245 lines
7.8 KiB
C
245 lines
7.8 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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#if defined (SBC464_NUM) && (SBC464_NUM > 0)
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#define BASE_ADDR u3
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/* prototypes */
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t_stat isbc464_set_base(UNIT *uptr, int32 val, CONST char *cptr, void *desc);
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t_stat isbc464_set_size(UNIT *uptr, int32 val, CONST char *cptr, void *desc);
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t_stat isbc464_show_param (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
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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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/* 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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int isbc464_onetime = 1;
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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+
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UNIT_MUSTBUF, 0)
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};
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MTAB isbc464_mod[] = {
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{ MTAB_XTD | MTAB_VDV, 0, NULL, "SIZE", &isbc464_set_size,
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NULL, NULL, "Sets the ROM size for iSBC464" },
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{ MTAB_XTD | MTAB_VDV, 0, NULL, "BASE", &isbc464_set_base,
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NULL, NULL, "Sets the ROM base for iSBC464" },
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{ MTAB_XTD|MTAB_VDV, 0, "PARAM", NULL, NULL, &isbc464_show_param, NULL,
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"Parameter" },
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{ 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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isbc464_mod, //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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&isbc464_reset, //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_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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// set size parameter
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t_stat isbc464_set_size(UNIT *uptr, int32 val, CONST char *cptr, void *desc)
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{
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uint32 size, result, i;
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if (cptr == NULL)
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return SCPE_ARG;
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result = sscanf(cptr, "%i%n", &size, &i);
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if ((result == 1) && (cptr[i] == 'K') && ((cptr[i + 1] == 0) ||
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((cptr[i + 1] == 'B') && (cptr[i + 2] == 0)))) {
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switch (size) {
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case 0x10: //16K
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uptr->capac = 16384;
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break;
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case 0x20: //32K
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uptr->capac = 32768;
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break;
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case 0x30: //48K
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uptr->capac = 49152;
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break;
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case 0x40: //64K
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uptr->capac = 65536;
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break;
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default:
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sim_printf("SBC464: Size error\n");
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return SCPE_ARG;
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}
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sim_printf("SBC464: Size=%04X\n", uptr->capac);
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return SCPE_OK;
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}
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return SCPE_ARG;
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}
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// set base address parameter
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t_stat isbc464_set_base(UNIT *uptr, int32 val, CONST char *cptr, void *desc)
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{
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uint32 size, result, i;
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if (cptr == NULL)
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return SCPE_ARG;
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result = sscanf(cptr, "%i%n", &size, &i);
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if ((result == 1) && (cptr[i] == 'K') && ((cptr[i + 1] == 0) ||
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((cptr[i + 1] == 'B') && (cptr[i + 2] == 0)))) {
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switch (size) {
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case 0x00: //0K
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uptr->BASE_ADDR = 0;
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break;
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case 0x10: //16K
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uptr->BASE_ADDR = 16384;
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break;
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case 0x20: //32K
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uptr->BASE_ADDR = 32768;
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break;
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case 0x30: //48K
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uptr->BASE_ADDR = 49152;
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break;
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default:
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sim_printf("SBC464: Base error\n");
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return SCPE_ARG;
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}
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sim_printf("SBC464: Base=%04X\n", uptr->BASE_ADDR);
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return SCPE_OK;
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}
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return SCPE_ARG;
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}
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// show configuration parameters
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t_stat isbc464_show_param (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
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{
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fprintf(st, "%s Size=%04X Base=%04X ",
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((isbc464_dev.flags & DEV_DIS) == 0) ? "Enabled" : "Disabled",
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uptr->capac, uptr->BASE_ADDR);
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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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if (isbc464_onetime) {
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isbc464_dev.units->capac = SBC464_SIZE; //set default size
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isbc464_dev.units->BASE_ADDR = SBC464_BASE; //set default base
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isbc464_onetime = 0;
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}
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if (dptr == NULL)
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return SCPE_ARG;
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if ((dptr->flags & DEV_DIS) == 0) { //already enabled
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isbc464_dev.units->filebuf = (uint8 *)calloc(isbc464_dev.units->capac, sizeof(uint8)); //alloc buffer
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if (isbc464_dev.units->filebuf == NULL) { //CALLOC error
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sim_printf (" sbc464: Calloc error\n");
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return SCPE_MEM;
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}
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sim_printf(" sbc464: Enabled 0%04XH bytes at base 0%04XH\n",
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isbc464_dev.units->capac, isbc464_dev.units->BASE_ADDR);
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} else {
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if (isbc464_dev.units->filebuf)
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free(isbc464_dev.units->filebuf); //return allocated memory
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sim_printf(" sbc464: Disabled\n");
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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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uint8 val;
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val = *((uint8 *)isbc464_unit.filebuf + (addr - isbc464_unit.BASE_ADDR));
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return (val & 0xFF);
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}
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#endif /* SBC464_NUM > 0 */
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/* end of isbc464.c */
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