177 lines
6.2 KiB
C
177 lines
6.2 KiB
C
/* pceprom.c: Intel EPROM simulator for 8-bit SBCs
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Copyright (c) 2016, William A. Beech
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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WILLIAM A. BEECH BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of William A. Beech shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from William A. Beech.
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MODIFICATIONS:
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11 Jul 16 - Original file.
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NOTES:
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These functions support a simulated ROM devices on aPC XT SBC.
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This allows the attachment of the device to a binary file containing the EPROM
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code image. Unit will support a single 2764, 27128, 27256, or 27512 type EPROM.
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*/
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#include "system_defs.h"
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/* function prototypes */
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t_stat EPROM_attach (UNIT *uptr, CONST char *cptr);
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t_stat EPROM_reset (DEVICE *dptr, uint32 base, uint32 size);
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uint8 EPROM_get_mbyte(uint32 addr);
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/* external function prototypes */
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/* SIMH EPROM Standard I/O Data Structures */
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UNIT EPROM_unit = {
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UDATA (NULL, UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO, 0), 0
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};
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DEBTAB EPROM_debug[] = {
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{ "ALL", DEBUG_all },
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{ "FLOW", DEBUG_flow },
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{ "READ", DEBUG_read },
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{ "WRITE", DEBUG_write },
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{ "LEV1", DEBUG_level1 },
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{ "LEV2", DEBUG_level2 },
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{ NULL }
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};
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DEVICE EPROM_dev = {
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"EPROM", //name
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&EPROM_unit, //units
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NULL, //registers
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NULL, //modifiers
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1, //numunits
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16, //aradix
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16, //awidth
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1, //aincr
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16, //dradix
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8, //dwidth
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NULL, //examine
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NULL, //deposit
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// &EPROM_reset, //reset
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NULL, //reset
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NULL, //boot
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&EPROM_attach, //attach
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NULL, //detach
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NULL, //ctxt
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DEV_DEBUG, //flags
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0, //dctrl
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EPROM_debug, //debflags
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NULL, //msize
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NULL //lname
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};
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/* global variables */
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/* EPROM functions */
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/* EPROM attach */
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t_stat EPROM_attach (UNIT *uptr, CONST char *cptr)
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{
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uint16 j;
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int c;
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FILE *fp;
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t_stat r;
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sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: cptr=%s\n", cptr);
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if ((r = attach_unit (uptr, cptr)) != SCPE_OK) {
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sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Error\n");
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return r;
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}
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sim_debug (DEBUG_read, &EPROM_dev, "\tAllocate buffer\n");
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if (EPROM_unit.filebuf == NULL) { /* no buffer allocated */
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EPROM_unit.filebuf = malloc(EPROM_unit.capac); /* allocate EPROM buffer */
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if (EPROM_unit.filebuf == NULL) {
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sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Malloc error\n");
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return SCPE_MEM;
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}
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}
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sim_debug (DEBUG_read, &EPROM_dev, "\tOpen file %s\n", EPROM_unit.filename);
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fp = fopen(EPROM_unit.filename, "rb"); /* open EPROM file */
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if (fp == NULL) {
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sim_printf("EPROM: Unable to open ROM file %s\n", EPROM_unit.filename);
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sim_printf("\tNo ROM image loaded!!!\n");
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return SCPE_OK;
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}
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sim_debug (DEBUG_read, &EPROM_dev, "\tRead file\n");
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j = 0; /* load EPROM file */
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c = fgetc(fp);
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while (c != EOF) {
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*((uint8 *)EPROM_unit.filebuf + j++) = c & 0xFF;
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c = fgetc(fp);
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if (j > EPROM_unit.capac) {
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sim_printf("\tImage is too large - Load truncated!!!\n");
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break;
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}
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}
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sim_printf("\tImage size=%05X unit_capac=%05X\n", j, EPROM_unit.capac);
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sim_debug (DEBUG_read, &EPROM_dev, "\tClose file\n");
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fclose(fp);
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sim_printf("EPROM: %d bytes of ROM image %s loaded\n", j, EPROM_unit.filename);
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sim_debug (DEBUG_flow, &EPROM_dev, "EPROM_attach: Done\n");
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return SCPE_OK;
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}
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/* EPROM reset */
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t_stat EPROM_reset (DEVICE *dptr, uint32 base, uint32 size)
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{
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sim_debug (DEBUG_flow, &EPROM_dev, " EPROM_reset: base=%05X size=%05X\n", base, size);
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if ((EPROM_unit.flags & UNIT_ATT) == 0) { /* if unattached */
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EPROM_unit.capac = size; /* set EPROM size */
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EPROM_unit.u3 = base; /* set EPROM base addr */
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sim_debug (DEBUG_flow, &EPROM_dev, "Done1\n");
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sim_printf(" EPROM: Available [%05X-%05XH]\n",
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base, size);
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return SCPE_OK;
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} else
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sim_printf("EPROM: No file attached\n");
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sim_debug (DEBUG_flow, &EPROM_dev, "Done2\n");
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return SCPE_OK;
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}
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/* get a byte from memory */
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uint8 EPROM_get_mbyte(uint32 addr)
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{
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uint8 val;
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uint32 romoff;
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romoff = addr - EPROM_unit.u3;
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sim_debug (DEBUG_read, &EPROM_dev, "EPROM_get_mbyte: addr=%05X romoff=%05X\n", addr, romoff);
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if (romoff < EPROM_unit.capac) {
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val = *((uint8 *)EPROM_unit.filebuf + romoff);
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sim_debug (DEBUG_read, &EPROM_dev, " val=%02X\n", val);
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return (val & 0xFF);
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}
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sim_debug (DEBUG_read, &EPROM_dev, " Out of range\n");
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return 0xFF;
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}
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/* end of pceprom.c */
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