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TIMER: Add mechanism to pre-calibrate the instruction execution rate

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This commit is contained in:
Mark Pizzolato
2019-05-28 23:56:58 -07:00
parent 48db10994d
commit f75f28aa21
9 changed files with 114 additions and 3 deletions
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17
PDP8/pdp8_cpu.c
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@@ -1371,6 +1371,19 @@ pcq_r->qptr = pcq_p; /* update pc q ptr */
return reason;
} /* end sim_instr */
/*
* This sequence of instructions is a mix that hopefully
* represents a resonable instruction set that is a close
* estimate to the normal calibrated result.
*/
static const char *pdp8_clock_precalibrate_commands[] = {
"-m 100 ISZ 110",
"-m 101 JMP 100",
"-m 102 JMP 100",
"PC 100",
NULL};
/* Reset routine */
t_stat cpu_reset (DEVICE *dptr)
@@ -1382,7 +1395,9 @@ UF = UB = gtf = emode = 0;
pcq_r = find_reg ("PCQ", NULL, dptr);
if (pcq_r)
pcq_r->qptr = 0;
else return SCPE_IERR;
else
return SCPE_IERR;
sim_clock_precalibrate_commands = pdp8_clock_precalibrate_commands;
sim_brk_types = SWMASK ('E') | SWMASK('I');
sim_brk_dflt = SWMASK ('E');
return SCPE_OK;