65402fbaa1
This summer a group of us worked together to resurrect the original ARPAnet IMP software, and I’m now happy to say that the IMP lives again in simulation. It’s possible to run the original IMP software on a modified version of the H316 simh and to set up a virtual network of simulated IMPs talking to each other. IMP to IMP connections, which would have originally been carried over leased telephone lines, are tunneled over IP. As far as we can tell, everything works pretty much as it did in the early 1970s. IMPs are able to exchange routing information, console to console communications, network statistics, and they would carry host traffic if there were hosts on the network. The hooks are in there to allow simh to support the IMP side of the 1822 host interface, and the next step would be to recover the OS for an ARPAnet era host and then extend the corresponding simulator to talk to the IMP simulation.
357 lines
15 KiB
C
357 lines
15 KiB
C
/* h316_lp.c: Honeywell 316/516 line printer
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Copyright (c) 1999-2008, Robert M. Supnik
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of Robert M Supnik shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from Robert M Supnik.
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lpt line printer
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3-Jul-13 RLA compatibility changes for extended interrupts
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09-Jun-07 RMS Fixed lost last print line (Theo Engel)
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19-Jan-06 RMS Added UNIT_TEXT flag
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03-Apr-06 RMS Fixed bug in blanks backscanning (Theo Engel)
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01-Dec-04 RMS Fixed bug in DMA/DMC support
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24-Oct-03 RMS Added DMA/DMC support
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25-Apr-03 RMS Revised for extended file support
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30-May-02 RMS Widened POS to 32b
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The Series 16 line printer is an unbuffered Analex shuttle printer.
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Because it was unbuffered, the CPU had to scan out an entire line's
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worth of characters (60 words) for every character on the print drum
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(64 characters). Because it was a shuttle printer, the entire
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process must be repeated first for the odd columns and then for the
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even columns. After scanning the odd columns, the printer carriage
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shuttled right by one column; after scanning the even columns, the
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carriage shuttled left. This halved the number of hammers required,
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reducing cost but increasing mechanical complexity.
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The real printer is very timing dependent. If the CPU misses a
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scan, then the wrong characters are printed. If the printer protocol
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is violated, then results are unpredictable. The simulated printer
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is much more forgiving. Rather than simulating the fixed drum and
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hammer timing of the real printer, the simulator is driven by the
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program's OTA instructions. If the program misses a time slot, the
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simulator will still print the "correct" result. A timing based
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simulation would be very hard to do in the absense of accurate
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instruction timing.
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Printer state is maintained in a set of position and state variables:
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lpt_wdpos word count within a line scan (0-59)
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lpt_drpos drum position (0-63)
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lpt_crpos carriage position (0-1)
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lpt_svcst service state (shuttle, paper advance)
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lpt_svcch channel for paper advance (0 = no adv)
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lpt_rdy transfer ready flag
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lpt_prdn printing done flag
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lpt_dma use DMA/DMC
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lpt_eor DMA/DMC end of range
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*/
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#include "h316_defs.h"
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#define LPT_WIDTH 120 /* width */
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#define LPT_SCAN (LPT_WIDTH / 2) /* words/scan */
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#define LPT_DRUM 64 /* drum rows */
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#define LPT_SVCSH 01 /* shuttle */
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#define LPT_SVCPA 02 /* paper advance */
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extern int32 dev_int, dev_enb;
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extern int32 stop_inst;
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extern uint32 chan_req;
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int32 lpt_wdpos = 0; /* word position */
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int32 lpt_drpos = 0; /* drum position */
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int32 lpt_crpos = 0; /* carriage position */
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int32 lpt_svcst = 0; /* service state */
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int32 lpt_svcch = 0; /* service channel */
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int32 lpt_rdy = 0; /* transfer flag */
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int32 lpt_prdn = 1; /* printing done */
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int32 lpt_dma = 0; /* use DMA/DMC */
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int32 lpt_eor = 0; /* DMA/DMC end range */
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char lpt_buf[LPT_WIDTH + 1] = { 0 }; /* line buffer */
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int32 lpt_xtime = 5; /* transfer time */
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int32 lpt_etime = 50; /* end of scan time */
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int32 lpt_ptime = 5000; /* paper adv time */
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int32 lpt_stopioe = 0; /* stop on error */
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int32 lptio (int32 inst, int32 fnc, int32 dat, int32 dev);
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t_stat lpt_svc (UNIT *uptr);
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t_stat lpt_reset (DEVICE *dptr);
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/* LPT data structures
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lpt_dev LPT device descriptor
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lpt_unit LPT unit descriptor
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lpt_mod LPT modifiers
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lpt_reg LPT register list
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*/
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DIB lpt_dib = { LPT, 1, IOBUS, IOBUS, INT_V_LPT, INT_V_NONE, &lptio, 0 };
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UNIT lpt_unit = { UDATA (&lpt_svc, UNIT_SEQ+UNIT_ATTABLE+UNIT_TEXT, 0) };
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REG lpt_reg[] = {
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{ DRDATA (WDPOS, lpt_wdpos, 6) },
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{ DRDATA (DRPOS, lpt_drpos, 6) },
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{ FLDATA (CRPOS, lpt_crpos, 0) },
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{ FLDATA (RDY, lpt_rdy, 0) },
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{ FLDATA (EOR, lpt_eor, 0) },
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{ FLDATA (DMA, lpt_dma, 0) },
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{ FLDATA (PRDN, lpt_prdn, 0) },
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{ FLDATA (INTREQ, dev_int, INT_V_LPT) },
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{ FLDATA (ENABLE, dev_enb, INT_V_LPT) },
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{ ORDATA (SVCST, lpt_svcst, 2) },
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{ ORDATA (SVCCH, lpt_svcch, 2) },
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{ BRDATA (BUF, lpt_buf, 8, 8, 120) },
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{ DRDATA (POS, lpt_unit.pos, T_ADDR_W), PV_LEFT },
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{ DRDATA (XTIME, lpt_xtime, 24), PV_LEFT },
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{ DRDATA (ETIME, lpt_etime, 24), PV_LEFT },
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{ DRDATA (PTIME, lpt_ptime, 24), PV_LEFT },
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{ FLDATA (STOP_IOE, lpt_stopioe, 0) },
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{ NULL }
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};
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DEVICE lpt_dev = {
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"LPT", &lpt_unit, lpt_reg, NULL,
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1, 10, 31, 1, 8, 8,
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NULL, NULL, &lpt_reset,
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NULL, NULL, NULL,
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&lpt_dib, DEV_DISABLE
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};
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/* IO routine */
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int32 lptio (int32 inst, int32 fnc, int32 dat, int32 dev)
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{
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int32 ch = lpt_dib.chan - 1; /* DMA/DMC chan */
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int32 chr;
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switch (inst) { /* case on opcode */
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case ioOCP: /* OCP */
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switch (fnc) { /* case on fnc */
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case 000: case 002: case 004: /* paper adv */
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lpt_svcst = lpt_svcst | LPT_SVCPA; /* set state */
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lpt_svcch = fnc >> 1; /* save channel */
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sim_activate (&lpt_unit, lpt_ptime);
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CLR_INT (INT_LPT); /* clear int */
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break;
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case 003: /* init scan DMA/DMC */
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lpt_prdn = 0; /* clear pr done */
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lpt_wdpos = 0; /* init scan pos */
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lpt_eor = 0;
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if (ch >= 0) /* try for DMA/DMC */
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lpt_dma = 1;
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else lpt_dma = 0;
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if (!sim_is_active (&lpt_unit)) {
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lpt_rdy = 1;
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if (lpt_dma)
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SET_CH_REQ (ch);
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}
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CLR_INT (INT_LPT); /* clear int */
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break;
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case 007: /* init scan IO bus */
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lpt_prdn = 0; /* clear pr done */
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lpt_wdpos = 0; /* init scan pos */
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lpt_eor = 0;
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lpt_dma = 0; /* IO bus */
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if (!sim_is_active (&lpt_unit))
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lpt_rdy = 1;
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CLR_INT (INT_LPT); /* clear int */
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break;
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default:
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return IOBADFNC (dat);
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}
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break;
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case ioSKS: /* SKS */
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switch (fnc) { /* case on fnc */
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case 000: /* if xfer rdy */
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if (lpt_rdy)
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return IOSKIP (dat);
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break;
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case 002: /* if !alarm */
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if (lpt_unit.flags & UNIT_ATT)
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return IOSKIP (dat);
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break;
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case 003: /* if odd col */
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if (lpt_crpos)
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return IOSKIP (dat);
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break;
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case 004: /* if !interrupt */
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if (!TST_INTREQ (INT_LPT))
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return IOSKIP (dat);
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break;
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case 011: /* if line printed */
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if (lpt_prdn)
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return IOSKIP (dat);
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break;
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case 012: /* if !shuttling */
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if (!(lpt_svcst & LPT_SVCSH))
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return IOSKIP (dat);
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break;
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case 013:
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if (lpt_prdn && !(lpt_svcst & LPT_SVCSH))
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return IOSKIP (dat);
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break;
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case 014: /* if !advancing */
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if (!(lpt_svcst & LPT_SVCPA))
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return IOSKIP (dat);
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break;
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case 015:
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if (lpt_prdn && !(lpt_svcst & LPT_SVCPA))
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return IOSKIP (dat);
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break;
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case 016:
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if (!(lpt_svcst & (LPT_SVCSH | LPT_SVCPA)))
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return IOSKIP (dat);
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break;
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case 017:
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if (lpt_prdn && !(lpt_svcst & (LPT_SVCSH | LPT_SVCPA)))
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return IOSKIP (dat);
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break;
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default:
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return IOBADFNC (dat);
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}
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break;
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case ioOTA: /* OTA */
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if (fnc) /* only fnc 0 */
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return IOBADFNC (dat);
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if (lpt_rdy) { /* xfer ready? */
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lpt_rdy = 0; /* clear xfer */
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chr = (dat >> (lpt_crpos? 0: 8)) & 077; /* get 6b char */
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if (chr == lpt_drpos) { /* match drum pos? */
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if (chr < 040)
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chr = chr | 0100;
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lpt_buf[2 * lpt_wdpos + lpt_crpos] = chr;
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}
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lpt_wdpos++; /* adv scan pos */
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if (lpt_wdpos >= LPT_SCAN) { /* end of scan? */
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lpt_wdpos = 0; /* reset scan pos */
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lpt_drpos++; /* adv drum pos */
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if (lpt_drpos >= LPT_DRUM) { /* end of drum? */
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lpt_drpos = 0; /* reset drum pos */
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lpt_crpos = lpt_crpos ^ 1; /* shuttle */
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lpt_svcst = lpt_svcst | LPT_SVCSH;
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sim_activate (&lpt_unit, lpt_ptime);
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} /* end if shuttle */
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else sim_activate (&lpt_unit, lpt_etime);
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} /* end if endscan */
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else sim_activate (&lpt_unit, lpt_xtime);
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return IOSKIP (dat); /* skip return */
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}
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break;
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case ioEND: /* end DMA/DMC */
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lpt_eor = 1; /* set end range */
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break;
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} /* end case op */
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return dat;
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}
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/* Unit service */
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t_stat lpt_svc (UNIT *uptr)
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{
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int32 i;
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int32 ch = lpt_dib.chan - 1; /* DMA/DMC chan */
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static const char *lpt_cc[] = {
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"\r",
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"\n",
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"\n\f",
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"\n"
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};
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if ((lpt_unit.flags & UNIT_ATT) == 0) /* attached? */
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return IORETURN (lpt_stopioe, SCPE_UNATT);
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if (lpt_dma) { /* DMA/DMC? */
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if (lpt_eor) /* end range? intr */
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SET_INT (INT_LPT);
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else {
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lpt_rdy = 1; /* set ready */
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SET_CH_REQ (ch); /* get more data */
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}
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}
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else lpt_rdy = 1; /* IO, continue scan */
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if (lpt_svcst & LPT_SVCSH) { /* shuttling? */
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SET_INT (INT_LPT); /* interrupt */
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if (lpt_crpos == 0) { /* done shuttling? */
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for (i = LPT_WIDTH - 1; i >= 0; i--) { /* backscan for blanks */
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if (lpt_buf[i] != ' ')
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break;
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}
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lpt_buf[i + 1] = 0;
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fputs (lpt_buf, uptr->fileref); /* output buf */
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uptr->pos = ftell (uptr->fileref); /* update pos */
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for (i = 0; i < LPT_WIDTH; i++) /* clear buf */
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lpt_buf[i] = ' ';
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lpt_prdn = 1; /* print done */
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}
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}
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if (lpt_svcst & LPT_SVCPA) { /* paper advance */
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SET_INT (INT_LPT); /* interrupt */
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fputs (lpt_cc[lpt_svcch & 03], uptr->fileref); /* output eol */
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uptr->pos = ftell (uptr->fileref); /* update pos */
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}
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lpt_svcst = 0;
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return SCPE_OK;
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}
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/* Reset routine */
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t_stat lpt_reset (DEVICE *dptr)
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{
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int32 i;
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lpt_wdpos = lpt_drpos = lpt_crpos = 0; /* clear positions */
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lpt_svcst = lpt_svcch = 0; /* idle state */
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lpt_rdy = 0; /* not rdy to xfer */
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lpt_prdn = 1; /* printing done */
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lpt_eor = 0;
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lpt_dma = 0;
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for (i = 0; i < LPT_WIDTH; i++) /* clear buffer */
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lpt_buf[i] = ' ';
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lpt_buf[LPT_WIDTH] = 0;
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CLR_INT (INT_LPT); /* clear int, enb */
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CLR_ENB (INT_LPT);
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sim_cancel (&lpt_unit); /* deactivate unit */
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return SCPE_OK;
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}
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