| /* ioc-cont.c: Intel IPC DBB adapter |
| |
| Copyright (c) 2010, William A. Beech |
| |
| 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 |
| WILLIAM A. BEECH 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 William A. Beech shall not be |
| used in advertising or otherwise to promote the sale, use or other dealings |
| in this Software without prior written authorization from William A. Beech. |
| |
| MODIFICATIONS: |
| |
| 27 Jun 16 - Original file. |
| |
| NOTES: |
| |
| |
| */ |
| |
| #include "system_defs.h" /* system header in system dir */ |
| |
| #define DEBUG 0 |
| |
| //dbb status flag bits |
| #define OBF 1 |
| #define IBF 2 |
| #define F0 4 |
| #define CD 8 |
| |
| //dbb command codes |
| #define PACIFY 0x00 //Resets IOC and its devices |
| #define ERESET 0x01 //Resets device-generated error (not used by standard devices) |
| #define SYSTAT 0x02 //Returns subsystem status byte to master |
| #define DSTAT 0x03 //Returns device status byte to master |
| #define SRQDAK 0x04 //Enables input of device interrupt acknowledge mask from master |
| #define SRQACK 0x05 //Clears IOC subsystem interrupt request |
| #define SRQ 0x06 //Tests ability of IOC to forward an interrupt request to the master |
| #define DECHO 0x07 //Tests ability of IOC to echo data byte sent by master |
| #define CSMEM 0x08 //Requests IOC to checksum on-board ROM. Returns pass/fail |
| #define TRAM 0x09 //Requests IOC to test on-board RAM. Returns pass/fail |
| #define SINT 0x0A //Enables specified device interrupt from IOC |
| #define CRTC 0x10 //Requests data byte output to the CRT monitor |
| #define CRTS 0x11 //Returns CRT status byte to master |
| #define KEYC 0x12 //Requests data byte input from the keyboard |
| #define KSTC 0x13 //Returns keyboard status byte to master |
| #define WPBC 0x15 //Enables input of first of five bytes that define current diskette operation |
| #define WPBCC 0x16 //Enables input of each of four bytes that follow WPBC |
| #define WDBC 0x17 //Enables input of diskette write bytes from master |
| #define RDBC 0x19 //Enables output of diskette read bytes to master |
| #define RRSTS 0x1B //Returns diskette result byte to master |
| #define RDSTS 0x1C //Returns diskette device status byte to master |
| |
| /* external globals */ |
| |
| extern uint16 port; //port called in dev_table[port] |
| extern int32 PCX; |
| |
| /* function prototypes */ |
| |
| uint8 ioc_cont0(t_bool io, uint8 data); /* ioc_cont*/ |
| uint8 ioc_cont1(t_bool io, uint8 data); /* ioc_cont*/ |
| t_stat ioc_cont_reset (DEVICE *dptr, uint16 baseport); |
| |
| /* external function prototypes */ |
| |
| extern uint16 reg_dev(uint8 (*routine)(t_bool, uint8), uint16, uint8); |
| extern uint32 saved_PC; /* program counter */ |
| |
| /* globals */ |
| |
| uint8 dbb_stat; |
| uint8 dbb_cmd; |
| uint8 dbb_in; |
| uint8 dbb_out; |
| |
| UNIT ioc_cont_unit[] = { |
| { UDATA (0, 0, 0) }, /* ioc_cont*/ |
| }; |
| |
| REG ioc_cont_reg[] = { |
| { HRDATA (CONTROL0, ioc_cont_unit[0].u3, 8) }, /* ioc_cont */ |
| { NULL } |
| }; |
| |
| DEBTAB ioc_cont_debug[] = { |
| { "ALL", DEBUG_all }, |
| { "FLOW", DEBUG_flow }, |
| { "READ", DEBUG_read }, |
| { "WRITE", DEBUG_write }, |
| { "XACK", DEBUG_xack }, |
| { "LEV1", DEBUG_level1 }, |
| { "LEV2", DEBUG_level2 }, |
| { NULL } |
| }; |
| |
| /* address width is set to 16 bits to use devices in 8086/8088 implementations */ |
| |
| DEVICE ioc_cont_dev = { |
| "IOC-CONT", //name |
| ioc_cont_unit, //units |
| ioc_cont_reg, //registers |
| NULL, //modifiers |
| 1, //numunits |
| 16, //aradix |
| 16, //awidth |
| 1, //aincr |
| 16, //dradix |
| 8, //dwidth |
| NULL, //examine |
| NULL, //deposit |
| // &ioc_cont_reset, //reset |
| NULL, //reset |
| NULL, //boot |
| NULL, //attach |
| NULL, //detach |
| NULL, //ctxt |
| 0, //flags |
| 0, //dctrl |
| ioc_cont_debug, //debflags |
| NULL, //msize |
| NULL //lname |
| }; |
| |
| /* Reset routine */ |
| |
| t_stat ioc_cont_reset(DEVICE *dptr, uint16 baseport) |
| { |
| sim_printf(" ioc_cont[%d]: Reset\n", 0); |
| sim_printf(" ioc_cont[%d]: Registered at %04X\n", 0, baseport); |
| reg_dev(ioc_cont0, baseport, 0); |
| reg_dev(ioc_cont1, baseport + 1, 0); |
| dbb_stat = 0x00; /* clear DBB status */ |
| return SCPE_OK; |
| } |
| |
| /* I/O instruction handlers, called from the CPU module when an |
| IN or OUT instruction is issued. |
| */ |
| |
| /* IOC control port functions */ |
| |
| uint8 ioc_cont0(t_bool io, uint8 data) |
| { |
| if (io == 0) { /* read data port */ |
| if (DEBUG) |
| sim_printf(" ioc_cont0: read data returned %02X PCX=%04X\n", dbb_out, PCX); |
| return dbb_out; |
| } else { /* write data port */ |
| dbb_in = data; |
| dbb_stat |= IBF; |
| if (DEBUG) |
| sim_printf(" ioc_cont0: write data=%02X port=%02X PCX=%04X\n", dbb_in, port, PCX); |
| return 0; |
| } |
| } |
| |
| uint8 ioc_cont1(t_bool io, uint8 data) |
| { |
| int temp; |
| |
| if (io == 0) { /* read status port */ |
| if ((dbb_stat & F0) && (dbb_stat & IBF)) { |
| temp = dbb_stat; |
| if (DEBUG) |
| sim_printf(" ioc_cont1: DBB status read 1 data=%02X PCX=%04X\n", dbb_stat, PCX); |
| dbb_stat &= ~IBF; //reset IBF flag |
| return temp; |
| } |
| if ((dbb_stat & F0) && (dbb_stat & OBF)) { |
| temp = dbb_stat; |
| if (DEBUG) |
| sim_printf(" ioc_cont1: DBB status read 2 data=%02X PCX=%04X\n", dbb_stat, PCX); |
| dbb_stat &= ~OBF; //reset OBF flag |
| return temp; |
| } |
| if (dbb_stat & F0) { |
| temp = dbb_stat; |
| if (DEBUG) |
| sim_printf(" ioc_cont1: DBB status read 3 data=%02X PCX=%04X\n", dbb_stat, PCX); |
| dbb_stat &= ~F0; //reset F0 flag |
| return temp; |
| } |
| // if (DEBUG) |
| // sim_printf(" ioc_cont1: DBB status read 4 data=%02X PCX=%04X\n", dbb_stat, PCX); |
| return dbb_stat; |
| } else { /* write command port */ |
| dbb_cmd = data; |
| switch(dbb_cmd){ |
| case PACIFY: //should delay 100 ms |
| dbb_stat = 0; |
| break; |
| case SYSTAT: |
| dbb_out = 0; |
| dbb_stat |= OBF; |
| dbb_stat &= ~CD; |
| break; |
| case CRTS: |
| dbb_out = 0; |
| dbb_stat |= F0; |
| break; |
| case KSTC: |
| dbb_out = 0; |
| dbb_stat |= F0; |
| break; |
| case RDSTS: |
| dbb_out = 0x80; //not ready |
| dbb_stat |= (F0 | IBF); |
| break; |
| default: |
| sim_printf(" ioc_cont1: Unknown command %02X PCX=%04X\n", dbb_cmd, PCX); |
| } |
| if (DEBUG) |
| sim_printf(" ioc_cont1: DBB command write data=%02X PCX=%04X\n", dbb_cmd, PCX); |
| return 0; |
| } |
| } |
| |
| /* end of ioc-cont.c */ |