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1 | /* pdp8_tsc.c: PDP-8 ETOS timesharing option board (TSC8-75)\r |
2 | \r | |
3 | Copyright (c) 2003-2005, Robert M Supnik\r | |
4 | \r | |
5 | Permission is hereby granted, free of charge, to any person obtaining a\r | |
6 | copy of this software and associated documentation files (the "Software"),\r | |
7 | to deal in the Software without restriction, including without limitation\r | |
8 | the rights to use, copy, modify, merge, publish, distribute, sublicense,\r | |
9 | and/or sell copies of the Software, and to permit persons to whom the\r | |
10 | Software is furnished to do so, subject to the following conditions:\r | |
11 | \r | |
12 | The above copyright notice and this permission notice shall be included in\r | |
13 | all copies or substantial portions of the Software.\r | |
14 | \r | |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r | |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r | |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL\r | |
18 | ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r | |
19 | IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r | |
20 | CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r | |
21 | \r | |
22 | Except as contained in this notice, the name of Robert M Supnik shall not be\r | |
23 | used in advertising or otherwise to promote the sale, use or other dealings\r | |
24 | in this Software without prior written authorization from Robert M Supnik.\r | |
25 | \r | |
26 | This module is based on Bernhard Baehr's PDP-8/E simulator\r | |
27 | \r | |
28 | PDP-8/E Simulator Source Code\r | |
29 | \r | |
30 | Copyright ) 2001-2003 Bernhard Baehr\r | |
31 | \r | |
32 | TSC8iots.c - IOTs for the TSC8-75 Board plugin\r | |
33 | \r | |
34 | This program is free software; you can redistribute it and/or modify\r | |
35 | it under the terms of the GNU General Public License as published by\r | |
36 | the Free Software Foundation; either version 2 of the License, or\r | |
37 | (at your option) any later version.\r | |
38 | \r | |
39 | This program is distributed in the hope that it will be useful,\r | |
40 | but WITHOUT ANY WARRANTY; without even the implied warranty of\r | |
41 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r | |
42 | GNU General Public License for more details.\r | |
43 | \r | |
44 | You should have received a copy of the GNU General Public License\r | |
45 | along with this program; if not, write to the Free Software\r | |
46 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA\r | |
47 | \r | |
48 | tsc TSC8-75 option board\r | |
49 | */\r | |
50 | \r | |
51 | #include "pdp8_defs.h"\r | |
52 | \r | |
53 | extern int32 int_req;\r | |
54 | extern int32 SF;\r | |
55 | extern int32 tsc_ir; /* "ERIOT" */\r | |
56 | extern int32 tsc_pc; /* "ERTB" */\r | |
57 | extern int32 tsc_cdf; /* "ECDF" */\r | |
58 | extern int32 tsc_enb; /* enable */\r | |
59 | \r | |
60 | #define UNIT_V_SN699 (UNIT_V_UF + 0) /* SN 699 or above */\r | |
61 | #define UNIT_SN699 (1 << UNIT_V_SN699)\r | |
62 | \r | |
63 | DEVICE tsc_dev;\r | |
64 | int32 tsc (int32 IR, int32 AC);\r | |
65 | t_stat tsc_reset (DEVICE *dptr);\r | |
66 | \r | |
67 | /* TSC data structures\r | |
68 | \r | |
69 | tsc_dev TSC device descriptor\r | |
70 | tsc_unit TSC unit descriptor\r | |
71 | tsc_reg TSC register list\r | |
72 | */\r | |
73 | \r | |
74 | DIB tsc_dib = { DEV_TSC, 1, { &tsc } };\r | |
75 | \r | |
76 | UNIT tsc_unit = { UDATA (NULL, UNIT_SN699, 0) };\r | |
77 | \r | |
78 | REG tsc_reg[] = {\r | |
79 | { ORDATA (IR, tsc_ir, 12) },\r | |
80 | { ORDATA (PC, tsc_pc, 12) },\r | |
81 | { FLDATA (CDF, tsc_cdf, 0) },\r | |
82 | { FLDATA (ENB, tsc_enb, 0) },\r | |
83 | { FLDATA (INT, int_req, INT_V_TSC) },\r | |
84 | { NULL }\r | |
85 | };\r | |
86 | \r | |
87 | MTAB tsc_mod[] = {\r | |
88 | { UNIT_SN699, UNIT_SN699, "ESME", "ESME", NULL },\r | |
89 | { UNIT_SN699, 0, "no ESME", "NOESME", NULL },\r | |
90 | { 0 }\r | |
91 | };\r | |
92 | \r | |
93 | DEVICE tsc_dev = {\r | |
94 | "TSC", &tsc_unit, tsc_reg, tsc_mod,\r | |
95 | 1, 10, 31, 1, 8, 8,\r | |
96 | NULL, NULL, &tsc_reset,\r | |
97 | NULL, NULL, NULL,\r | |
98 | &tsc_dib, DEV_DISABLE | DEV_DIS\r | |
99 | };\r | |
100 | \r | |
101 | /* IOT routine */\r | |
102 | \r | |
103 | int32 tsc (int32 IR, int32 AC)\r | |
104 | {\r | |
105 | switch (IR & 07) { /* decode IR<9:11> */\r | |
106 | \r | |
107 | case 0: /* ETDS */\r | |
108 | tsc_enb = 0; /* disable int req */\r | |
109 | int_req = int_req & ~INT_TSC; /* clear flag */\r | |
110 | break;\r | |
111 | \r | |
112 | case 1: /* ESKP */\r | |
113 | return (int_req & INT_TSC)? IOT_SKP + AC: AC; /* skip on int req */\r | |
114 | \r | |
115 | case 2: /* ECTF */\r | |
116 | int_req = int_req & ~INT_TSC; /* clear int req */\r | |
117 | break;\r | |
118 | \r | |
119 | case 3: /* ECDF */\r | |
120 | AC = AC | ((tsc_ir >> 3) & 07); /* read "ERIOT"<6:8> */\r | |
121 | if (tsc_cdf) AC = AC | IOT_SKP; /* if cdf, skip */\r | |
122 | tsc_cdf = 0;\r | |
123 | break;\r | |
124 | \r | |
125 | case 4: /* ERTB */\r | |
126 | return tsc_pc;\r | |
127 | \r | |
128 | case 5: /* ESME */\r | |
129 | if (tsc_unit.flags & UNIT_SN699) { /* enabled? */\r | |
130 | if (tsc_cdf && ((tsc_ir & 070) >> 3) == (SF & 07)) {\r | |
131 | AC = AC | IOT_SKP;\r | |
132 | tsc_cdf = 0;\r | |
133 | }\r | |
134 | }\r | |
135 | break;\r | |
136 | \r | |
137 | case 6: /* ERIOT */\r | |
138 | return tsc_ir;\r | |
139 | \r | |
140 | case 7: /* ETEN */\r | |
141 | tsc_enb = 1;\r | |
142 | break;\r | |
143 | } /* end switch */\r | |
144 | \r | |
145 | return AC;\r | |
146 | }\r | |
147 | \r | |
148 | /* Reset routine */\r | |
149 | \r | |
150 | t_stat tsc_reset (DEVICE *dptr)\r | |
151 | {\r | |
152 | tsc_ir = 0;\r | |
153 | tsc_pc = 0;\r | |
154 | tsc_cdf = 0;\r | |
155 | tsc_enb = 0;\r | |
156 | int_req = int_req & ~INT_TSC;\r | |
157 | return SCPE_OK;\r | |
158 | }\r |