| /* b5500_dk.c: Burrioughs 5500 Disk controller | |
| Copyright (c) 2016, Richard Cornwell | |
| Permission is hereby granted, free of charge, to any person obtaining a | |
| copy of this software and associated documentation files (the "Software"), | |
| to deal in the Software without restriction, including without limitation | |
| the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
| and/or sell copies of the Software, and to permit persons to whom the | |
| Software is furnished to do so, subject to the following conditions: | |
| The above copyright notice and this permission notice shall be included in | |
| all copies or substantial portions of the Software. | |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
| RICHARD CORNWELL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER | |
| IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
| CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| */ | |
| #include "b5500_defs.h" | |
| #if (NUM_DEVS_DSK > 0) | |
| /* in u3 is device address */ | |
| /* in u4 is current buffer position */ | |
| /* in u5 Bits 30-16 of W */ | |
| #define URCSTA_SKIP 000017 /* Skip mask */ | |
| #define URCSTA_SINGLE 000020 /* Single space skip. */ | |
| #define URCSTA_DOUBLE 000040 /* Double space skip */ | |
| #define URCSTA_READ 000400 /* Read flag */ | |
| #define URCSTA_WC 001000 /* Use word count */ | |
| #define URCSTA_DIRECT 002000 /* Direction, Long line */ | |
| #define URCSTA_BINARY 004000 /* Binary transfer */ | |
| #define URCSTA_INHIBIT 040000 /* Inhibit transfer to memory */ | |
| #define DK_CHAN 0000003 /* Channel number */ | |
| #define DK_CTRL 0000004 /* Disk controller unit attached too */ | |
| #define DK_WC 0000010 /* Use word count */ | |
| #define DK_BSY 0000020 /* Drive is busy. */ | |
| #define DK_RD 0000040 /* Executing a read command */ | |
| #define DK_WR 0000100 /* Executing a write command */ | |
| #define DK_RDCK 0000200 /* Executing a read check command */ | |
| #define DK_ADDR 0000400 /* Drive has an address. */ | |
| #define DK_BIN 0001000 /* Binary mode */ | |
| #define DK_WCZERO 0002000 /* Word count Zero */ | |
| #define DK_SECMASK 0770000 /* Number of segments to transfer */ | |
| #define DK_SECT 0010000 /* One segment */ | |
| #define DK_SEC_SIZE 240 /* Sector size */ | |
| #define DK_MAXSEGS 200000 /* Max segments for MOD I ESU */ | |
| #define DK_MAXSEGS2 400000 /* Max segments for MOD IB ESU */ | |
| #define DFX_V (UNIT_V_UF + 1) | |
| #define MODIB_V (UNIT_V_UF + 2) | |
| #define DFX (1 << DFX_V) | |
| #define MODIB (1 << MODIB_V) | |
| t_stat dsk_cmd(uint16, uint16, uint8, uint16 *); | |
| t_stat dsk_srv(UNIT *); | |
| t_stat dsk_boot(int32, DEVICE *); | |
| t_stat dsk_help (FILE *, DEVICE *, UNIT *, int32, const char *); | |
| const char *dsk_description (DEVICE *); | |
| t_stat esu_srv(UNIT *); | |
| t_stat esu_attach(UNIT *, CONST char *); | |
| t_stat esu_detach(UNIT *); | |
| t_stat esu_help (FILE *, DEVICE *, UNIT *, int32, const char *); | |
| const char *esu_description (DEVICE *); | |
| uint8 dsk_buffer[NUM_DEVS_DSK][DK_SEC_SIZE]; | |
| t_stat set_mod(UNIT *uptr, int32 val, CONST char *cptr, | |
| void *desc); | |
| #define ESU_TYPE UDATA(&esu_srv, UNIT_ATTABLE+UNIT_DISABLE+ \ | |
| UNIT_FIX, DK_SEC_SIZE * DK_MAXSEGS) | |
| UNIT esu_unit[] = { | |
| {ESU_TYPE, DK_MAXSEGS}, /* 0 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 1 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 2 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 3 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 4 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 5 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 6 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 7 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 8 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 9 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 10 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 11 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 12 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 13 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 14 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 15 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 16 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 17 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 18 */ | |
| {ESU_TYPE, DK_MAXSEGS}, /* 19 */ | |
| }; | |
| MTAB esu_mod[] = { | |
| {MODIB, 0, "MODI", "MODI", &set_mod, NULL, NULL, | |
| "Sets ESU to Fast Mod I drive"}, | |
| {MODIB, MODIB, "MODIB", "MODIB", &set_mod, NULL, NULL, | |
| "Sets ESU to Slow Mod IB drive"}, | |
| {0} | |
| }; | |
| DEVICE esu_dev = { | |
| "ESU", esu_unit, NULL, esu_mod, | |
| 20, 8, 15, 1, 8, 8, | |
| NULL, NULL, NULL, NULL, &esu_attach, &esu_detach, | |
| NULL, DEV_DISABLE | DEV_DEBUG, 0, dev_debug, | |
| NULL, NULL, &esu_help, NULL, NULL, &esu_description | |
| }; | |
| MTAB dsk_mod[] = { | |
| {DFX, 0, NULL, "NODFX", NULL, NULL, NULL, | |
| "Disables drive sharing, use only on DK1"}, | |
| {DFX, DFX, "DFX", "DFX", NULL, NULL, NULL, | |
| "Enables drive sharing, use only on DK1"}, | |
| {0} | |
| }; | |
| UNIT dsk_unit[] = { | |
| {UDATA(&dsk_srv, UNIT_DISABLE, 0)}, /* DKA */ | |
| {UDATA(&dsk_srv, UNIT_DIS | UNIT_DISABLE, 0)}, /* DKB */ | |
| }; | |
| DEVICE dsk_dev = { | |
| "DK", dsk_unit, NULL, dsk_mod, | |
| NUM_DEVS_DSK, 8, 15, 1, 8, 8, | |
| NULL, NULL, NULL, &dsk_boot, NULL, NULL, | |
| NULL, DEV_DISABLE | DEV_DEBUG, 0, dev_debug, | |
| NULL, NULL, &dsk_help, NULL, NULL, &dsk_description | |
| }; | |
| /* Start off a disk command */ | |
| t_stat dsk_cmd(uint16 cmd, uint16 dev, uint8 chan, uint16 *wc) | |
| { | |
| UNIT *uptr; | |
| int u = (dev==DSK1_DEV)? 0: 1; | |
| uptr = &dsk_unit[u]; | |
| /* If unit disabled return error */ | |
| if (uptr->flags & UNIT_DIS) | |
| return SCPE_NODEV; | |
| /* Check if drive is ready to recieve a command */ | |
| if ((uptr->u5 & DK_BSY)) | |
| return SCPE_BUSY; | |
| uptr->u5 = chan|DK_BSY; | |
| if (dev == DSK2_DEV) | |
| uptr->u5 |= DK_CTRL; | |
| uptr->u5 |= (cmd & 077) << 12; | |
| if (cmd & URCSTA_INHIBIT) | |
| uptr->u5 |= DK_RDCK; | |
| else if (cmd & URCSTA_READ) | |
| uptr->u5 |= DK_RD; | |
| else | |
| uptr->u5 |= DK_WR; | |
| if (cmd & URCSTA_WC) { | |
| uptr->u5 |= DK_WC; | |
| if (*wc == 0) | |
| uptr->u5 |= DK_WCZERO; | |
| } | |
| if (cmd & URCSTA_BINARY) | |
| uptr->u5 |= DK_BIN; | |
| if (loading) { | |
| uptr->u4 = 1; | |
| uptr->u3 = 0; | |
| } else { | |
| uptr->u5 |= DK_ADDR; | |
| } | |
| sim_activate(uptr, 100); | |
| return SCPE_OK; | |
| } | |
| /* Handle processing disk controller commands */ | |
| t_stat dsk_srv(UNIT * uptr) | |
| { | |
| int chan = uptr->u5 & DK_CHAN; | |
| DEVICE *dptr = find_dev_from_unit(uptr); | |
| int i; | |
| int addr; | |
| uint8 abuf[8]; /* x-esu-disk-track-segment */ | |
| int u = uptr - dsk_unit; | |
| int esu; | |
| UNIT *eptr; | |
| if ((uptr->u5 & DK_BSY) == 0) | |
| return SCPE_OK; | |
| /* Read in first word, which a address. */ | |
| /* Note special read routine since address is not included | |
| in the word count */ | |
| if (uptr->u5 & DK_ADDR) { | |
| /* Read in 8 characters which are the address */ | |
| for (i = 0; i < 8; i++) { | |
| if (chan_read_disk(chan, &abuf[i], 0)) | |
| break; | |
| abuf[i] &= 017; /* Mask zone out */ | |
| if (abuf[i] == 012) /* Zero to zero */ | |
| abuf[i] = 0; | |
| } | |
| /* extract ESU and Address */ | |
| esu = abuf[1]; | |
| addr = 0; | |
| for (i = 2; i < 8; i++) { | |
| addr = (addr * 10) + abuf[i]; | |
| } | |
| uptr->u5 &= ~DK_ADDR; | |
| uptr->u4 = addr; | |
| /* Map to ESU */ | |
| if (u && (dsk_unit[u].flags & DFX) == 0) | |
| esu += 10; | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk access %d %s %02o %d,%d\n\r", u, | |
| (uptr->u5 & DK_RDCK) ? "rcheck" : | |
| (uptr->u5 & DK_RD) ? "read" : | |
| (uptr->u5 & DK_WR)? "write" : "nop", (uptr->u5 >> 9) & 077, | |
| esu, addr); | |
| uptr->u3 = esu; | |
| eptr = &esu_unit[uptr->u3]; | |
| /* Check if valid */ | |
| if ((eptr->flags & UNIT_DIS) || (eptr->flags & UNIT_ATT) == 0) { | |
| /* Set not ready and end channel */ | |
| chan_set_notrdy(chan); | |
| uptr->u5 = 0; | |
| return SCPE_OK; | |
| } | |
| /* Check if Read Check or Write Check */ | |
| if ((uptr->u5 & (DK_WCZERO|DK_WC|DK_SECMASK)) == (DK_WCZERO|DK_WC)) { | |
| if (uptr->u4 >= eptr->wait) | |
| chan_set_eof(chan); | |
| if (uptr->u5 & DK_WR) { | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk write int %d %d %o\n\r", | |
| uptr->u3, uptr->u4, uptr->u5); | |
| } | |
| if (uptr->u5 & DK_RD) { | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk read int %d %d %o\n\r", | |
| uptr->u3, uptr->u4, uptr->u5); | |
| if (eptr->flags & MODIB) | |
| chan_set_error(chan); | |
| } | |
| chan_set_end(chan); | |
| uptr->u5 = 0; | |
| return SCPE_OK; | |
| } | |
| sim_activate(uptr, 5000); | |
| return SCPE_OK; | |
| } | |
| /* Kick off actual transfer to ESU */ | |
| if (((uptr->u5 & DK_ADDR) == 0) && | |
| ((uptr->u5 & (DK_RDCK|DK_RD|DK_WR)) != 0)) { | |
| eptr = &esu_unit[uptr->u3]; | |
| /* Wait until unit is ready for new access */ | |
| if ((eptr->u5 & DK_BSY) == 0) { | |
| eptr->u3 = (uptr->u5 & DK_WR) ? 0 : DK_SEC_SIZE; | |
| eptr->u4 = uptr->u4; /* Disk address */ | |
| eptr->u5 = uptr->u5; /* Command */ | |
| if (uptr->u5 & DK_RDCK) { | |
| uptr->u5 = 0; | |
| chan_set_end(chan); | |
| } else | |
| uptr->u5 &= ~(DK_RDCK|DK_RD|DK_WR); | |
| sim_activate(eptr, 500); | |
| return SCPE_OK; | |
| } | |
| sim_activate(uptr, 100); | |
| } | |
| return SCPE_OK; | |
| } | |
| void esu_set_end(UNIT *uptr, int err) { | |
| int chan = uptr->u5 & DK_CHAN; | |
| int dsk = ((uptr->u5 & DK_CTRL) != 0); | |
| DEVICE *dptr = find_dev_from_unit(uptr); | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk done %d %d %o\n\r", uptr->u3, | |
| uptr->u4, uptr->u5); | |
| if (err) | |
| chan_set_error(chan); | |
| uptr->u5 = 0; | |
| dsk_unit[dsk].u5 = 0; | |
| chan_set_end(chan); | |
| } | |
| /* Handle processing esu controller commands */ | |
| t_stat esu_srv(UNIT * uptr) | |
| { | |
| int chan = uptr->u5 & DK_CHAN; | |
| DEVICE *dptr = find_dev_from_unit(uptr); | |
| int u = uptr - esu_unit; | |
| int dsk = ((uptr->u5 & DK_CTRL) != 0); | |
| int wc; | |
| /* Process for each unit */ | |
| if (uptr->u5 & DK_RD) { | |
| /* Check if at start of segment */ | |
| if (uptr->u3 >= DK_SEC_SIZE) { | |
| int da = (uptr->u4 * DK_SEC_SIZE); | |
| /* Check if end of operation */ | |
| if ((uptr->u5 & (DK_SECMASK)) == 0) { | |
| esu_set_end(uptr, 0); | |
| return SCPE_OK; | |
| } | |
| /* Check if over end of disk */ | |
| if (uptr->u4 >= uptr->wait) { | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk read over %d %d %o\n\r", | |
| uptr->u3, uptr->u4, uptr->u5); | |
| chan_set_eof(chan); | |
| esu_set_end(uptr, 0); | |
| return SCPE_OK; | |
| } | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk read %d %d %d %o %d\n\r", | |
| u,uptr->u3, uptr->u4, uptr->u5, da); | |
| if (sim_fseek(uptr->fileref, da, SEEK_SET) < 0) { | |
| esu_set_end(uptr, 1); | |
| return SCPE_OK; | |
| } | |
| wc = sim_fread(&dsk_buffer[dsk][0], 1, DK_SEC_SIZE, | |
| uptr->fileref); | |
| for (; wc < DK_SEC_SIZE; wc++) | |
| dsk_buffer[dsk][wc] = (uptr->u5 & DK_BIN) ? 0 :020; | |
| uptr->u3 = 0; | |
| uptr->u4++; /* Advance disk address */ | |
| uptr->u5 -= DK_SECT; | |
| } | |
| /* Transfer one Character */ | |
| if (chan_write_char(chan, &dsk_buffer[dsk][uptr->u3], 0)) { | |
| esu_set_end(uptr, 0); | |
| return SCPE_OK; | |
| } | |
| uptr->u3++; | |
| } | |
| if (uptr->u5 & DK_RDCK) { | |
| if (uptr->u3 >= DK_SEC_SIZE) { | |
| /* Check if over end of disk */ | |
| if (uptr->u4 >= uptr->wait) { | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk rdchk over %d %d %o\n\r", | |
| uptr->u3, uptr->u4, uptr->u5); | |
| uptr->u5 = 0; | |
| IAR |= IRQ_14 << dsk; | |
| return SCPE_OK; | |
| } | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk rdchk %d %d %d %o\n\r", u, | |
| uptr->u3, uptr->u4, uptr->u5); | |
| uptr->u4++; /* Advance disk address */ | |
| uptr->u5 -= DK_SECT; | |
| uptr->u3 = 0; | |
| /* Check if end of operation */ | |
| if ((uptr->u5 & (DK_SECMASK)) == 0) { | |
| uptr->u5 = 0; | |
| IAR |= IRQ_14 << dsk; | |
| return SCPE_OK; | |
| } | |
| } | |
| /* Check if at end of segment */ | |
| uptr->u3++; | |
| } | |
| /* Process for each unit */ | |
| if (uptr->u5 & DK_WR) { | |
| /* Check if end of operation */ | |
| if ((uptr->u5 & (DK_SECMASK)) == 0) { | |
| esu_set_end(uptr, 0); | |
| return SCPE_OK; | |
| } | |
| /* Transfer one Character */ | |
| if (chan_read_char(chan, &dsk_buffer[dsk][uptr->u3], 0)) { | |
| if (uptr->u3 != 0) { | |
| while (uptr->u3 < DK_SEC_SIZE) | |
| dsk_buffer[dsk][uptr->u3++] = (uptr->u5 & DK_BIN) ? 0 :020; | |
| } | |
| } | |
| uptr->u3++; | |
| /* Check if at end of segment */ | |
| if (uptr->u3 >= DK_SEC_SIZE) { | |
| int da = (uptr->u4 * DK_SEC_SIZE); | |
| /* Check if over end of disk */ | |
| if (uptr->u4 >= uptr->wait) { | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk write over %d %d %o\n\r", | |
| uptr->u3, uptr->u4, uptr->u5); | |
| chan_set_eof(chan); | |
| esu_set_end(uptr, 0); | |
| return SCPE_OK; | |
| } | |
| sim_debug(DEBUG_DETAIL, dptr, "Disk write %d %d %d %o %d\n\r", | |
| u, uptr->u3, uptr->u4, uptr->u5, da); | |
| if (sim_fseek(uptr->fileref, da, SEEK_SET) < 0) { | |
| esu_set_end(uptr, 1); | |
| return SCPE_OK; | |
| } | |
| wc = sim_fwrite(&dsk_buffer[dsk][0], 1, DK_SEC_SIZE, | |
| uptr->fileref); | |
| if (wc != DK_SEC_SIZE) { | |
| esu_set_end(uptr, 1); | |
| return SCPE_OK; | |
| } | |
| uptr->u3 = 0; | |
| uptr->u4++; /* Advance disk address */ | |
| uptr->u5 -= DK_SECT; | |
| } | |
| } | |
| sim_activate(uptr, (uptr->flags & MODIB) ? 200 :100); | |
| return SCPE_OK; | |
| } | |
| t_stat | |
| set_mod(UNIT *uptr, int32 val, CONST char *cptr, void *desc) { | |
| if (uptr == NULL) return SCPE_IERR; | |
| if (val == MODIB) | |
| uptr->wait = DK_MAXSEGS2; | |
| else | |
| uptr->wait = DK_MAXSEGS; | |
| uptr->capac = DK_SEC_SIZE * uptr->wait; | |
| return SCPE_OK; | |
| } | |
| /* Boot from given device */ | |
| t_stat | |
| dsk_boot(int32 unit_num, DEVICE * dptr) | |
| { | |
| int dev = (unit_num)? DSK2_DEV:DSK1_DEV; | |
| t_uint64 desc; | |
| int i; | |
| for(i = 0; i < 20; i++) | |
| esu_unit[i].u5 = 0; | |
| desc = (((t_uint64)dev)<<DEV_V)|DEV_IORD|DEV_OPT|020LL; | |
| return chan_boot(desc); | |
| } | |
| t_stat | |
| esu_attach(UNIT * uptr, CONST char *file) | |
| { | |
| t_stat r; | |
| int u = uptr-esu_unit; | |
| if ((r = attach_unit(uptr, file)) != SCPE_OK) | |
| return r; | |
| if (u < 10) { | |
| iostatus |= DSK1_FLAG; | |
| } | |
| if (u >= 10 || (dsk_unit[1].flags & DFX) != 0) { | |
| iostatus |= DSK2_FLAG; | |
| } | |
| return SCPE_OK; | |
| } | |
| t_stat | |
| esu_detach(UNIT * uptr) | |
| { | |
| t_stat r; | |
| int u = uptr-esu_unit; | |
| int i, mask, lim; | |
| if ((r = detach_unit(uptr)) != SCPE_OK) | |
| return r; | |
| /* Determine which controller */ | |
| if (u < 10) { | |
| mask = DSK1_FLAG; | |
| /* If DFX, then both controllers */ | |
| if ((dsk_unit[1].flags & DFX) != 0) | |
| mask |= DSK2_FLAG; | |
| lim = 10; | |
| i = 0; | |
| } else { | |
| /* If DFX, then drive not attached */ | |
| if ((dsk_unit[1].flags & DFX) != 0) | |
| return r; | |
| mask = DSK2_FLAG; | |
| lim = 20; | |
| i = 10; | |
| } | |
| /* Scan to see if any disks still attached */ | |
| while (i < lim) { | |
| if (esu_unit[i].flags & UNIT_ATT) | |
| return r; /* Something still there */ | |
| i++; | |
| } | |
| /* There are no longer any drives attached to | |
| this controller */ | |
| iostatus &= ~mask; | |
| return r; | |
| } | |
| t_stat | |
| dsk_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr) | |
| { | |
| fprintf (st, "B5470 Disk Controller\n\n"); | |
| fprintf (st, "By default the second disk controller is not enabled.\n\n"); | |
| fprintf (st, " sim> SET DK1 ENABLE to enable second disk controller for use\n"); | |
| fprintf (st, "The B5500 could have up to two disk controllers that could talk\n"); | |
| fprintf (st, "to up to 10 ESU. Each ESU held up to 5 storage units. By uses of\n"); | |
| fprintf (st, "a exchange unit (DFX), the second controller could talk to the\n"); | |
| fprintf (st, "same drives as the first controller. To use the second disk controller\n"); | |
| fprintf (st, "to share the same drives as the first (after enabling DK1):\n\n"); | |
| fprintf (st, " sim> SET DK1 DFX enable disk exchange\n\n"); | |
| fprintf (st, "If you want to support more then 10 ESU units you will first\n"); | |
| fprintf (st, "need to generate a new version of MCP without the DFX option\n"); | |
| fprintf (st, "for MCP XV you also need to SET DKBNODFX TRUE when building the\n"); | |
| fprintf (st, "system file.\n"); | |
| fprintf (st, "ESU units 0-9 attach to DK0, or DK1 if DFX\n"); | |
| fprintf (st, "ESU units 10-19 attach to DK1 only\n\n"); | |
| fprintf (st, "The DK unit supports the BOOT command.\n\n"); | |
| fprint_set_help (st, dptr) ; | |
| fprint_show_help (st, dptr) ; | |
| return SCPE_OK; | |
| } | |
| const char * | |
| dsk_description (DEVICE *dptr) | |
| { | |
| return "B5470 disk controller module"; | |
| } | |
| t_stat | |
| esu_help (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, const char *cptr) | |
| { | |
| fprintf (st, "B471 ESU with 5 B457 storage units\n\n"); | |
| fprintf (st, "Each ESU unit represents the electronics unit and 5 storage units\n"); | |
| fprintf (st, "MOD I units could handle about 48 million characters.\n"); | |
| fprintf (st, "MOD IB units could handle about 96 million characters.\n"); | |
| fprintf (st, "MOD IB units operated at half the speed of MOD I units.\n"); | |
| fprintf (st, "ESU units can be added to a system after it has been booted,\n"); | |
| fprintf (st, "however they can't be removed. The configuration of disks must\n"); | |
| fprintf (st, "be the same each time the same system is booted.\n"); | |
| fprintf (st, "To use larger slower drives do:\n"); | |
| fprintf (st, " sim> SET ESUn MODIB before the unit is attached\n"); | |
| fprintf (st, "To use smaller faster drives do (default):\n"); | |
| fprintf (st, " sim> SET ESUn MODI before the unit is attached\n\n"); | |
| fprint_set_help (st, dptr) ; | |
| fprint_show_help (st, dptr) ; | |
| return SCPE_OK; | |
| } | |
| const char * | |
| esu_description (DEVICE *dptr) | |
| { | |
| return "B471 electrontics unit and 5 B457 storage units."; | |
| } | |
| #endif | |