177 lines
5.5 KiB
C
177 lines
5.5 KiB
C
/* isbc464.c: Intel iSBC 464 32K Byte ROM Card
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Copyright (c) 2011, 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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29 Oct 17 - Original file.
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NOTES:
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*/
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#include "system_defs.h"
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/* prototypes */
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t_stat isbc064_cfg(uint16 base, uint16 size);
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t_stat isbc464_reset (DEVICE *dptr);
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t_stat isbc464_attach (UNIT *uptr, CONST char *cptr);
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uint8 isbc464_get_mbyte(uint16 addr);
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void isbc464_put_mbyte(uint16 addr, uint8 val);
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/* external function prototypes */
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/* external globals */
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extern uint8 xack; /* XACK signal */
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/* local globals */
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/* isbc464 Standard I/O Data Structures */
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UNIT isbc464_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 isbc464_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 isbc464_dev = {
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"SBC464", //name
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&isbc464_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, //deposite
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NULL, //reset
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NULL, //boot
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isbc464_attach, //attach
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NULL, //detach
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NULL, //ctxt
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DEV_DEBUG+DEV_DISABLE+DEV_DIS, //flags
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0, //dctrl
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isbc464_debug, //debflags
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NULL, //msize
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NULL //lname
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};
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/* isbc464 globals */
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// configuration routine
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t_stat isbc464_cfg(uint16 base, uint16 size)
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{
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sim_printf(" sbc464: 0%04XH bytes at base 0%04XH\n",
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size, base);
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isbc464_unit.capac = size; //set size
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isbc464_unit.u3 = base; //and base
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return SCPE_OK;
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}
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/* Reset routine */
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t_stat isbc464_reset (DEVICE *dptr)
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{
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return SCPE_OK;
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}
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/* isbc464 attach */
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t_stat isbc464_attach (UNIT *uptr, CONST char *cptr)
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{
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t_stat r;
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isbc464_reset(NULL); //odd fix, but it works
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if ((r = attach_unit (uptr, cptr)) != SCPE_OK) {
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sim_printf ("isbc464_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 isbc464_get_mbyte(uint16 addr)
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{
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uint32 val, org, len;
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uint8 *fbuf;
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if ((isbc464_dev.flags & DEV_DIS) == 0) {
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org = isbc464_unit.u3;
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len = isbc464_unit.capac;
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fbuf = (uint8 *) isbc464_unit.filebuf;
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if ((addr >= org) && (addr < (org + len))) {
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SET_XACK(1); /* good memory address */
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val = *(fbuf + (addr - org));
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return (val & 0xFF);
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} else {
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sim_printf("isbc464_get_mbyte: Out of range\n");
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SET_XACK(0); /* bad memory address */
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return 0; /* multibus has active high pullups and inversion */
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}
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}
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sim_printf ("isbc464_put_mbyte: Write-Disabled addr=%04X\n", addr);
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SET_XACK(0); /* bad memory address */
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return 0; /* multibus has active high pullups and inversion */
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}
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/* put a byte into memory */
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void isbc464_put_mbyte(uint16 addr, uint8 val)
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{
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uint32 org, len;
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if ((isbc464_dev.flags & DEV_DIS) == 0) {
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org = isbc464_unit.u3;
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len = isbc464_unit.capac;
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if ((addr >= org) && (addr < (org + len))) {
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SET_XACK(0); /* bad memory address */
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sim_printf ("isbc464_put_mbyte: Read-only Memory\n");
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return;
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} else {
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sim_printf ("isbc464_put_mbyte: Out of range\n");
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SET_XACK(0); /* bad memory address */
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return;
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}
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}
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sim_printf ("isbc464_put_mbyte: Disabled\n");
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SET_XACK(0); /* bad memory address */
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}
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/* end of isbc464.c */
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