forked from mmoller2k/emu41gcc
/
nutcpu.c
1525 lines (1414 loc) · 32.6 KB
/
nutcpu.c
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/* ****************************************** */
/* Emu41: HP-41C software emulator for PC */
/* */
/* nutcpu.c NUT CPU simulator module */
/* */
/* Version 2.5, J-F Garnier 1997-2007 */
/* ****************************************** */
/* Conditional compilation:
VERS_ASM: use nutcpu2.asm
FPU: support of FPU (not implemented)
*/
#include <mem.h>
#include <stdio.h>
#include <dos.h>
/* global variables */
#define GLOBAL extern
#include "nutcpu.h"
#include "display.h"
#include "timer.h"
#include "hpil.h"
#define LOCAL static near
/* delay for LCD stable before detecting LCD change (unit=opcode counter) */
#define LCDDELAY 100
/* delay for LCD off stable before detecting LCD off */
#define LCDOFFDELAY 500
/* field code table */
static int coded[16] = {3,4,5,10,8,6,11,15,2,9,7,13,1,12,0,14 };
/* ****************************************** */
/* int fetch1(unsigned int adr) */
/* */
/* fetch one opcode from address adr */
/* ****************************************** */
int fetch1(unsigned int adr)
{
int p0, n;
static short *ptr=NULL;
static unsigned int lastaddr=0xffff;
/* lastaddr holds the last addr + 1 to avoid pointer calculations
when fetching successive words */
if (adr!=lastaddr) {
lastaddr=adr;
p0=adr>>12; /* page number*/
adr &=0xfff;
if (tabpage[p0]==0) {
/* nonexistent page */
lastaddr=0xffff;
return(0);
}
/* setup pointer */
//ptr= (int far *) MK_FP(tabpage[p0],adr<<1);
ptr = tabpage[p0]+adr;
}
n=*ptr++;
lastaddr++;
return(n);
}
/* ****************************************** */
/* wmldl1(adr, mot) */
/* */
/* write one word at address adr */
/* in code space */
/* ****************************************** */
void wmldl1(unsigned int adr, int mot)
{
int p0;
unsigned short *ptr;
p0=adr>>12; /* page number */
adr &=0xfff;
if (tabpage[p0]==0) return;
//ptr= (unsigned int far *) MK_FP(tabpage[p0],adr<<1);
ptr = tabpage[p0]+adr;
*ptr = mot;
}
/* ****************************************** */
/* int execp(int mot) */
/* */
/* execute the smart peripheral opcodes */
/* (HPIL and HP82143) */
/* ****************************************** */
int execp(int mot)
{
int n, ret;
ret=0;
Carry=0;
if (selper<8) {
/* HPIL */
switch (mot&3) {
case 1: /* CH= n */
hpil_wr(selper,mot>>2);
break;
case 2: /* RDPTRN n */
if (((mot>>2)&0x0e)==0x0e) {
n=hpil_rd(selper);
memset(regC,0,14);
regC[0]=n&15;
regC[1]=n>>4;
}
break;
case 3: /* ?PFSET n */
break;
} /* end case */
}
else if (selper==9) {
/* HP82143A printer */
if ((mot&7)==7) {
/* LOAD */
print_char((regC[1]<<4)+regC[0]);
}
else if ((mot&0x3f)==0x3a) {
/* SAVE */
memset(regC,0,14);
n=get_printer_status();
if (n!=0) {
regC[13]=(n>>12)&15;
regC[12]=(n>>8)&15;
regC[11]=(n>>4)&15;
regC[10]=n&15;
}
}
else if ((mot&0x3f)==0x03) {
/* SET */
Carry=test_printer_flag((mot>>6)&3);
}
}
/* test if last smart opcodes */
if (mot&1) {
smartp=0;
}
return(ret);
}
#ifndef VERS_ASM
/* ****************************************** */
/* int popaddr() */
/* */
/* pop an address from stack */
/* ****************************************** */
int LOCAL popaddr(void)
{
int a;
a=retstk[0];
retstk[0]=retstk[1];
retstk[1]=retstk[2];
retstk[2]=retstk[3];
retstk[3]=0;
return(a);
}
/* ****************************************** */
/* pushaddr(int a) */
/* */
/* push an address to stack */
/* ****************************************** */
void LOCAL pushaddr(int a)
{
retstk[3]=retstk[2];
retstk[2]=retstk[1];
retstk[1]=retstk[0];
retstk[0]=a;
}
#endif
/* ****************************************** */
/* int fieldaddr() */
/* */
/* decodes the address field from a register */
/* ****************************************** */
int LOCAL fieldaddr(unsigned char *reg)
{
int n;
n=reg[3];
n += reg[4]<<4;
n += reg[5]<<8;
n += reg[6]<<12;
return(n);
}
/* ****************************************** */
/* int storeData(int adr) */
/* */
/* store the C register into a RAM register, */
/* or write to the selected peripheral device */
/* ****************************************** */
int storeData(int adr)
{
unsigned char *ptr;
unsigned char *reg;
int i, n, ret;
ret=0;
reg=regC;
/* RAM register */
n=regData&0x3ff; /* bug fix 11/10/05, thanks to Simon S. */
ptr=&espaceRAM[n*8];
if ((*ptr++)==0) {
for (i=0;i<7;i++) {
*ptr = (*reg++);
*ptr += (*reg++) <<4;
ptr++;
}
}
if (regPer==0xfd) {
/* display */
if (adr==-1)
display_wr();
else
display_wr_n(adr);
if (dspon) facces_dsp=LCDDELAY;
}
if (regPer==0xfb) {
/* clock */
if (adr==-1)
timer_wr_n(0);
else
timer_wr_n(adr);
}
return(ret);
}
/* ****************************************** */
/* int recallData(int adr) */
/* */
/* read a RAM register into C, */
/* or read the selected peripheral device */
/* ****************************************** */
int recallData(int adr)
{
unsigned char *ptr;
unsigned char *reg;
int i, n, ret;
ret=0;
switch (regPer) {
case 0xfe:
/* optical wand */
break;
case 0xfd:
/* display */
display_rd_n(adr);
if (dspon&&(adr>2)&&(adr!=5)) facces_dsp=LCDDELAY; /* added adr tests JFG 29/12/03 */
break;
case 0xfc:
/* card reader */
reg=regC;
for (i=0;i<7;i++) {
*reg++ = 0;
*reg++ = 0;
}
break;
case 0xfb:
/* clock */
timer_rd_n(adr);
break;
default:
/* RAM register */
reg=regC;
n=regData&0x3ff; /* bug fix 11/10/05, thanks to Simon S. */
ptr=&espaceRAM[n*8];
if ((*ptr++)==0) {
for (i=0;i<7;i++) {
*reg++ = (*ptr) & 15;
*reg++ = (*ptr)>>4;
ptr++;
}
}
else {
for (i=0;i<7;i++) {
*reg++ = 0;
*reg++ = 0;
}
}
} /* end switch */
return(ret);
}
/* ****************************************** */
/* enrom(int page, int n) */
/* */
/* enable a block of a page */
/* ****************************************** */
void enrom(int page,int n)
{
int i;
page &=15;
switch (typmod[page]) {
case 2:
/* CXTIME */
if ((n==0)||(n==1)) tabpage[5]=tabbank[5][n];
break;
case 3:
/* Advantage */
if ((n==0)||(n==1)) tabpage[page|1]=tabbank[page|1][n];
break;
case 4:
/* HEPAX */
tabpage[page]=tabbank[page][n];
break;
case 6:
/* IR PRINTER */
if ((n==0)||(n==1)) tabpage[6]=tabbank[6][n];
break;
case 8:
case 9:
/* W&W RAMBOX II */
if (n==0) {
/* reset pages to bloc A */
for (i=8;i<16;i++) {
if ((typmod[i]==8)||(typmod[i]==9))
tabpage[i]=tabbank[i][0];
}
}
else if (n==1) {
/* enable odd pages from block B */
for (i=9;i<16;i+=2) {
if ((typmod[i]==8)||(typmod[i]==9))
tabpage[i]=tabbank[i][1];
}
}
else if (n==2) {
/* enable even pages from block B */
for (i=8;i<16;i+=2) {
if ((typmod[i]==8)||(typmod[i]==9))
tabpage[i]=tabbank[i][1];
}
}
break;
}
fetch1(0); /* just to reset addr calculations */
}
/* ****************************************** */
/* int wmldl() */
/* */
/* write the C register into the code space */
/* ****************************************** */
void wmldl(void)
{
unsigned int adr;
int i, n, typ;
static int esrsu=0;
adr=fieldaddr(regC);
n=regC[0]+(regC[1]<<4)+(regC[2]<<8);
n &= 0x3ff;
if (adr==0) {
/* Eramco ES RSU special case: writing to address 0 switches RSU pages */
switch (n) {
case 0x006: esrsu &= 2; break;
case 0x007: esrsu &= 1; break;
case 0x106: esrsu |= 1; break;
case 0x107: esrsu |= 2; break;
}
for (i=8;i<=13;i++) {
if ( (typmod[i]==10)||(typmod[i]==11) )
tabpage[i]=tabbank[i][esrsu];
}
}
else {
typ=typmod[adr>>12];
/* test if the page is writable */
if ( ( (typ==5) && (fhram[adr>>12]==0) )
|| ( typ==7 )
|| ( typ==9 )
|| ( typ==11 ) ) {
wmldl1(adr,n);
}
}
}
/* ****************************************** */
/* dokey() */
/* */
/* manage the state machine for virtual keys */
/* ****************************************** */
void dokey(void)
{
int i;
switch (flagKey) {
case 0: /* idle state, wait for a key*/
if (lgkeybuf) {
/* at least a key available, simulates a key pressed */
regK=keybuffer[0];
flagKB=1; /* 03/01/04 */
for (i=1;i<lgkeybuf;i++)
keybuffer[i-1]=keybuffer[i];
lgkeybuf--;
flagKey=1; /* key pressed */
cptKey=cptinstr;
}
break;
case 1: /* pressed key state, wait for key released */
if ((cptinstr-cptKey)>200) {
flagKey=2; /* key released */
cptKey=cptinstr;
}
break;
case 2: /* released, wait for next key to be pressed */
if ((cptinstr-cptKey)>200) {
flagKey=0; /* idle */
cptKey=cptinstr;
}
break;
} /* end case */
}
/* ****************************************** */
/* int exec0(int mot) */
/* */
/* type 0 opcode execute */
/* ****************************************** */
int LOCAL exec0(int mot)
{
int par;
int ret;
int i, n;
char buf[16];
par=mot>>6;
ret=0;
switch (mot>>2) {
case 0: /* NOP */
Carry=0;
break;
case 1*16: /* WMLDL */
Carry=0;
wmldl();
if (breakcode==2) ret=3; /* 04/01 */
fjmp=1; /* 30/10/05 for ES-RSU */
break;
case 2*16:
ret=3; /* breakpoint */
break;
case 3*16: /* FPU extension (Emu41) - not implemented */
#ifdef FPU
n=fetch1(regPC);
regPC++;
ret=FPUext(n);
#endif
Carry=0;
break;
case 4*16: /* ENROM1 */
enrom(regPC>>12,0);
break;
case 5*16: /* ENROM3 (HEPAX) */
enrom(regPC>>12,2);
break;
case 6*16: /* ENROM2 */
enrom(regPC>>12,1);
break;
case 7*16: /* ENROM4 (HEPAX) */
enrom(regPC>>12,3);
break;
case 8*16:
case 9*16:
case 10*16:
case 11*16:
case 12*16:
case 13*16:
case 14*16:
case 15*16:
/* HPIL=C n */
par -=8;
hpil_wr(par,(regC[1]<<4)+regC[0]);
Carry=0;
break;
#ifndef VERS_ASM
case 0*16+1:
case 1*16+1:
case 2*16+1:
case 3*16+1:
case 4*16+1:
case 5*16+1:
case 6*16+1:
case 7*16+1:
case 8*16+1:
case 9*16+1:
case 10*16+1:
case 11*16+1:
case 12*16+1:
case 13*16+1:
case 14*16+1:
regST &= ~(1<<coded[par]); /* ST=0 n */
Carry=0;
break;
case 15*16+1:
regST &=0xff00; /* CLRST */
Carry=0;
break;
case 0*16+2:
case 1*16+2:
case 2*16+2:
case 3*16+2:
case 4*16+2:
case 5*16+2:
case 6*16+2:
case 7*16+2:
case 8*16+2:
case 9*16+2:
case 10*16+2:
case 11*16+2:
case 12*16+2:
case 13*16+2:
case 14*16+2:
regST |= (1<<coded[par]); /* ST=1 n */
Carry=0;
break;
case 15*16+2: /* RSTKB */
dokey(); /* manage the key state macchine */
if (flagKey!=1) {
flagKB=0; regK=0; /* no key down, reset internal registers */
}
Carry=0;
break;
case 0*16+3:
case 1*16+3:
case 2*16+3:
case 3*16+3:
case 4*16+3:
case 5*16+3:
case 6*16+3:
case 7*16+3:
case 8*16+3:
case 9*16+3:
case 10*16+3:
case 11*16+3:
case 12*16+3:
case 13*16+3:
case 14*16+3:
Carry=((regST>>coded[par])&1); /* ?ST=1 n */
break;
case 15*16+3: /* CHKKB */
dokey(); /* manage the key state macchine */
Carry=flagKB;
break;
case 0*16+4:
case 1*16+4:
case 2*16+4:
case 3*16+4:
case 4*16+4:
case 5*16+4:
case 6*16+4:
case 7*16+4:
case 8*16+4:
case 9*16+4:
case 10*16+4:
case 11*16+4:
case 12*16+4:
case 13*16+4:
case 14*16+4:
case 15*16+4:
/* LC h */
n=regPQ[regPT];
regC[n]=par;
n--;
if (n<0) n=13;
regPQ[regPT]=n;
Carry=0;
break;
case 0*16+5:
case 1*16+5:
case 2*16+5:
case 3*16+5:
case 4*16+5:
case 5*16+5:
case 6*16+5:
case 7*16+5:
case 8*16+5:
case 9*16+5:
case 10*16+5:
case 11*16+5:
case 12*16+5:
case 13*16+5:
case 14*16+5:
Carry=(regPQ[regPT]==coded[par]); /* ?PT= n */
break;
case 15*16+5:
n=regPQ[regPT]; /* DECPT */
n--;
if (n<0) n=13;
regPQ[regPT]=n;
Carry=0;
break;
case 1*16+6: /* G=C */
n=regPQ[regPT];
regG=regC[n];
n++; if (n>13) n=0;
regG += regC[n]<<4;
Carry=0;
break;
case 2*16+6: /* C=G */
n=regPQ[regPT];
regC[n]=regG&15;
n++; if (n>13) n=0;
regC[n]=(regG>>4)&15;
Carry=0;
break;
case 3*16+6: /* CGEX */
n=regPQ[regPT];
i=regG;
regG=regC[n];
regC[n]=i&15;
n++; if (n>13) n=0;
regG += regC[n]<<4;
regC[n]=(i>>4)&15;
Carry=0;
break;
case 5*16+6: /* M=C */
memcpy(regM,regC,14);
Carry=0;
break;
case 6*16+6: /* C=M */
memcpy(regC,regM,14);
Carry=0;
break;
case 7*16+6: /* CMEX */
memcpy(buf,regC,14);
memcpy(regC,regM,14);
memcpy(regM,buf,14);
Carry=0;
break;
case 9*16+6: /* F=SB */
regFO=regST&0xff;
Carry=0;
break;
case 10*16+6: /* SB=F */
regST &= 0xff00;
regST |= regFO;
Carry=0;
break;
case 11*16+6: /* FEXSB */
n=regFO;
regFO=regST&0xff;
regST &= 0xff00;
regST |= n;
Carry=0;
break;
case 12*16+6: /* ?? in SV Forth ... */
Carry=0;
break;
case 13*16+6: /* ST=C */
regST &= 0xff00;
regST |= regC[0]+(regC[1]<<4);
Carry=0;
break;
case 14*16+6: /* C=ST */
regC[0]=regST&15;
regC[1]=(regST>>4)&15;
Carry=0;
break;
case 15*16+6: /* CSTEX */
n=regST;
regST &= 0xff00;
regST |= regC[0]+(regC[1]<<4);
regC[0]=n&15;
regC[1]=(n>>4)&15;
Carry=0;
break;
case 0*16+6:
case 4*16+6:
case 8*16+6:
ret=2;
Carry=0;
break;
case 0*16+7:
case 1*16+7:
case 2*16+7:
case 3*16+7:
case 4*16+7:
case 5*16+7:
case 6*16+7:
case 7*16+7:
case 8*16+7:
case 9*16+7:
case 10*16+7:
case 11*16+7:
case 12*16+7:
case 13*16+7:
case 14*16+7:
regPQ[regPT]=coded[par]; /* PT= n */
Carry=0;
break;
case 15*16+7:
n=regPQ[regPT]; /* INCPT */
n++;
if (n>13) n=0;
regPQ[regPT]=n;
Carry=0;
break;
case 0*16+8: /* SPOPND */
popaddr();
Carry=0;
break;
case 1*16+8: /* POWOFF */
Carry=(dspon==0);
/* flagKB=0; 03/01/04 */
ret=1;
break;
case 2*16+8: /* SELP */
regPT=0;
Carry=0;
break;
case 3*16+8: /* SELQ */
regPT=1;
Carry=0;
break;
case 4*16+8: /* ?P=Q */
Carry= (regPQ[0]==regPQ[1]);
break;
case 5*16+8: /* LLD */
Carry=0;
break;
case 6*16+8: /* CLRABC */
memset(regA,0,14);
memset(regB,0,14);
memset(regC,0,14);
Carry=0;
break;
case 7*16+8: /* GOTOC */
regPC=fieldaddr(regC);
fjmp=1;
Carry=0;
break;
case 8*16+8: /* C=KEYS */
dokey(); /* manage the key state macchine */
regC[3]=regK&15;
regC[4]=(regK>>4)&15;
Carry=0;
break;
case 9*16+8: /* SETHEX */
flagdec=0;
Carry=0;
break;
case 10*16+8:; /* SETDEC */
flagdec=1;
Carry=0;
break;
case 11*16+8:; /* DISOFF */
if (dspon) facces_dsp=LCDOFFDELAY; /* 24/12/03 */
dspon=0;
Carry=0;
break;
case 12*16+8:; /* DISTOG */
dspon=!dspon;
facces_dsp=LCDDELAY; /* 04/01/04 */
Carry=0;
break;
case 13*16+8:; /* RTNC */
if (Carry) {
regPC=popaddr();
fjmp=1;
}
Carry=0;
break;
case 14*16+8:; /* RTNNC */
if (!Carry) {
regPC=popaddr();
fjmp=1;
}
Carry=0;
break;
case 15*16+8:; /* RTN */
regPC=popaddr();
fjmp=1;
Carry=0;
break;
case 0*16+9: /* SELPF */
case 1*16+9:
case 2*16+9:
case 3*16+9:
case 4*16+9:
case 5*16+9:
case 6*16+9:
case 7*16+9:
case 8*16+9:
case 9*16+9:
case 10*16+9:
case 11*16+9:
case 12*16+9:
case 13*16+9:
case 14*16+9:
case 15*16+9:
selper=par;
smartp=1; /* enable smart periph. opcodes */
Carry=0;
if (breakcode&1)
if (par==9)
ret=3;
break;
#endif
case 0*16+10: /* REGN=C n */
case 1*16+10:
case 2*16+10:
case 3*16+10:
case 4*16+10:
case 5*16+10:
case 6*16+10:
case 7*16+10:
case 8*16+10:
case 9*16+10:
case 10*16+10:
case 11*16+10:
case 12*16+10:
case 13*16+10:
case 14*16+10:
case 15*16+10:
regData &= 0xff0;
regData |= par;
ret=storeData(par);
Carry=0;
break;
case 0*16+11: /* ?Fx=1 */
case 1*16+11:
case 2*16+11:
case 3*16+11:
case 4*16+11:
case 5*16+11:
case 6*16+11:
case 7*16+11:
case 8*16+11:
case 9*16+11:
case 10*16+11:
case 11*16+11:
case 12*16+11:
case 13*16+11:
case 14*16+11:
case 15*16+11:
Carry=((regFI>>coded[par])&1);
break;
case 0*16+12: /* ROMBLK (HEPAX) (or DISBLK in Voyager)*/
for (i=3;i<16;i++) {
if (typmod[i]==4) {
n=regC[0];
/* map bank HEPAX in page n */
tabpage[n] = tabpage[i];
tabbank[n][0]=tabbank[i][0];
tabbank[n][1]=tabbank[i][1];
tabbank[n][2]=tabbank[i][2];
tabbank[n][3]=tabbank[i][3];
typmod[n]=4;
/* remap RAM HEPAX in the free page */
tabpage[i&15]=tabpage[i|1]-512;
tabbank[i][0]=0;
tabbank[i][1]=0;
tabbank[i][2]=0;
tabbank[i][3]=0;
typmod[i]=5;
break;
}
}
Carry=0;
break;
#ifndef VERS_ASM
case 1*16+12: /* N=C */
memcpy(regN,regC,14);
Carry=0;
break;
case 2*16+12: /* C=N */
memcpy(regC,regN,14);
Carry=0;
break;
case 3*16+12: /* CNEX */
memcpy(buf,regC,14);
memcpy(regC,regN,14);
memcpy(regN,buf,14);
Carry=0;
break;
case 4*16+12: /* LDI nnn */
n=fetch1(regPC);
regPC++;
regC[0]=n&15;
regC[1]=(n>>4)&15;
regC[2]=(n>>8)&15;
Carry=0;
break;
case 5*16+12: /* STK=C */
pushaddr(fieldaddr(regC));
Carry=0;
break;
case 6*16+12: /* C=STK */
n=popaddr();
regC[3]=n&15;
regC[4]=(n>>4)&15;
regC[5]=(n>>8)&15;
regC[6]=(n>>12)&15;
Carry=0;
break;
#endif
case 7*16+12: /* WPTOG (HEPAX) */
fhram[regC[0]] = !fhram[regC[0]];
Carry=0;
break;
#ifndef VERS_ASM
case 8*16+12: /* GOKEYS */
regPC &= 0xff00;
regPC |= regK;
fjmp=1;
Carry=0;
break;
case 9*16+12: /* DADD=C */
regData=regC[0]+(regC[1]<<4)+(regC[2]<<8);
regPer=0;
Carry=0;
break;
case 10*16+12: /* CLREGS on Voyager, but not implemented */
Carry=0;
break;
#endif
case 11*16+12: /* DATA=C */
ret=storeData(-1);
Carry=0;
break;
#ifndef VERS_ASM
case 12*16+12: /* CXISA */
n=fieldaddr(regC);
n=fetch1(n);
regC[0]=n&15;
regC[1]=(n>>4)&15;
regC[2]=(n>>8)&15;
Carry=0;
break;
case 13*16+12: /* C=C!A */
for (i=0;i<14;i++)
regC[i] |= regA[i];
Carry=0;
break;
case 14*16+12:; /* C=C&A */
for (i=0;i<14;i++)
regC[i] &= regA[i];
Carry=0;
break;
case 15*16+12:; /* PFAD=C */
regPer=regC[0]+(regC[1]<<4);
Carry=0;
break;
#endif