[simh.git] / SDS / sds_rad.c

/* sds_rad.c: SDS 940 fixed head disk simulator\r
\r
   Copyright (c) 2001-2005, Robert M. Supnik\r
\r
   Permission is hereby granted, free of charge, to any person obtaining a\r
   copy of this software and associated documentation files (the "Software"),\r
   to deal in the Software without restriction, including without limitation\r
   the rights to use, copy, modify, merge, publish, distribute, sublicense,\r
   and/or sell copies of the Software, and to permit persons to whom the\r
   Software is furnished to do so, subject to the following conditions:\r
\r
   The above copyright notice and this permission notice shall be included in\r
   all copies or substantial portions of the Software.\r
\r
   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\r
   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\r
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL\r
   ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER\r
   IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN\r
   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\r
\r
   Except as contained in this notice, the name of Robert M Supnik shall not be\r
   used in advertising or otherwise to promote the sale, use or other dealings\r
   in this Software without prior written authorization from Robert M Supnik.\r
\r
   rad          fixed head disk\r
\r
   The fixed head disk is a head-per-track disk, with up to four disks.  Each\r
   disk is divided into two logical units.  Reads and writes cannot cross logical\r
   unit boundaries.  The fixed head disk transfers 12b characters, rather than 6b\r
   characters.  To minimize overhead, the disk is buffered in memory.\r
*/\r
\r
#include "sds_defs.h"\r
#include <math.h>\r
\r
/* Constants */\r
\r
#define RAD_NUMWD       64                              /* words/sector */\r
#define RAD_NUMSC       64                              /* sectors/track */\r
#define RAD_NUMTR       64                              /* tracks/log unit */\r
#define RAD_NUMLU       8                               /* log units/ctrl */\r
#define RAD_SCSIZE      (RAD_NUMLU*RAD_NUMTR*RAD_NUMSC) /* sectors/disk */\r
#define RAD_AMASK       (RAD_SCSIZE - 1)                /* sec addr mask */\r
#define RAD_SIZE        (RAD_SCSIZE * RAD_NUMWD)        /* words/disk */\r
#define RAD_GETLUN(x)   ((x) / (RAD_NUMTR * RAD_NUMSC))\r
#define RAD_SCMASK      (RAD_NUMSC - 1)                 /* sector mask */\r
#define RAD_TRSCMASK    ((RAD_NUMSC * RAD_NUMTR) - 1)   /* track/sec mask */\r
\r
#define GET_SECTOR(x)   ((int) fmod (sim_gtime() / ((double) (x)), \\r
                        ((double) RAD_NUMSC)))\r
\r
extern uint32 xfr_req;\r
extern uint32 alert;\r
extern int32 stop_invins, stop_invdev, stop_inviop;\r
int32 rad_err = 0;                                      /* error */\r
int32 rad_nobi = 0;                                     /* !incr x track */\r
int32 rad_da = 0;                                       /* disk address */\r
int32 rad_sba = 0;                                      /* sec byte addr */\r
int32 rad_wrp = 0;                                      /* write prot */\r
int32 rad_time = 2;                                     /* time per 12b */\r
int32 rad_stopioe = 1;                                  /* stop on error */\r
DSPT rad_tplt[] = {                                     /* template */\r
    { 1, 0 },\r
    { 1, DEV_OUT },\r
    { 0, 0 }\r
    };\r
\r
DEVICE rad_dev;\r
t_stat rad_svc (UNIT *uptr);\r
t_stat rad_reset (DEVICE *dptr);\r
t_stat rad_fill (int32 sba);\r
void rad_end_op (int32 fl);\r
int32 rad_adjda (int32 sba, int32 inc);\r
t_stat rad (uint32 fnc, uint32 inst, uint32 *dat);\r
\r
/* RAD data structures\r
\r
   rad_dev      device descriptor\r
   rad_unit     unit descriptor\r
   rad_reg      register list\r
*/\r
\r
DIB rad_dib = { CHAN_E, DEV_RAD, XFR_RAD, rad_tplt, &rad };\r
\r
UNIT rad_unit = {\r
    UDATA (&rad_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+UNIT_MUSTBUF,\r
           RAD_SIZE)\r
    };\r
\r
REG rad_reg[] = {\r
    { ORDATA (DA, rad_da, 15) },\r
    { GRDATA (SA, rad_sba, 8, 6, 1) },\r
    { FLDATA (BP, rad_sba, 0) },\r
    { FLDATA (XFR, xfr_req, XFR_V_RAD) },\r
    { FLDATA (NOBD, rad_nobi, 0) },\r
    { FLDATA (ERR, rad_err, 0) },\r
    { ORDATA (PROT, rad_wrp, 8) },\r
    { DRDATA (TIME, rad_time, 24), REG_NZ + PV_LEFT },\r
    { FLDATA (STOP_IOE, rad_stopioe, 0) },\r
    { NULL }\r
    };\r
\r
MTAB rad_mod[] = {\r
    { MTAB_XTD|MTAB_VDV, 0, "CHANNEL", "CHANNEL",\r
      &set_chan, &show_chan, NULL },\r
    { 0 }\r
    };\r
\r
DEVICE rad_dev = {\r
    "RAD", &rad_unit, rad_reg, rad_mod,\r
    1, 8, 21, 1, 8, 24,\r
    NULL, NULL, &rad_reset,\r
    NULL, NULL, NULL,\r
    &rad_dib, DEV_DISABLE\r
    };\r
\r
/* Fixed head disk routine\r
        \r
   conn -       inst = EOM0, dat = NULL\r
   eom1 -       inst = EOM1, dat = NULL\r
   sks -        inst = SKS, dat = ptr to result\r
   disc -       inst = device number, dat = NULL\r
   wreor -      inst = device number, dat = NULL\r
   read -       inst = device number, dat = ptr to data\r
   write -      inst = device number, dat = ptr to result\r
*/\r
\r
t_stat rad (uint32 fnc, uint32 inst, uint32 *dat)\r
{\r
int32 t, lun, new_ch;\r
uint32 p;\r
uint32 *fbuf = rad_unit.filebuf;\r
\r
switch (fnc) {                                          /* case function */\r
\r
    case IO_CONN:                                       /* connect */\r
        new_ch = I_GETEOCH (inst);                      /* get new chan */\r
        if (new_ch != rad_dib.chan) return SCPE_IERR;   /* wrong chan? */\r
        if (CHC_GETCPW (inst) > 1) return STOP_INVIOP;  /* 1-2 char/word? */\r
        if (sim_is_active (&rad_unit) || (alert == POT_RADA)) /* protocol viol? */\r
            return STOP_INVIOP;\r
        rad_err = 0;                                    /* clr error */\r
        rad_sba = 0;                                    /* clr sec bptr */\r
        chan_set_flag (rad_dib.chan, CHF_12B);          /* 12B mode */\r
        t = (rad_da & RAD_SCMASK) - GET_SECTOR (rad_time * RAD_NUMWD);\r
        if (t <= 0) t = t + RAD_NUMSC;                  /* seek */\r
        sim_activate (&rad_unit, t * rad_time * (RAD_NUMWD / 2));\r
        xfr_req = xfr_req & ~XFR_RAD;                   /* clr xfr flg */\r
        break;\r
\r
    case IO_EOM1:                                       /* EOM mode 1 */\r
        new_ch = I_GETEOCH (inst);                      /* get new chan */\r
        if (new_ch != rad_dib.chan) return SCPE_IERR;   /* wrong chan? */\r
        if ((inst & 00600) == 00200) alert = POT_RADS;  /* alert for sec */     \r
        else if ((inst & 06600) == 0) {                 /* alert for addr */\r
            if (sim_is_active (&rad_unit)) rad_err = 1; /* busy? */\r
            else {\r
                rad_nobi = (inst & 01000)? 1: 0;        /* save inc type */\r
                alert = POT_RADA;                       /* set alert */\r
                }\r
            }\r
        break;\r
\r
    case IO_DISC:                                       /* disconnect */\r
        rad_end_op (0);                                 /* normal term */\r
        if (inst & DEV_OUT) return rad_fill (rad_sba);  /* fill write */\r
        break;\r
\r
    case IO_WREOR:                                      /* write eor */\r
        rad_end_op (CHF_EOR);                           /* eor term */\r
        return rad_fill (rad_sba);                      /* fill write */\r
\r
    case IO_SKS:                                        /* SKS */\r
        new_ch = I_GETSKCH (inst);                      /* sks chan */\r
        if (new_ch != rad_dib.chan) return SCPE_IERR;   /* wrong chan? */\r
        t = I_GETSKCND (inst);                          /* sks cond */\r
        lun = RAD_GETLUN (rad_da);\r
        if (((t == 000) && !sim_is_active (&rad_unit)) || /* 10026: ready */\r
            ((t == 004) && !rad_err) ||                 /* 11026: !err */\r
            ((t == 014) && !(rad_wrp & (1 << lun))))    /* 13026: !wrprot */\r
            *dat = 1;\r
        break;\r
\r
    case IO_READ:                                       /* read */\r
        p = (rad_da * RAD_NUMWD) + (rad_sba >> 1);      /* buf wd addr */\r
        xfr_req = xfr_req & ~XFR_RAD;                   /* clr xfr req */\r
        if ((rad_unit.flags & UNIT_BUF) == 0) {         /* not buffered? */\r
            rad_end_op (CHF_ERR | CHF_EOR);             /* set rad err */\r
            CRETIOE (rad_stopioe, SCPE_UNATT);\r
            }\r
        if (p >= rad_unit.capac) {                      /* end of disk? */\r
            rad_end_op (CHF_ERR | CHF_EOR);             /* set rad err */\r
            return SCPE_OK;\r
            }\r
        if (rad_sba & 1) *dat = fbuf[p] & 07777;        /* odd byte? */\r
        else *dat = (fbuf[p] >> 12) & 07777;            /* even */\r
        rad_sba = rad_adjda (rad_sba, 1);               /* next byte */\r
        break;\r
\r
    case IO_WRITE:\r
        p = (rad_da * RAD_NUMWD) + (rad_sba >> 1);\r
        xfr_req = xfr_req & ~XFR_RAD;                   /* clr xfr req */\r
        if ((rad_unit.flags & UNIT_BUF) == 0) {         /* not buffered? */\r
            rad_end_op (CHF_ERR | CHF_EOR);             /* set rad err */\r
            CRETIOE (rad_stopioe, SCPE_UNATT);\r
            }\r
        if ((p >= rad_unit.capac) ||                    /* end of disk? */\r
            (rad_wrp & (1 << RAD_GETLUN (rad_da)))) {   /* write prot? */\r
            rad_end_op (CHF_ERR | CHF_EOR);             /* set rad err */\r
            return SCPE_OK;\r
            }\r
        if (rad_sba & 1) fbuf[p] = fbuf[p] | (*dat & 07777); /* odd byte? */\r
        else fbuf[p] = (*dat & 07777) << 12;            /* even */\r
        if (p >= rad_unit.hwmark) rad_unit.hwmark = p + 1; /* mark hiwater */\r
        rad_sba = rad_adjda (rad_sba, 1);               /* next byte */\r
        break;\r
\r
    default:\r
        CRETINS;\r
        }\r
\r
return SCPE_OK;\r
}\r
\r
/* PIN routine */\r
\r
t_stat pin_rads (uint32 num, uint32 *dat)\r
{\r
*dat = GET_SECTOR (rad_time * RAD_NUMWD);               /* ret curr sec */\r
return SCPE_OK;\r
}\r
\r
/* POT routine */\r
\r
t_stat pot_rada (uint32 num, uint32 *dat)\r
{\r
rad_da = (*dat) & RAD_AMASK;                            /* save dsk addr */\r
return SCPE_OK;\r
}\r
\r
/* Unit service and read/write */\r
\r
t_stat rad_svc (UNIT *uptr)\r
{\r
xfr_req = xfr_req | XFR_RAD;                            /* set xfr req */\r
sim_activate (&rad_unit, rad_time);                     /* activate */\r
return SCPE_OK;\r
}\r
\r
/* Fill incomplete sector */\r
\r
t_stat rad_fill (int32 sba)\r
{\r
uint32 p = rad_da * RAD_NUMWD;\r
uint32 *fbuf = rad_unit.filebuf;\r
int32 wa = (sba + 1) >> 1;                              /* whole words */\r
\r
if (sba && (p < rad_unit.capac)) {                      /* fill needed? */\r
    for ( ; wa < RAD_NUMWD; wa++) fbuf[p + wa] = 0;\r
    if ((p + wa) >= rad_unit.hwmark) rad_unit.hwmark = p + wa + 1;\r
    rad_adjda (sba, RAD_NUMWD - 1);                     /* inc da */\r
    }\r
return SCPE_OK;\r
}\r
\r
/* Adjust disk address */\r
\r
int32 rad_adjda (int32 sba, int32 inc)\r
{\r
sba = sba + inc;\r
if (rad_sba >= (RAD_NUMWD * 2)) {                       /* next sector? */\r
    if (rad_nobi) rad_da = (rad_da & ~RAD_SCMASK) +     /* within band? */\r
        ((rad_da + 1) & RAD_SCMASK);\r
    else rad_da = (rad_da & ~RAD_TRSCMASK) +            /* cross band */\r
        ((rad_da + 1) & RAD_TRSCMASK);\r
    sba = 0;                                            /* start new sec */\r
    }\r
return sba;\r
}\r
\r
/* Terminate disk operation */\r
\r
void rad_end_op (int32 fl)\r
{\r
if (fl) chan_set_flag (rad_dib.chan, fl);               /* set flags */\r
xfr_req = xfr_req & ~XFR_RAD;                           /* clear xfr */\r
sim_cancel (&rad_unit);                                 /* stop */\r
if (fl & CHF_ERR) {                                     /* error? */\r
    chan_disc (rad_dib.chan);                           /* disconnect */\r
    rad_err = 1;                                        /* set rad err */\r
    }\r
return;\r
}\r
\r
/* Reset routine */\r
\r
t_stat rad_reset (DEVICE *dptr)\r
{\r
chan_disc (rad_dib.chan);                               /* disconnect */\r
rad_nobi = 0;                                           /* clear state */\r
rad_da = 0;\r
rad_sba = 0;\r
xfr_req = xfr_req & ~XFR_RAD;                           /* clr xfr req */\r
sim_cancel (&rad_unit);                                 /* deactivate */\r
return SCPE_OK;\r
}\r
Commit	Line	Data
196ba1fc PH	1	/* sds_rad.c: SDS 940 fixed head disk simulator\r
	2	\r
	3	Copyright (c) 2001-2005, 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	rad fixed head disk\r
	27	\r
	28	The fixed head disk is a head-per-track disk, with up to four disks. Each\r
	29	disk is divided into two logical units. Reads and writes cannot cross logical\r
	30	unit boundaries. The fixed head disk transfers 12b characters, rather than 6b\r
	31	characters. To minimize overhead, the disk is buffered in memory.\r
	32	*/\r
	33	\r
	34	#include "sds_defs.h"\r
	35	#include <math.h>\r
	36	\r
	37	/* Constants */\r
	38	\r
	39	#define RAD_NUMWD 64 /* words/sector */\r
	40	#define RAD_NUMSC 64 /* sectors/track */\r
	41	#define RAD_NUMTR 64 /* tracks/log unit */\r
	42	#define RAD_NUMLU 8 /* log units/ctrl */\r
	43	#define RAD_SCSIZE (RAD_NUMLURAD_NUMTRRAD_NUMSC) /* sectors/disk */\r
	44	#define RAD_AMASK (RAD_SCSIZE - 1) /* sec addr mask */\r
	45	#define RAD_SIZE (RAD_SCSIZE * RAD_NUMWD) /* words/disk */\r
	46	#define RAD_GETLUN(x) ((x) / (RAD_NUMTR * RAD_NUMSC))\r
	47	#define RAD_SCMASK (RAD_NUMSC - 1) /* sector mask */\r
	48	#define RAD_TRSCMASK ((RAD_NUMSC * RAD_NUMTR) - 1) /* track/sec mask */\r
	49	\r
	50	#define GET_SECTOR(x) ((int) fmod (sim_gtime() / ((double) (x)), \\r
	51	((double) RAD_NUMSC)))\r
	52	\r
	53	extern uint32 xfr_req;\r
	54	extern uint32 alert;\r
	55	extern int32 stop_invins, stop_invdev, stop_inviop;\r
	56	int32 rad_err = 0; /* error */\r
	57	int32 rad_nobi = 0; /* !incr x track */\r
	58	int32 rad_da = 0; /* disk address */\r
	59	int32 rad_sba = 0; /* sec byte addr */\r
	60	int32 rad_wrp = 0; /* write prot */\r
	61	int32 rad_time = 2; /* time per 12b */\r
	62	int32 rad_stopioe = 1; /* stop on error */\r
	63	DSPT rad_tplt[] = { /* template */\r
	64	{ 1, 0 },\r
65	{ 1, DEV_OUT },\r
66	{ 0, 0 }\r
67	};\r
68	\r
69	DEVICE rad_dev;\r
70	t_stat rad_svc (UNIT *uptr);\r
71	t_stat rad_reset (DEVICE *dptr);\r
72	t_stat rad_fill (int32 sba);\r
73	void rad_end_op (int32 fl);\r
74	int32 rad_adjda (int32 sba, int32 inc);\r
75	t_stat rad (uint32 fnc, uint32 inst, uint32 *dat);\r
76	\r
77	/* RAD data structures\r
78	\r
79	rad_dev device descriptor\r
80	rad_unit unit descriptor\r
81	rad_reg register list\r
82	*/\r
83	\r
84	DIB rad_dib = { CHAN_E, DEV_RAD, XFR_RAD, rad_tplt, &rad };\r
85	\r
86	UNIT rad_unit = {\r
87	UDATA (&rad_svc, UNIT_FIX+UNIT_ATTABLE+UNIT_BUFABLE+UNIT_MUSTBUF,\r
88	RAD_SIZE)\r
89	};\r
90	\r
91	REG rad_reg[] = {\r
92	{ ORDATA (DA, rad_da, 15) },\r
93	{ GRDATA (SA, rad_sba, 8, 6, 1) },\r
94	{ FLDATA (BP, rad_sba, 0) },\r
95	{ FLDATA (XFR, xfr_req, XFR_V_RAD) },\r
96	{ FLDATA (NOBD, rad_nobi, 0) },\r
97	{ FLDATA (ERR, rad_err, 0) },\r
98	{ ORDATA (PROT, rad_wrp, 8) },\r
99	{ DRDATA (TIME, rad_time, 24), REG_NZ + PV_LEFT },\r
100	{ FLDATA (STOP_IOE, rad_stopioe, 0) },\r
101	{ NULL }\r
102	};\r
103	\r
104	MTAB rad_mod[] = {\r
105	{ MTAB_XTD\|MTAB_VDV, 0, "CHANNEL", "CHANNEL",\r
106	&set_chan, &show_chan, NULL },\r
107	{ 0 }\r
108	};\r
109	\r
110	DEVICE rad_dev = {\r
111	"RAD", &rad_unit, rad_reg, rad_mod,\r
112	1, 8, 21, 1, 8, 24,\r
113	NULL, NULL, &rad_reset,\r
114	NULL, NULL, NULL,\r
115	&rad_dib, DEV_DISABLE\r
116	};\r
117	\r
118	/* Fixed head disk routine\r
119	\r
120	conn - inst = EOM0, dat = NULL\r
121	eom1 - inst = EOM1, dat = NULL\r
122	sks - inst = SKS, dat = ptr to result\r
123	disc - inst = device number, dat = NULL\r
124	wreor - inst = device number, dat = NULL\r
125	read - inst = device number, dat = ptr to data\r
126	write - inst = device number, dat = ptr to result\r
127	*/\r
128	\r
129	t_stat rad (uint32 fnc, uint32 inst, uint32 *dat)\r
130	{\r
131	int32 t, lun, new_ch;\r
132	uint32 p;\r
133	uint32 *fbuf = rad_unit.filebuf;\r
134	\r
135	switch (fnc) { /* case function */\r
136	\r
137	case IO_CONN: /* connect */\r
138	new_ch = I_GETEOCH (inst); /* get new chan */\r
139	if (new_ch != rad_dib.chan) return SCPE_IERR; /* wrong chan? */\r
140	if (CHC_GETCPW (inst) > 1) return STOP_INVIOP; /* 1-2 char/word? */\r
141	if (sim_is_active (&rad_unit) \|\| (alert == POT_RADA)) /* protocol viol? */\r
142	return STOP_INVIOP;\r
143	rad_err = 0; /* clr error */\r
144	rad_sba = 0; /* clr sec bptr */\r
145	chan_set_flag (rad_dib.chan, CHF_12B); /* 12B mode */\r
146	t = (rad_da & RAD_SCMASK) - GET_SECTOR (rad_time * RAD_NUMWD);\r
147	if (t <= 0) t = t + RAD_NUMSC; /* seek */\r
148	sim_activate (&rad_unit, t * rad_time * (RAD_NUMWD / 2));\r
149	xfr_req = xfr_req & ~XFR_RAD; /* clr xfr flg */\r
150	break;\r
151	\r
152	case IO_EOM1: /* EOM mode 1 */\r
153	new_ch = I_GETEOCH (inst); /* get new chan */\r
154	if (new_ch != rad_dib.chan) return SCPE_IERR; /* wrong chan? */\r
155	if ((inst & 00600) == 00200) alert = POT_RADS; /* alert for sec */ \r
156	else if ((inst & 06600) == 0) { /* alert for addr */\r
157	if (sim_is_active (&rad_unit)) rad_err = 1; /* busy? */\r
158	else {\r
159	rad_nobi = (inst & 01000)? 1: 0; /* save inc type */\r
160	alert = POT_RADA; /* set alert */\r
161	}\r
162	}\r
163	break;\r
164	\r
165	case IO_DISC: /* disconnect */\r
166	rad_end_op (0); /* normal term */\r
167	if (inst & DEV_OUT) return rad_fill (rad_sba); /* fill write */\r
168	break;\r
169	\r
170	case IO_WREOR: /* write eor */\r
171	rad_end_op (CHF_EOR); /* eor term */\r
172	return rad_fill (rad_sba); /* fill write */\r
173	\r
174	case IO_SKS: /* SKS */\r
175	new_ch = I_GETSKCH (inst); /* sks chan */\r
176	if (new_ch != rad_dib.chan) return SCPE_IERR; /* wrong chan? */\r
177	t = I_GETSKCND (inst); /* sks cond */\r
178	lun = RAD_GETLUN (rad_da);\r
179	if (((t == 000) && !sim_is_active (&rad_unit)) \|\| /* 10026: ready */\r
180	((t == 004) && !rad_err) \|\| /* 11026: !err */\r
181	((t == 014) && !(rad_wrp & (1 << lun)))) /* 13026: !wrprot */\r
182	*dat = 1;\r
183	break;\r
184	\r
185	case IO_READ: /* read */\r
186	p = (rad_da * RAD_NUMWD) + (rad_sba >> 1); /* buf wd addr */\r
187	xfr_req = xfr_req & ~XFR_RAD; /* clr xfr req */\r
188	if ((rad_unit.flags & UNIT_BUF) == 0) { /* not buffered? */\r
189	rad_end_op (CHF_ERR \| CHF_EOR); /* set rad err */\r
190	CRETIOE (rad_stopioe, SCPE_UNATT);\r
191	}\r
192	if (p >= rad_unit.capac) { /* end of disk? */\r
193	rad_end_op (CHF_ERR \| CHF_EOR); /* set rad err */\r
194	return SCPE_OK;\r
195	}\r
196	if (rad_sba & 1) dat = fbuf[p] & 07777; / odd byte? */\r
197	else dat = (fbuf[p] >> 12) & 07777; / even */\r
198	rad_sba = rad_adjda (rad_sba, 1); /* next byte */\r
199	break;\r
200	\r
201	case IO_WRITE:\r
202	p = (rad_da * RAD_NUMWD) + (rad_sba >> 1);\r
203	xfr_req = xfr_req & ~XFR_RAD; /* clr xfr req */\r
204	if ((rad_unit.flags & UNIT_BUF) == 0) { /* not buffered? */\r
205	rad_end_op (CHF_ERR \| CHF_EOR); /* set rad err */\r
206	CRETIOE (rad_stopioe, SCPE_UNATT);\r
207	}\r
208	if ((p >= rad_unit.capac) \|\| /* end of disk? */\r
209	(rad_wrp & (1 << RAD_GETLUN (rad_da)))) { /* write prot? */\r
210	rad_end_op (CHF_ERR \| CHF_EOR); /* set rad err */\r
211	return SCPE_OK;\r
212	}\r
213	if (rad_sba & 1) fbuf[p] = fbuf[p] \| (dat & 07777); / odd byte? */\r
214	else fbuf[p] = (dat & 07777) << 12; / even */\r
215	if (p >= rad_unit.hwmark) rad_unit.hwmark = p + 1; /* mark hiwater */\r
216	rad_sba = rad_adjda (rad_sba, 1); /* next byte */\r
217	break;\r
218	\r
219	default:\r
220	CRETINS;\r
221	}\r
222	\r
223	return SCPE_OK;\r
224	}\r
225	\r
226	/* PIN routine */\r
227	\r
228	t_stat pin_rads (uint32 num, uint32 *dat)\r
229	{\r
230	dat = GET_SECTOR (rad_time RAD_NUMWD); /* ret curr sec */\r
231	return SCPE_OK;\r
232	}\r
233	\r
234	/* POT routine */\r
235	\r
236	t_stat pot_rada (uint32 num, uint32 *dat)\r
237	{\r
238	rad_da = (dat) & RAD_AMASK; / save dsk addr */\r
239	return SCPE_OK;\r
240	}\r
241	\r
242	/* Unit service and read/write */\r
243	\r
244	t_stat rad_svc (UNIT *uptr)\r
245	{\r
246	xfr_req = xfr_req \| XFR_RAD; /* set xfr req */\r
247	sim_activate (&rad_unit, rad_time); /* activate */\r
248	return SCPE_OK;\r
249	}\r
250	\r
251	/* Fill incomplete sector */\r
252	\r
253	t_stat rad_fill (int32 sba)\r
254	{\r
255	uint32 p = rad_da * RAD_NUMWD;\r
256	uint32 *fbuf = rad_unit.filebuf;\r
257	int32 wa = (sba + 1) >> 1; /* whole words */\r
258	\r
259	if (sba && (p < rad_unit.capac)) { /* fill needed? */\r
260	for ( ; wa < RAD_NUMWD; wa++) fbuf[p + wa] = 0;\r
261	if ((p + wa) >= rad_unit.hwmark) rad_unit.hwmark = p + wa + 1;\r
262	rad_adjda (sba, RAD_NUMWD - 1); /* inc da */\r
263	}\r
264	return SCPE_OK;\r
265	}\r
266	\r
267	/* Adjust disk address */\r
268	\r
269	int32 rad_adjda (int32 sba, int32 inc)\r
270	{\r
271	sba = sba + inc;\r
272	if (rad_sba >= (RAD_NUMWD * 2)) { /* next sector? */\r
273	if (rad_nobi) rad_da = (rad_da & ~RAD_SCMASK) + /* within band? */\r
274	((rad_da + 1) & RAD_SCMASK);\r
275	else rad_da = (rad_da & ~RAD_TRSCMASK) + /* cross band */\r
276	((rad_da + 1) & RAD_TRSCMASK);\r
277	sba = 0; /* start new sec */\r
278	}\r
279	return sba;\r
280	}\r
281	\r
282	/* Terminate disk operation */\r
283	\r
284	void rad_end_op (int32 fl)\r
285	{\r
286	if (fl) chan_set_flag (rad_dib.chan, fl); /* set flags */\r
287	xfr_req = xfr_req & ~XFR_RAD; /* clear xfr */\r
288	sim_cancel (&rad_unit); /* stop */\r
289	if (fl & CHF_ERR) { /* error? */\r
290	chan_disc (rad_dib.chan); /* disconnect */\r
291	rad_err = 1; /* set rad err */\r
292	}\r
293	return;\r
294	}\r
295	\r
296	/* Reset routine */\r
297	\r
298	t_stat rad_reset (DEVICE *dptr)\r
299	{\r
300	chan_disc (rad_dib.chan); /* disconnect */\r
301	rad_nobi = 0; /* clear state */\r
302	rad_da = 0;\r
303	rad_sba = 0;\r
304	xfr_req = xfr_req & ~XFR_RAD; /* clr xfr req */\r
305	sim_cancel (&rad_unit); /* deactivate */\r
306	return SCPE_OK;\r
307	}\r