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/* scelbi_sys.c: Intel 8008 CPU system interface for the SCELBI computer.
Copyright (c) 2017, Hans-Ake Lund
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
ROBERT M SUPNIK 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 Hans-Ake Lund shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Hans-Ake Lund.
04-Sep-17 HAL Working version of CPU simulator for SCELBI computer
12-Sep-17 HAL Modules restructured in "Intel-Systems" directory
*/
#include "system_defs.h"
extern DEVICE cpu_dev;
extern UNIT cpu_unit;
extern REG cpu_reg[];
extern DEVICE tty_dev;
extern DEVICE ptr_dev;
extern unsigned char Mem[];
extern int32 saved_PCreg;
/* SCP data structures
sim_name simulator name string
sim_PC pointer to saved PC register descriptor
sim_emax number of words needed for examine
sim_devices array of pointers to simulated devices
sim_stop_messages array of pointers to stop messages
sim_load binary loader
*/
char sim_name[] = "SCELBI";
REG *sim_PC = &cpu_reg[0];
int32 sim_emax = 4;
DEVICE *sim_devices[] = {
&cpu_dev,
&tty_dev,
&ptr_dev,
NULL
};
const char *sim_stop_messages[] = {
"Unknown error",
"Unknown I/O Instruction",
"HALT instruction",
"Breakpoint",
"Invalid Opcode"
};
/* This is the binary loader. The input file is considered to be
a string of literal bytes with no format special format. The
load starts at the current value of the PC.
*/
t_stat sim_load (FILE *fileref, CONST char *cptr, CONST char *fnam, int flag)
{
int32 i, addr = 0, cnt = 0;
if (*cptr != 0)
return SCPE_ARG;
if (flag != 0) {
sim_printf ("DUMP command not supported.\n");
return SCPE_ARG;
}
addr = saved_PCreg;
while ((i = getc (fileref)) != EOF) {
if (addr >= MAXMEMSIZE)
return (SCPE_NXM);
Mem[addr] = i;
addr++;
cnt++;
} /* end while */
sim_printf ("%d Bytes loaded.\n", cnt);
return (SCPE_OK);
}