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51 lines
990 B
C
51 lines
990 B
C
#include "pdp6.h"
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word memory[256*1024];
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//hword maxmem = 256*1024;
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hword maxmem = 64*1024;
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word fmem[16];
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word membus0, membus1;
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word *hold;
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void
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initmem(void)
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{
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FILE *f;
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word w;
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hword a;
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if(f = fopen("mem", "r"), f == NULL)
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return;
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for(a = 0; a < maxmem && fscanf(f, "%lo", &w) != EOF; a++)
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memory[a] = w;
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fclose(f);
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}
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void
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wakemem(void)
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{
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hword a;
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if(membus0 & MEMBUS_RQ_CYC){
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a = membus0>>4 & 037777;
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if(membus0 & MEMBUS_MA21_1) a |= 0040000;
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if(membus0 & MEMBUS_MA20_1) a |= 0100000;
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if(membus0 & MEMBUS_MA19_1) a |= 0200000;
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if(membus0 & MEMBUS_MA18_1) a |= 0400000;
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if(a >= maxmem ||
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membus0 & MEMBUS_MA_FMC_SEL1 && a >= 16)
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return;
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membus0 |= MEMBUS_MAI_ADDR_ACK;
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hold = membus0 & MEMBUS_MA_FMC_SEL1 ? &fmem[a] : &memory[a];
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if(membus0 & MEMBUS_RD_RQ){
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membus1 = *hold;
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membus0 |= MEMBUS_MAI_RD_RS;
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hold = NULL;
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}
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}
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if(membus0 & MEMBUS_MAI_WR_RS && hold){
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*hold = membus1;
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membus0 &= ~MEMBUS_MAI_WR_RS;
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hold = NULL;
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}
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}
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