/* iEPROM.c: Intel EPROM simulator for 8-bit SBCs
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:
?? ??? 10 - Original file.
16 Dec 12 - Modified to use isbc_80_10.cfg file to set base and size.
24 Apr 15 -- Modified to use simh_debug
NOTES:
These functions support a simulated i2732 EPROM device on an Intel iSBC 80/XX.
This allows the attachment of the device to a binary file containing the EPROM
code image.
Unit will support a single 2708, 2716, 2732 and 2764 type EPROMs.
*/
#include "system_defs.h"
#define SET_XACK(VAL) (xack = VAL)
/* function prototypes */
t_stat EPROM_attach (UNIT *uptr, char *cptr);
t_stat EPROM_reset (DEVICE *dptr, int32 size);
int32 EPROM_get_mbyte(uint32 addr);
extern UNIT i8255_unit;
extern uint8 xack; /* XACK signal */
/* 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 },
{ "XACK", DEBUG_xack },
{ "LEV1", DEBUG_level1 },
{ "LEV2", DEBUG_level2 },
{ NULL }
};
DEVICE EPROM_dev = {
"EPROM", //name
&EPROM_unit, //units
NULL, //registers
NULL, //modifiers
1, //numunits
16, //aradix
32, //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, 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_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, int32 size)
{
// sim_debug (DEBUG_flow, &EPROM_dev, " EPROM_reset: base=0000 size=%04X\n", size);
if ((EPROM_unit.flags & UNIT_ATT) == 0) { /* if unattached */
EPROM_unit.capac = size; /* set EPROM size to 0 */
sim_debug (DEBUG_flow, &EPROM_dev, "Done1\n");
// sim_printf(" EPROM: Available [%04X-%04XH]\n",
// 0, EPROM_unit.capac - 1);
return SCPE_OK;
}
if ((EPROM_unit.flags & UNIT_ATT) == 0) {
sim_printf("EPROM: No file attached\n");
}
sim_debug (DEBUG_flow, &EPROM_dev, "Done2\n");
return SCPE_OK;
}
/* get a byte from memory */
int32 EPROM_get_mbyte(uint32 addr)
{
int32 val;
if (i8255_unit.u5 & 0x01) { /* EPROM enabled */
sim_debug (DEBUG_read, &EPROM_dev, "EPROM_get_mbyte: addr=%04X\n", addr);
if (addr < EPROM_unit.capac) {
SET_XACK(1); /* good memory address */
sim_debug (DEBUG_xack, &EPROM_dev, "EPROM_get_mbyte: Set XACK for %04X\n", addr);
val = *((uint8 *)EPROM_unit.filebuf + addr);
sim_debug (DEBUG_read, &EPROM_dev, " val=%04X\n", val);
return (val & 0xFF);
}
sim_debug (DEBUG_read, &EPROM_dev, " Out of range\n");
return 0xFF;
}
sim_debug (DEBUG_read, &EPROM_dev, " EPROM Disabled\n");
return 0xFF;
}
/* end of iEPROM.c */