| /* i1620_pt.c: IBM 1621/1624 paper tape reader/punch simulator | |
| Copyright (c) 2002-2008, Robert M Supnik | |
| 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 | |
| ROBERT M SUPNIK 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. | |
| Except as contained in this notice, the name of Robert M Supnik shall not be | |
| used in advertising or otherwise to promote the sale, use or other dealings | |
| in this Software without prior written authorization from Robert M Supnik. | |
| ptr 1621 paper tape reader | |
| ptp 1624 paper tape punch | |
| 21-Sep-05 RMS Revised translation tables for 7094/1401 compatibility | |
| 25-Apr-03 RMS Revised for extended file support | |
| */ | |
| #include "i1620_defs.h" | |
| #define PT_EL 0x80 /* end record */ | |
| #define PT_X 0x40 /* X */ | |
| #define PT_O 0x20 /* O */ | |
| #define PT_C 0x10 /* C */ | |
| #define PT_FD 0x7F /* deleted */ | |
| extern uint8 M[MAXMEMSIZE]; | |
| extern uint8 ind[NUM_IND]; | |
| extern UNIT cpu_unit; | |
| extern uint32 io_stop; | |
| t_stat ptr_reset (DEVICE *dptr); | |
| t_stat ptr_boot (int32 unitno, DEVICE *dptr); | |
| t_stat ptr_read (uint8 *c, t_bool ignfeed); | |
| t_stat ptp_reset (DEVICE *dptr); | |
| t_stat ptp_write (uint32 c); | |
| t_stat ptp_num (uint32 pa, uint32 len); | |
| /* PTR data structures | |
| ptr_dev PTR device descriptor | |
| ptr_unit PTR unit descriptor | |
| ptr_reg PTR register list | |
| */ | |
| UNIT ptr_unit = { | |
| UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE+UNIT_ROABLE, 0) | |
| }; | |
| REG ptr_reg[] = { | |
| { DRDATA (POS, ptr_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { NULL } | |
| }; | |
| DEVICE ptr_dev = { | |
| "PTR", &ptr_unit, ptr_reg, NULL, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &ptr_reset, | |
| &ptr_boot, NULL, NULL | |
| }; | |
| /* PTP data structures | |
| ptp_dev PTP device descriptor | |
| ptp_unit PTP unit descriptor | |
| ptp_reg PTP register list | |
| */ | |
| UNIT ptp_unit = { | |
| UDATA (NULL, UNIT_SEQ+UNIT_ATTABLE, 0) | |
| }; | |
| REG ptp_reg[] = { | |
| { DRDATA (POS, ptp_unit.pos, T_ADDR_W), PV_LEFT }, | |
| { NULL } | |
| }; | |
| DEVICE ptp_dev = { | |
| "PTP", &ptp_unit, ptp_reg, NULL, | |
| 1, 10, 31, 1, 8, 8, | |
| NULL, NULL, &ptp_reset, | |
| NULL, NULL, NULL | |
| }; | |
| /* Data tables */ | |
| /* Paper tape reader odd parity chart: 1 = bad, 0 = ok */ | |
| const int8 bad_par[128] = { | |
| 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, /* 00 */ | |
| 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, /* 10 */ | |
| 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, /* 20 */ | |
| 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, /* 30 */ | |
| 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0, /* 40 */ | |
| 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, /* 50 */ | |
| 1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1, /* 60 */ | |
| 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0 /* 70 */ | |
| }; | |
| /* Paper tape read (7b) to numeric (one digit) */ | |
| const int8 ptr_to_num[128] = { | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* - */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F, | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* C */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F, | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* O */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F, | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* OC */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F, | |
| 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* X */ | |
| 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x10, 0x1E, 0x1F, | |
| 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* XC */ | |
| 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x10, 0x1E, 0x1F, | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* XO */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F, | |
| 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* XOC */ | |
| 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x00, 0x0E, 0x0F | |
| }; | |
| /* Paper tape read (7b) to alphameric (two digits) | |
| Codes XO82, 82, XO842, 842 do not have consistent translations | |
| */ | |
| const int8 ptr_to_alp[128] = { | |
| 0x00, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* - */ | |
| 0x78, 0x79, -1, 0x33, 0x34, 0x70, -1, 0x0F, | |
| 0x00, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* C */ | |
| 0x78, 0x79, -1, 0x33, 0x34, 0x70, -1, 0x0F, | |
| 0x70, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* O */ | |
| 0x68, 0x69, 0x0A, 0x23, 0x24, 0x60, 0x0E, 0x0F, | |
| 0x70, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* OC */ | |
| 0x68, 0x69, 0x0A, 0x23, 0x24, 0x60, 0x0E, 0x0F, | |
| 0x20, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* X */ | |
| 0x58, 0x59, 0x5A, 0x13, 0x14, 0x50, 0x5E, 0x5F, | |
| 0x20, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* XC */ | |
| 0x58, 0x59, 0x5A, 0x13, 0x14, 0x50, 0x5E, 0x5F, | |
| 0x10, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* XO */ | |
| 0x48, 0x49, -1, 0x03, 0x04, 0x40, -1, 0x7F, | |
| 0x10, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* XOC */ | |
| 0x48, 0x49, -1, 0x03, 0x04, 0x40, -1, 0x7F | |
| }; | |
| /* Numeric (flag + digit) to paper tape punch */ | |
| const int8 num_to_ptp[32] = { | |
| 0x20, 0x01, 0x02, 0x13, 0x04, 0x15, 0x16, 0x07, /* 0 */ | |
| 0x08, 0x19, 0x2A, 0x3B, 0x1C, 0x0D, 0x3E, 0x3F, | |
| 0x40, 0x51, 0x52, 0x43, 0x54, 0x45, 0x46, 0x57, /* F + 0 */ | |
| 0x58, 0x49, 0x4A, 0x5B, 0x4C, 0x5D, 0x5E, 0x4F | |
| }; | |
| /* Alphameric (two digits) to paper tape punch */ | |
| const int8 alp_to_ptp[256] = { | |
| 0x10, -1, 0x7A, 0x6B, 0x7C, -1, -1, 0x7F, /* 00 */ | |
| -1, -1, 0x2A, -1, -1, -1, -1, 0x1F, | |
| 0x70, -1, 0x4A, 0x5B, 0x4C, -1, -1, -1, /* 10 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| 0x40, 0x31, 0x2A, 0x3B, 0x2C, -1, -1, -1, /* 20 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, 0x1A, 0x0B, 0x1C, 0x0D, 0x0E, -1, /* 30 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, 0x61, 0x62, 0x73, 0x64, 0x75, 0x76, 0x67, /* 40 */ | |
| 0x68, 0x79, -1, -1, -1, -1, -1, -1, | |
| 0x40, 0x51, 0x52, 0x43, 0x54, 0x45, 0x46, 0x57, /* 50 */ | |
| 0x58, 0x49, 0x4A, -1, -1, -1, -1, 0x4F, | |
| -1, 0x31, 0x32, 0x23, 0x34, 0x25, 0x26, 0x37, /* 60 */ | |
| 0x38, 0x29, -1, -1, -1, -1, -1, -1, | |
| 0x20, 0x01, 0x02, 0x13, 0x04, 0x15, 0x16, 0x07, /* 70 */ | |
| 0x08, 0x19, 0x7A, -1, -1, -1, -1, 0x7F, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* 80 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* 90 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* A0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* B0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* C0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* D0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* E0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1, | |
| -1, -1, -1, -1, -1, -1, -1, -1, /* F0 */ | |
| -1, -1, -1, -1, -1, -1, -1, -1 | |
| }; | |
| /* Paper tape reader IO routine | |
| - Hard errors halt the operation and the system. | |
| - Parity errors place an invalid character in memory and set | |
| RDCHK, but the read continues until end of record. If IO | |
| stop is set, the system then halts. | |
| */ | |
| t_stat ptr (uint32 op, uint32 pa, uint32 f0, uint32 f1) | |
| { | |
| uint32 i; | |
| int8 mc; | |
| uint8 ptc; | |
| t_stat r, sta; | |
| sta = SCPE_OK; | |
| switch (op) { /* case on op */ | |
| case OP_RN: /* read numeric */ | |
| for (i = 0; i < MEMSIZE; i++) { /* (stop runaway) */ | |
| r = ptr_read (&ptc, TRUE); /* read frame */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| if (ptc & PT_EL) { /* end record? */ | |
| M[pa] = REC_MARK; /* store rec mark */ | |
| return sta; /* done */ | |
| } | |
| if (bad_par[ptc]) { /* bad parity? */ | |
| ind[IN_RDCHK] = 1; /* set read check */ | |
| if (io_stop) /* set return status */ | |
| sta = STOP_INVCHR; | |
| M[pa] = 0; /* store zero */ | |
| } | |
| else M[pa] = ptr_to_num[ptc]; /* translate, store */ | |
| PP (pa); /* incr mem addr */ | |
| } | |
| break; | |
| case OP_RA: /* read alphameric */ | |
| for (i = 0; i < MEMSIZE; i = i + 2) { /* (stop runaway) */ | |
| r = ptr_read (&ptc, TRUE); /* read frame */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| if (ptc & PT_EL) { /* end record? */ | |
| M[pa] = REC_MARK; /* store rec mark */ | |
| M[pa - 1] = 0; | |
| return sta; /* done */ | |
| } | |
| mc = ptr_to_alp[ptc]; /* translate */ | |
| if (bad_par[ptc] || (mc < 0)) { /* bad par or char? */ | |
| ind[IN_RDCHK] = 1; /* set read check */ | |
| if (io_stop) /* set return status */ | |
| sta = STOP_INVCHR; | |
| mc = 0; /* store blank */ | |
| } | |
| M[pa] = (M[pa] & FLAG) | (mc & DIGIT); /* store 2 digits */ | |
| M[pa - 1] = (M[pa - 1] & FLAG) | ((mc >> 4) & DIGIT); | |
| pa = ADDR_A (pa, 2); /* incr mem addr */ | |
| } | |
| break; | |
| default: /* invalid function */ | |
| return STOP_INVFNC; | |
| } | |
| return STOP_RWRAP; | |
| } | |
| /* Binary paper tape reader IO routine - see above for error handling */ | |
| t_stat btr (uint32 op, uint32 pa, uint32 f0, uint32 f1) | |
| { | |
| uint32 i; | |
| uint8 ptc; | |
| t_stat r, sta; | |
| if ((cpu_unit.flags & IF_BIN) == 0) | |
| return STOP_INVIO; | |
| sta = SCPE_OK; | |
| switch (op) { /* case on op */ | |
| case OP_RA: /* read alphameric */ | |
| for (i = 0; i < MEMSIZE; i = i + 2) { /* (stop runaway) */ | |
| r = ptr_read (&ptc, FALSE); /* read frame */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| if (ptc & PT_EL) { /* end record? */ | |
| M[pa] = REC_MARK; /* store rec mark */ | |
| M[pa - 1] = 0; | |
| return sta; /* done */ | |
| } | |
| if (bad_par[ptc]) { /* bad parity? */ | |
| ind[IN_RDCHK] = 1; /* set read check */ | |
| if (io_stop) /* set return status */ | |
| sta = STOP_INVCHR; | |
| } | |
| M[pa] = (M[pa] & FLAG) | (ptc & 07); /* store 2 digits */ | |
| M[pa - 1] = (M[pa - 1] & FLAG) | | |
| (((ptc >> 5) & 06) | ((ptc >> 3) & 1)); | |
| pa = ADDR_A (pa, 2); /* incr mem addr */ | |
| } | |
| break; | |
| default: /* invalid function */ | |
| return STOP_INVFNC; | |
| } | |
| return STOP_RWRAP; | |
| } | |
| /* Read ptr frame - all errors are 'hard' errors and halt the system */ | |
| t_stat ptr_read (uint8 *c, t_bool ignfeed) | |
| { | |
| int32 temp; | |
| if ((ptr_unit.flags & UNIT_ATT) == 0) { /* attached? */ | |
| ind[IN_RDCHK] = 1; /* no, error */ | |
| return SCPE_UNATT; | |
| } | |
| do { | |
| if ((temp = getc (ptr_unit.fileref)) == EOF) { /* read char */ | |
| ind[IN_RDCHK] = 1; /* err, rd chk */ | |
| if (feof (ptr_unit.fileref)) | |
| printf ("PTR end of file\n"); | |
| else perror ("PTR I/O error"); | |
| clearerr (ptr_unit.fileref); | |
| return SCPE_IOERR; | |
| } | |
| *c = temp & 0377; /* save char */ | |
| ptr_unit.pos = ptr_unit.pos + 1; /* incr file addr */ | |
| } while (ignfeed && (*c == PT_FD)); /* until not feed */ | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat ptr_reset (DEVICE *dptr) | |
| { | |
| return SCPE_OK; | |
| } | |
| /* Bootstrap routine */ | |
| const static uint8 boot_rom[] = { | |
| 4, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* NOP */ | |
| 3, 6, 0, 0, 0, 3, 1, 0, 0, 3, 0, 0, /* RNPT 31 */ | |
| 2, 5, 0, 0, 0, 7, 1, 0, 0, 0, 0, 0, /* TD 71,loc */ | |
| 3, 6, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, /* RNPT loc1 */ | |
| 2, 6, 0, 0, 0, 6, 6, 0, 0, 0, 3, 5, /* TF 66,35 */ | |
| 1, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* TDM loc2,loc3 */ | |
| 4, 9, 0, 0, 0, 1, 2, 0, 0, 0, 0, 0 /* BR 12 */ | |
| }; | |
| #define BOOT_START 0 | |
| #define BOOT_LEN (sizeof (boot_rom) / sizeof (uint8)) | |
| t_stat ptr_boot (int32 unitno, DEVICE *dptr) | |
| { | |
| int32 i; | |
| extern int32 saved_PC; | |
| for (i = 0; i < BOOT_LEN; i++) | |
| M[BOOT_START + i] = boot_rom[i]; | |
| saved_PC = BOOT_START; | |
| return SCPE_OK; | |
| } | |
| /* Paper tape punch IO routine | |
| - Hard errors halt the operation and the system. | |
| - Parity errors stop the operation and set WRCHK. | |
| If IO stop is set, the system then halts. | |
| */ | |
| t_stat ptp (uint32 op, uint32 pa, uint32 f0, uint32 f1) | |
| { | |
| uint32 i; | |
| int8 ptc; | |
| uint8 z, d; | |
| t_stat r; | |
| switch (op) { /* decode op */ | |
| case OP_DN: | |
| return ptp_num (pa, 20000 - (pa % 20000)); /* dump numeric */ | |
| case OP_WN: | |
| return ptp_num (pa, 0); /* punch numeric */ | |
| case OP_WA: | |
| for (i = 0; i < MEMSIZE; i = i + 2) { /* stop runaway */ | |
| d = M[pa] & DIGIT; /* get digit */ | |
| z = M[pa - 1] & DIGIT; /* get zone */ | |
| if ((d & REC_MARK) == REC_MARK) /* 8-2 char? */ | |
| return ptp_write (PT_EL); /* end record */ | |
| ptc = alp_to_ptp[(z << 4) | d]; /* translate pair */ | |
| if (ptc < 0) { /* bad char? */ | |
| ind[IN_WRCHK] = 1; /* write check */ | |
| CRETIOE (io_stop, STOP_INVCHR); | |
| } | |
| r = ptp_write (ptc); /* write char */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| pa = ADDR_A (pa, 2); /* incr mem addr */ | |
| } | |
| break; | |
| default: /* invalid function */ | |
| return STOP_INVFNC; | |
| } | |
| return STOP_RWRAP; | |
| } | |
| /* Binary paper tape punch IO routine - see above for error handling */ | |
| t_stat btp (uint32 op, uint32 pa, uint32 f0, uint32 f1) | |
| { | |
| uint32 i; | |
| uint8 ptc, z, d; | |
| t_stat r; | |
| if ((cpu_unit.flags & IF_BIN) == 0) return STOP_INVIO; | |
| switch (op) { /* decode op */ | |
| case OP_WA: | |
| for (i = 0; i < MEMSIZE; i = i + 2) { /* stop runaway */ | |
| d = M[pa] & DIGIT; /* get digit */ | |
| z = M[pa - 1] & DIGIT; /* get zone */ | |
| if ((d & REC_MARK) == REC_MARK) /* 8-2 char? */ | |
| return ptp_write (PT_EL); /* end record */ | |
| ptc = ((z & 06) << 5) | ((z & 01) << 3) | (d & 07); | |
| if (bad_par[ptc]) /* set parity */ | |
| ptc = ptc | PT_C; | |
| r = ptp_write (ptc); /* write char */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| pa = ADDR_A (pa, 2); /* incr mem addr */ | |
| } | |
| break; | |
| default: /* invalid function */ | |
| return STOP_INVFNC; | |
| } | |
| return STOP_RWRAP; | |
| } | |
| /* Punch tape numeric - cannot generate parity errors */ | |
| t_stat ptp_num (uint32 pa, uint32 len) | |
| { | |
| t_stat r; | |
| uint8 d; | |
| uint32 i, end; | |
| end = pa + len; | |
| for (i = 0; i < MEMSIZE; i++) { /* stop runaway */ | |
| d = M[pa] & (FLAG | DIGIT); /* get char */ | |
| if (len? (pa >= end): /* dump: end reached? */ | |
| ((d & REC_MARK) == REC_MARK)) /* write: rec mark? */ | |
| return ptp_write (PT_EL); /* end record */ | |
| r = ptp_write (num_to_ptp[d]); /* write */ | |
| if (r != SCPE_OK) /* error? */ | |
| return r; | |
| PP (pa); /* incr mem addr */ | |
| } | |
| return STOP_RWRAP; | |
| } | |
| /* Write ptp frame - all errors are hard errors */ | |
| t_stat ptp_write (uint32 c) | |
| { | |
| if ((ptp_unit.flags & UNIT_ATT) == 0) { /* attached? */ | |
| ind[IN_WRCHK] = 1; /* no, error */ | |
| return SCPE_UNATT; | |
| } | |
| if (putc (c, ptp_unit.fileref) == EOF) { /* write char */ | |
| ind[IN_WRCHK] = 1; /* error? */ | |
| perror ("PTP I/O error"); | |
| clearerr (ptp_unit.fileref); | |
| return SCPE_IOERR; | |
| } | |
| ptp_unit.pos = ptp_unit.pos + 1; /* count char */ | |
| return SCPE_OK; | |
| } | |
| /* Reset routine */ | |
| t_stat ptp_reset (DEVICE *dptr) | |
| { | |
| return SCPE_OK; | |
| } |