1
0
mirror of https://github.com/aap/pdp6.git synced 2026-01-28 13:00:03 +00:00

implemented effective address fetch

This commit is contained in:
aap
2015-11-01 20:55:54 +01:00
parent e4469144de
commit 6374091013
2 changed files with 109 additions and 10 deletions

114
apr.c
View File

@@ -31,7 +31,13 @@ decode_2xx(void)
{
int inst;
inst = apr.ir>>9 & 0777;
apr.fwt = (apr.ir & 0760000) == 0200000;
apr.fwt = (inst & 0760) == 0200;
if(apr.fwt){
apr.fwt_00 = (inst & 03) == 0;
apr.fwt_01 = (inst & 03) == 1;
apr.fwt_10 = (inst & 03) == 2;
apr.fwt_11 = (inst & 03) == 3;
}
if(inst >= 0244 && inst <= 0246 ||
(inst & 0774) == 0234)
apr.fac2 = 1;
@@ -42,14 +48,44 @@ decode_2xx(void)
void
decodeir(void)
{
int inst;
bool iot_a, jrst_a, uuo_a;
apr.fac2 = 0;
apr.boole_as_00 = apr.boole_as_01 = 0;
apr.boole_as_10 = apr.boole_as_11 = 0;
apr.fwt_00 = apr.fwt_01 = apr.fwt_10 = apr.fwt_11 = 0;
apr.hwt_00 = apr.hwt_01 = apr.hwt_10 = apr.hwt_11 = 0;
apr.ir_memac = apr.ir_memac_mem = 0;
decode_ch();
decode_2xx();
uuo_a = (apr.ir & 0700000) == 0;
iot_a = (apr.ir & 0700000) == 0700000;
jrst_a = (apr.ir & 0777000) == 0254000;
inst = apr.ir>>9 & 0777;
/* ACCP v MEMAC */
if((inst & 0700) == 0300){
apr.ir_memac = inst & 0060;
apr.ir_memac_mem = apr.ir_memac && inst & 0010;
}
/* HWT */
if((inst & 0700) == 0500){
apr.hwt_00 = (inst & 03) == 0;
apr.hwt_01 = (inst & 03) == 1;
apr.hwt_10 = (inst & 03) == 2;
apr.hwt_11 = (inst & 03) == 3;
}
if((inst & 0700) == 0600 || (inst & 770) == 0270){
apr.boole_as_00 = (inst & 03) == 0;
apr.boole_as_01 = (inst & 03) == 1;
apr.boole_as_10 = (inst & 03) == 2;
apr.boole_as_11 = (inst & 03) == 3;
}
uuo_a = (inst & 0700) == 0;
iot_a = (inst & 0700) == 0700;
jrst_a = inst == 0254;
// 5-13
apr.ex_ir_uuo =
uuo_a && apr.ex_uuo_sync ||
@@ -172,6 +208,8 @@ pulse(at0);
pulse(iat0);
pulse(mc_wr_rs);
pulse(mc_rd_rq_pulse);
pulse(mc_wr_rq_pulse);
pulse(mc_rdwr_rq_pulse);
// TODO: find A LONG
@@ -321,14 +359,68 @@ pulse(pi_sync){
return at1;
}
/*
* Execute
*/
pulse(et0){
printf("ET0\n");
return NULL;
}
/*
* Fetch
*/
pulse(ft6a){
printf("FT6A\n");
apr.f6a = 0; // 5-4
return et0; // 5-5
}
pulse(ft7){
printf("FT7\n");
apr.f6a = 1; // 5-4
apr.mc_rst1_ret = ft6a;
return mc_rdwr_rq_pulse;
}
pulse(ft6){
printf("FT6\n");
apr.f6a = 1; // 5-4
apr.mc_rst1_ret = ft6a;
return mc_rd_rq_pulse;
}
pulse(ft5){
bool fc_e, fc_e_pse;
int inst;
printf("FT5\n");
apr.ma = apr.mb & RT; // 7-3
return NULL;
inst = apr.ir>>9 & 0777;
// 5-4
fc_e = (inst & 0710) == 0610 || /* ACBM DIR */
(inst & 0770) == 0310 || /* ACCP DIR */
apr.boole_as_00 || apr.ch_n_inc_op || apr.ch_load ||
apr.fwt_00 || apr.hwt_00 ||
apr.ir_iot && (apr.ir & 000034) == 000014 || /* DATAO */
(inst & 0740) == 0140 || /* IR FP */
(inst & 0760) == 0220 && (inst & 0003) != 1 || /* MD FC(E) */
inst == 0256 || /* XCT */
(inst & 0776) == 0260; /* PUSH */
fc_e_pse = apr.boole_as_10 || apr.boole_as_11 ||
apr.ch_dep || apr.ch_inc_op ||
apr.fwt_11 || apr.hwt_10 || apr.hwt_11 ||
apr.ir_iot && (apr.ir & 000024) == 0 || /* IOT BLK */
inst == 0250 || /* EXCH */
apr.ir_memac_mem;
if(fc_e)
return ft6;
if(fc_e_pse)
return ft7;
return ft6a;
}
pulse(ft4a){
@@ -395,15 +487,17 @@ pulse(ft1){
pulse(ft0){
bool fac_inh;
int inst;
printf("FT0\n");
// 5-4
inst = apr.ir>>9 & 0777;
fac_inh = apr.ch_inc_op || apr.ch_n_inc_op || apr.ch_load ||
apr.ex_ir_uuo || apr.fwt && (apr.ir & 0003000) != 0002000 ||
(apr.ir & 0703000) == 0503000 || apr.ir_iot ||
(apr.ir & 0774000) == 0254000 || /* 254-257 */
(apr.ir & 0776000) == 0264000 || /* JSR, JSP */
(apr.ir & 0700000) == 0300000 && (apr.ir & 0060000); /* MEMAC */
apr.ex_ir_uuo || apr.fwt_10 ||
(inst & 0703) == 0503 || apr.ir_iot ||
(inst & 0774) == 0254 || /* 254-257 */
(inst & 0776) == 0264 || /* JSR, JSP */
apr.ir_memac_mem;
if(fac_inh)
return ft5; // 5-4
return ft1; // 5-4

5
pdp6.h
View File

@@ -77,11 +77,16 @@ struct Apr {
/* temporaries */
bool ex_inh_rel;
/* decoded instructions */
bool ch_inc, ch_inc_op, ch_n_inc_op, ch_load, ch_dep;
bool ex_ir_uuo, ir_iot, ir_jrst;
bool fwt;
bool fac2, fc_c_acrt, fc_c_aclt;
bool boole_as_00, boole_as_01, boole_as_10, boole_as_11;
bool fwt_00, fwt_01, fwt_10, fwt_11;
bool hwt_00, hwt_01, hwt_10, hwt_11;
bool ir_memac, ir_memac_mem;
/* needed for the emulation */
int extpulse;