144 lines
4.4 KiB
C
144 lines
4.4 KiB
C
/* iEPROM1.c: Intel EPROM simulator for 8-bit SBCs
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Copyright (c) 2010, 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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?? ??? 10 - Original file.
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NOTES:
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These functions support a simulated ROM devices on an iSBC-80/XX SBCs.
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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 2708, 2716, 2732, or 2764 type EPROM.
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These functions also support bit 1 of 8255 number 1, port B, to enable/
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disable the onboard ROM.
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*/
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#include "system_defs.h"
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/* function prototypes */
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t_stat EPROM1_cfg(uint16 base, uint16 size);
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t_stat EPROM1_attach (UNIT *uptr, CONST char *cptr);
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t_stat EPROM1_reset (DEVICE *dptr);
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uint8 EPROM1_get_mbyte(uint16 addr);
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/* external function prototypes */
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extern void multibus_put_mbyte(uint16 addr, uint8 val);
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/* external globals */
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extern uint8 xack; /* XACK signal */
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/* globals */
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/* SIMH EPROM Standard I/O Data Structures */
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UNIT EPROM1_unit[] = {
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UDATA (NULL, UNIT_ATTABLE+UNIT_BINK+UNIT_ROABLE+UNIT_RO+UNIT_BUFABLE+UNIT_MUSTBUF, 0), 0
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};
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DEBTAB EPROM1_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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{ "XACK", DEBUG_xack },
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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 EPROM1_dev = {
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"EPROM1", //name
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EPROM1_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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NULL, //reset
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NULL, //boot
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&EPROM1_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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EPROM1_debug, //debflags
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NULL, //msize
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NULL //lname
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};
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/* EPROM functions */
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// EPROM configuration
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t_stat EPROM1_cfg(uint16 base, uint16 size)
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{
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EPROM1_unit->capac = size; /* set EPROM size */
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EPROM1_unit->u3 = base & 0xFFFF; /* set EPROM base */
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sim_printf(" EPROM1: 0%04XH bytes at base 0%04XH\n",
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EPROM1_unit->capac, EPROM1_unit->u3);
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return SCPE_OK;
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}
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/* EPROM reset */
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t_stat EPROM1_reset (DEVICE *dptr)
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{
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return SCPE_OK;
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}
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/* EPROM attach */
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t_stat EPROM1_attach (UNIT *uptr, CONST char *cptr)
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{
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t_stat r;
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if ((r = attach_unit (uptr, cptr)) != SCPE_OK) {
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sim_printf("EPROM1_attach: Error %d\n", r);
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return r;
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}
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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 EPROM1_get_mbyte(uint16 addr)
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{
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uint8 val;
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val = *((uint8 *)EPROM1_unit->filebuf + (addr - EPROM1_unit->u3));
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val &= 0xFF;
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return val;
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}
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/* end of iEPROM1.c */
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