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PDP11: report RK05 drive presence more reasonably. Add historical information in RK help.

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This commit is contained in:
Mark Pizzolato 2013-09-07 14:08:23 -07:00
parent da227959de
commit 4387c5bc6d
1 changed files with 45 additions and 14 deletions
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45
PDP11/pdp11_rk.c
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@ -421,19 +421,20 @@ UNIT *uptr;
switch ((PA >> 1) & 07) { /* decode PA<3:1> */
case 0: /* RKDS: read only */
rkds = (rkds & RKDS_ID) | RKDS_SC_OK |
(rand () % RK_NUMSC); /* random sector */
rkds = rkds & RKDS_ID; /* identified unit */
uptr = rk_dev.units + GET_DRIVE (rkda); /* selected unit */
if (!(uptr->flags & UNIT_DIS)) /* enabled? */
rkds = rkds | RKDS_RK05;
if (!(uptr->flags & UNIT_DIS)) { /* not disabled? */
rkds = rkds | RKDS_RK05 | RKDS_SC_OK | /* random sector */
(rand () % RK_NUMSC);
if (uptr->flags & UNIT_ATT) /* attached? */
rkds = rkds | RKDS_RDY;
if (!sim_is_active (uptr)) /* idle? */
rkds = rkds | RKDS_RWS;
if (uptr->flags & UNIT_WPRT)
if (uptr->flags & UNIT_WPRT) /* write locked? */
rkds = rkds | RKDS_WLK;
if (GET_SECT (rkda) == (rkds & RKDS_SC))
rkds = rkds | RKDS_ON_SC;
}
*data = rkds;
break;
@ -907,8 +908,38 @@ return SCPE_OK;
t_stat rk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
{
fprintf (st, "RK11/RKV11 cartridge disk (RK05) controller (RK)\n\n");
fprintf (st, "Options include the ability to set units write enabled or write locked,\n");
const char *const text =
/*567901234567890123456789012345678901234567890123456789012345678901234567890*/
" RK11/RKV11 cartridge disk (RK05) controller (RK)\n"
"\n"
" This simulation only simulates the RK05 disk drive.\n"
" After 1973, you couldn't have an RK02 in a system. Except for an early\n"
" version of DOS11, no PDP11 operating system supported it.\n"
"\n"
" DEC did two versions of the RK11 controller for the PDP11: the RK11-C and\n"
" the RK11-D (There's also a -E for the PDP-15.). The -C is described in\n"
" the 1972 PDP11 Peripherals handbook. In that controller, RKDS<11>\n"
" distinguishes an RK02 (low density, 128 words/sector) drive from an RK03\n"
" (high density, 256 words/drive).\n"
"\n"
" By 1973, the RK11-C had been superseded by the RK11-D. The RK11-D only\n"
" supports high density drives: the RK03 Diablo drive, and the RK05 DEC\n"
" drive. In the RK11-D, RKDS<11> distinguishes between an RK03 (Diablo)\n"
" and an RK05 (DEC) drive.\n"
/*567901234567890123456789012345678901234567890123456789012345678901234567890*/
"\n"
" From the point of view of software, the RK03/RK05 distinction is cosmetic.\n"
" At the hardware level, RK05s had to be daisy-chained in front of RK03s,\n"
" because RK03s did not receive/propagate the power fail signals. Daisy-chain\n"
" order is different than unit-number order and cannot be detected from\n"
" software.\n"
"\n"
" There is no known way to test an RK11-C, as none of the existing software\n"
" sets support it. RT, RSTS/E, and M/M+ were all released after the RK11-D\n"
" and do not support the RK11-C.\n"
"\n"
" Options include the ability to set units write enabled or write locked.\n";
fprintf (st, "%s", text);
fprint_set_help (st, dptr);
fprint_show_help (st, dptr);
fprintf (st, "\nThe RK11 supports the BOOT command. The RK11 is disabled in a Qbus\n");