| /* pceprom.c: Intel EPROM simulator for 8-bit SBCs |
| |
| Copyright (c) 2016, 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: |
| |
| 11 Jul 16 - Original file. |
| |
| NOTES: |
| |
| These functions support a simulated ROM devices on aPC XT SBC. |
| This allows the attachment of the device to a binary file containing the EPROM |
| code image. Unit will support a single 2764, 27128, 27256, or 27512 type EPROM. |
| */ |
| |
| #include "system_defs.h" |
| |
| /* function prototypes */ |
| |
| t_stat EPROM_attach (UNIT *uptr, CONST char *cptr); |
| t_stat EPROM_reset (DEVICE *dptr, uint32 base, uint32 size); |
| uint8 EPROM_get_mbyte(uint32 addr); |
| |
| /* external function prototypes */ |
| |
| /* SIMH EPROM Standard I/O Data Structures */ |
| |
| UNIT EPROM_unit = { |
| UDATA (NULL, UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO, 0), 0 |
| }; |
| |
| DEBTAB EPROM_debug[] = { |
| { "ALL", DEBUG_all }, |
| { "FLOW", DEBUG_flow }, |
| { "READ", DEBUG_read }, |
| { "WRITE", DEBUG_write }, |
| { "LEV1", DEBUG_level1 }, |
| { "LEV2", DEBUG_level2 }, |
| { NULL } |
| }; |
| |
| DEVICE EPROM_dev = { |
| "EPROM", //name |
| &EPROM_unit, //units |
| NULL, //registers |
| NULL, //modifiers |
| 1, //numunits |
| 16, //aradix |
| 16, //awidth |
| 1, //aincr |
| 16, //dradix |
| 8, //dwidth |
| NULL, //examine |
| NULL, //deposit |
| // &EPROM_reset, //reset |
| NULL, //reset |
| NULL, //boot |
| &EPROM_attach, //attach |
| NULL, //detach |
| NULL, //ctxt |
| DEV_DEBUG, //flags |
| 0, //dctrl |
| EPROM_debug, //debflags |
| NULL, //msize |
| NULL //lname |
| }; |
| |
| /* global variables */ |
| |
| /* EPROM functions */ |
| |
| /* EPROM attach */ |
| |
| t_stat EPROM_attach (UNIT *uptr, CONST char *cptr) |
| { |
| uint16 j; |
| int c; |
| FILE *fp; |
| t_stat r; |
| |
| sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: cptr=%s\n", cptr); |
| if ((r = attach_unit (uptr, cptr)) != SCPE_OK) { |
| sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Error\n"); |
| return r; |
| } |
| sim_debug (DEBUG_read, &EPROM_dev, "\tAllocate buffer\n"); |
| if (EPROM_unit.filebuf == NULL) { /* no buffer allocated */ |
| EPROM_unit.filebuf = malloc(EPROM_unit.capac); /* allocate EPROM buffer */ |
| if (EPROM_unit.filebuf == NULL) { |
| sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Malloc error\n"); |
| return SCPE_MEM; |
| } |
| } |
| sim_debug (DEBUG_read, &EPROM_dev, "\tOpen file %s\n", EPROM_unit.filename); |
| fp = fopen(EPROM_unit.filename, "rb"); /* open EPROM file */ |
| if (fp == NULL) { |
| sim_printf("EPROM: Unable to open ROM file %s\n", EPROM_unit.filename); |
| sim_printf("\tNo ROM image loaded!!!\n"); |
| return SCPE_OK; |
| } |
| sim_debug (DEBUG_read, &EPROM_dev, "\tRead file\n"); |
| j = 0; /* load EPROM file */ |
| c = fgetc(fp); |
| while (c != EOF) { |
| *((uint8 *)EPROM_unit.filebuf + j++) = c & 0xFF; |
| c = fgetc(fp); |
| if (j > EPROM_unit.capac) { |
| sim_printf("\tImage is too large - Load truncated!!!\n"); |
| break; |
| } |
| } |
| sim_printf("\tImage size=%05X unit_capac=%05X\n", j, EPROM_unit.capac); |
| sim_debug (DEBUG_read, &EPROM_dev, "\tClose file\n"); |
| fclose(fp); |
| sim_printf("EPROM: %d bytes of ROM image %s loaded\n", j, EPROM_unit.filename); |
| sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Done\n"); |
| return SCPE_OK; |
| } |
| |
| /* EPROM reset */ |
| |
| t_stat EPROM_reset (DEVICE *dptr, uint32 base, uint32 size) |
| { |
| sim_debug (DEBUG_flow, &EPROM_dev, " EPROM_reset: base=%05X size=%05X\n", base, size); |
| if ((EPROM_unit.flags & UNIT_ATT) == 0) { /* if unattached */ |
| EPROM_unit.capac = size; /* set EPROM size */ |
| EPROM_unit.u3 = base; /* set EPROM base addr */ |
| sim_debug (DEBUG_flow, &EPROM_dev, "Done1\n"); |
| sim_printf(" EPROM: Available [%05X-%05XH]\n", |
| base, size); |
| return SCPE_OK; |
| } else |
| sim_printf("EPROM: No file attached\n"); |
| sim_debug (DEBUG_flow, &EPROM_dev, "Done2\n"); |
| return SCPE_OK; |
| } |
| |
| /* get a byte from memory */ |
| |
| uint8 EPROM_get_mbyte(uint32 addr) |
| { |
| uint8 val; |
| uint32 romoff; |
| |
| romoff = addr - EPROM_unit.u3; |
| sim_debug (DEBUG_read, &EPROM_dev, "EPROM_get_mbyte: addr=%05X romoff=%05X\n", addr, romoff); |
| if (romoff < EPROM_unit.capac) { |
| val = *((uint8 *)EPROM_unit.filebuf + romoff); |
| sim_debug (DEBUG_read, &EPROM_dev, " val=%02X\n", val); |
| return (val & 0xFF); |
| } |
| sim_debug (DEBUG_read, &EPROM_dev, " Out of range\n"); |
| return 0xFF; |
| } |
| |
| /* end of pceprom.c */ |