: | |
| if ((fdc202[fdcnum].stat & RDY2) == 0) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0NR; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Ready error on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| break; | |
| case 3: | |
| if ((fdc202[fdcnum].stat & RDY3) == 0) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0NR; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Ready error on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| break; | |
| } | |
| //check for address error | |
| if ( | |
| ((di & 0x07) != DHOME) && ( | |
| (sa > MAXSECDD) || | |
| ((sa + nr) > (MAXSECDD + 1)) || | |
| (sa == 0) || | |
| (ta > MAXTRK) | |
| )) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0ADR; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Address error on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| switch (di & 0x07) { | |
| case DNOP: | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DSEEK: | |
| fdc202[fdcnum].fdd[fddnum].sec = sa; | |
| fdc202[fdcnum].fdd[fddnum].cyl = ta; | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DHOME: | |
| fdc202[fdcnum].fdd[fddnum].sec = sa; | |
| fdc202[fdcnum].fdd[fddnum].cyl = 0; | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DVCRC: | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DFMT: | |
| //check for WP | |
| if(uptr->flags & UNIT_WPMODE) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0WP; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Write protect error 1 on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| fmtb = multibus_get_mbyte(ba); //get the format byte | |
| //calculate offset into disk image | |
| dskoff = ((ta * MAXSECDD) + (sa - 1)) * 128; | |
| for(i=0; i<=((uint32)(MAXSECDD) * 128); i++) { | |
| *(fbuf + (dskoff + i)) = fmtb; | |
| } | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DREAD: | |
| nrptr = 0; | |
| while(nrptr < nr) { | |
| //calculate offset into disk image | |
| dskoff = ((ta * MAXSECDD) + (sa - 1)) * 128; | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: cw=%02X di=%02X nr=%02X ta=%02X sa=%02X ba=%04X dskoff=%06X", | |
| fdcnum, cw, di, nr, ta, sa, ba, dskoff); | |
| //copy sector from image to RAM | |
| for (i=0; i<128; i++) { | |
| data = *(fbuf + (dskoff + i)); | |
| multibus_put_mbyte(ba + i, data); | |
| } | |
| sa++; | |
| ba+=0x80; | |
| nrptr++; | |
| } | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| case DWRITE: | |
| //check for WP | |
| if(uptr->flags & UNIT_WPMODE) { | |
| fdc202[fdcnum].rtype = RERR; | |
| fdc202[fdcnum].rbyte0 = RB0WP; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| sim_printf("\n isbc202-%d: Write protect error 2 on drive %d", fdcnum, fddnum); | |
| return; | |
| } | |
| nrptr = 0; | |
| while(nrptr < nr) { | |
| //calculate offset into disk image | |
| dskoff = ((ta * MAXSECDD) + (sa - 1)) * 128; | |
| if (DEBUG) | |
| sim_printf("\n isbc202-%d: cw=%02X di=%02X nr=%02X ta=%02X sa=%02X ba=%04X dskoff=%06X", | |
| fdcnum, cw, di, nr, ta, sa, ba, dskoff); | |
| for (i=0; i<128; i++) { //copy sector from image to RAM | |
| data = multibus_get_mbyte(ba + i); | |
| *(fbuf + (dskoff + i)) = data; | |
| } | |
| sa++; | |
| ba+=0x80; | |
| nrptr++; | |
| } | |
| fdc202[fdcnum].rtype = ROK; | |
| fdc202[fdcnum].intff = 1; //set interrupt FF | |
| break; | |
| default: | |
| sim_printf("\n isbc202-%d: isbc202_diskio bad di=%02X", fdcnum, di & 0x07); | |
| break; | |
| } | |
| } | |
| /* end of isbc202.c */ |